| Thermomechanical Effects in Metal Field Emitter Structures |
22 MAR 96 |
12 pages |
| Authors:
M. G. Ancona; NAVAL RESEARCH LAB WASHINGTON DC
|
 | Analytical and numerical results concerning thermal and mechanical effects in operating metal field emitter structures (tips, gates and anodes) are summarized. For the most part, it is found that such effects are too small to constitute a reliability threat unless the geometries (via their effect on heat sinking) or the operating frequencies (via their ac heating contribution) are extreme. For ideal structures of conventional (SRI-like) geometry under normal operating conditions ... |
|
| Heat Transfer Studies and Flow Visualization of a Rectangular Channel with an Offset-Plate-Fin Array |
MAR 96 |
136 pages |
| Authors:
Carlos M. Suarez; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The heat transfer characteristics and flow visualization of a 10X scale version of internal offset-fin plate array within the liquid flow-through module for electronics cooling were investigated experimentally using water as a cooling fluid. By varying power input settings and coolant flow rates, the heat transfer effect, from the plate array to the coolant water was investigated. Additionally thermochronic liquid crystals were spray-painted onto the plate to determine the temperature ... |
|
| Startup of the Liquid-Metal Heat Pipe in Aerodynamic Heating Environments |
FEB 96 |
51 pages |
| Authors:
Won S. Chang; WRIGHT LAB WRIGHT-PATTERSON AFB OH
|
| As part of a US Army missile development program, liquid-metal heat pipes have been investigated to remove the high heat flux associated with the missile fins being located in hot exhaust gas paths. Using steady-state and transient analyses, a solution method has been developed to identify the required length of the condenser for a design operation when the heat pipe is coupled with aerodynamic heating and cooling environments. A simple ... |
|
| Climate and Work Load Both Interact with Individual Characteristics in Determining the Human Heat Stress Response (Klimaat en Werkbelasting Beinvloeden Beide de Individuele Karakteristieken bij het Bepalen van de Menselijke Reactie op Hittebelasting) |
08 DEC 95 |
|
| Authors:
G. Havenith; J. M. Coenen; J. A. Kistemaker; HUMAN FACTORS RESEARCH INST TNO SOESTERBERG (NETHERLANDS)
|
 | Heat exposure data from comparable heterogeneous subject groups (Large variations in VO(2max), mass, body surface area (A%), fat content, A(du)/ mass ratio) who worked on a cycle ergometer at a Load relative to their V0(2max) (RL) in a cool (CO; 2l deg C, 50%rh), warm humid (WH; 35 deg C, 80%) and a hot dry (HD; 45 deg C, 20%) environment (n=24) or who worked at a fixed toad (FL; ... |
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| Vehicle Thermal Control with a Variable Area Inlet |
DEC 95 |
109 pages |
| Authors:
Thomas R. Layne; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| This study developed a variable area inlet and controller that regulated the temperature of an electrical component with ram air. The intent of the variable area inlet was to reduce vehicle drag by eliminating inefficiencies associated with component cooling and fixed area inlets. These inefficiencies arise from vehicles moving at varying speeds through varying air temperatures. The hardware model consisted of an electrical component mounted inside a right- circular cylindrical ... |
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| Graphite/Epoxy Heat Sink/Mounting for Common Pressure Vessel. |
21 NOV 1995 |
|
| Authors:
Nelson L. Hyman; William R. Braun; James C. Garner; Lawrence R. Larson; Sheleen M. Tuner; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| The graphite-epoxy heat sink and mounting structure is comprised of a mounting structure constructed of a graphite-epoxy material that is mounted around a heat generating pressure vessel located inside a spacecraft. The mounting structure is a graphite-epoxy structure having three segments. The first and third segments are a graphite-epoxy material with a high thermal conductivity but not necessarily capable of withstanding structural stresses. Between these thermal conductive segments is a ... |
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| Effect of Fuel Composition and Prestressing on Lubricity |
AUG 95 |
67 pages |
| Authors:
P. I. Lacey; S. R. Westbrook; SOUTHWEST RESEARCH INST SAN ANTONIO TX TARDEC FUELS AND LUBRICANTS RESEARCH F ACILITY
|
| Fuel lubricity--or the ability of the fuel to prevent wear during sliding-is sensitive to chemical composition. At present, increasingly severe fuel specifications are being implemented to minimize exhaust emissions. The refinery processes needed to achieve these goals are inadvertently removing many of the surface-active components necessary for wear resistance. To compound this effect, engine operating conditions are becoming more severe; fuel injection pressures are increasing dramatically, while uncooled engines that ... |
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| Finite Difference-Time Domain Analysis of Electromagnetic Interference and Radiation Problems |
JUN 1995 |
265 pages |
| Authors:
Kevin Li; AIR FORCE RESEARCH LAB BOLLING AFB DC
|
| The application of the finite difference-time domain (FD-TD) technique to problems in electromagnetic interference and radiation is examined, and enhancements to the method in order to increase its accuracy and efficiency are considered. The primary motivation for studying electromagnetic radiation from various structures which compose a computer is that computers are now operating at faster speeds (i.e. 100's of MHz) and consuming more power resulting in significantly increased levels of ... |
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| High Pressure Earth Storable Rocket Technology Program. Basic Program |
MAR 95 |
78 pages |
| Authors:
M. L. Chazen; D. Sicher; D. Huang; T. Mueller; TRW SPACE AND TECHNOLOGY GROUP REDONDO BEACH CA
|
| The HIPES Program was conducted for NASA-LeRC by TRW. The Basic Program consisted of system studies, design of testbed engine, fabrication and testing of engine. Studies of both pressure-fed and pump-fed systems were investigated for N204 and both MMH and N2H4 fuels with the result that N2H4 provides the maximum payload for all satellites over MMH. The higher pressure engine offers improved performance with smaller envelope and associated weight savings. ... |
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| Protective Coatings to Promote Oxidation Resistance, Wear Resistance, and Damage Tolerance to Composite Structures using the LTAVD Process |
JAN 1995 |
28 pages |
| Authors:
Michael W. Dean; VAPOR TECHNOLOGIES INC BOULDER CO
|
| One of the major barriers that restricts the expanded use of high- performance, resin-matrix composite materials in both government and commercial applications is the lack of a reliable, cost-effective coating process. The desired technique must deposit a variety of protective coatings without degrading the underlying composite structure while minimizing any environmental hazards. This Phase I SBlR demonstrated feasibility of using a commercially- viable coating process, called Low Temperature Arc Vapor ... |
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| Flow Tripped Injector. |
04 OCT 1994 |
|
| Authors:
Steven K. Whiteside; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A turbulent flow injector includes a ceramic injector body having an outer cylindrical wall with an inner surface, an inner cylindrical wall having an inner surface, an end walt at an outlet end of the body terminating the outer and inner walls so as to define an annular cavity between the inner and outer walls. The annular cavity is open at an inlet end of the body. A duct, defined ... |
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| Malone-Brayton Cycle Engine/Heat Pump. |
12 JUL 1994 |
|
| Authors:
Thomas A. Gilmour; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A machine, such as a heat pump, and having an all liquid heat exchange fluid, operates over a more nearly ideal thermodynamic cycle by adjustment of the proportionality of the volumetric capacities of a compressor and an expander to approximate the proportionality of the densities of the liquid heat exchange fluid at the chosen working pressures. Preferred forms of a unit including both the compressor and the expander on a ... |
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| Module Cooling System. |
05 JUL 1994 |
|
| Authors:
Frank E. Altoz; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| An apparatus is provided for cooling electronic components mounted on a circuit board. The circuit board is placed in thermal contact with a heat sink enclosure that has an interior cavity and a release opening that provides a path from the interior cavity to the external ambient. A meltable pellet blocks the release opening. A wick is bonded to the inside surface of the interior cavity. The device is sealed ... |
|
| Semiconductor Laser Array Cooler Development |
MAR 1994 |
85 pages |
| Authors:
Geoffrey O. Campbell; SADDLEBACK AEROSPACE MISSION VIEJO CA
|
| Progress in the development of Semiconductor Laser Diode Arrays (SLDAs) has resulted in high efficiency, compact devices suitable for use in a variety of applications. As these devices are driven to operation at increasing power levels, heat dissipation problems can limit the peak power, lasing line stability, and/or the lifetime of the array. Already, SLDAs currently being fabricated have heat dissipation requirements that cannot be met by conventional heat sink ... |
|
| International Conference on Thermoelectrics (13th). Held in Kansas City, Missouri, on 30 August-1 September 94. AIP Proceedings 316 |
94 |
|
| Authors:
B. Mathiprakasam; Patrick Heenan; AMERICAN INST OF PHYSICS NEW YORK
|
| PARTIAL CONTENTS: Section A - High Temperature Materials; Section B - Room/Low Temperature Applications; Section C - Room/Low Temperature Materials; Section D - High Temperature Applications. (KAR) P. 5, 7, 9, 11 |
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| Development of Large Area rf Induction Plasmas for Cost Effective Diamond |
OCT 93 |
15 pages |
| Authors:
R. A. Rudder; R. C. Hendry; RESEARCH TRIANGLE INST RESEARCH TRIANGLE PARK NC
|
| Progress continues on the development of a large area rf induction plasma system. An early problem with a hole in the deposition pattern has been assigned to poor gas distribution. The injection port has been modified to eliminate the hole . 30 microns films on quartz substrates have been fabricated. Plasma modeling and gas modeling have been initiated. A downstream process gas monitor has been proven. A smaller scale system ... |
|
| Construction of a Connectionist Network Supercomputer |
01 MAY 93 |
3 pages |
| Authors:
CALIFORNIA UNIV BERKELEY
|
|
| Semiconductor Laser Weapon Trainer and Target Designator for Live Fire. |
16 MAR 1993 |
|
| Authors:
Albert H. Marshall; Ronald S. Wolff; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| Disclosed is a capability for training and other uses wherein a firearm can be aligned with its target by use of a laser beam, or the target can be designated to others by illuminating it with the laser beam. A laser diode that provides visible light is used in conjunction with the boresight of a gun to paint a visible spot on an intended target at the location the bullet ... |
|
| Analysis of Cost: CVD Diamond Deposition and Finishing |
93 |
46 pages |
| Authors:
IBIS ASSOCIATES INC WELLESLEY MA
|
| This report describes several methods for polishing CVD diamond films, which can be applied separately or in conjunction with each other. These technologies are shown in Figure 1. From industry interviews, IBIS determined that the required surface roughness for the subsequent metallization operation is on the order of 0.1 microns, and polishing operations must be chosen to meet this specification while maximizing material removal rates. According to the experts surveyed, ... |
|
| Analysis of Cost: CVD Diamond Deposition and Finishing |
93 |
24 pages |
| Authors:
IBIS ASSOCIATES INC WELLESLEY MA
|
| IBIS Associate has updated its predictive spreadsheet models of the CVD diamond film finishing technologies, and has solicited expert review for the DC arcjet, microwave, and finishing models. This report presents the results obtained with the new models and revised sets of baseline inputs for diamond heat sink manufacture. For this report and the results contained herein, it is assumed that the regressions which estimate CVD diamond removal rates for ... |
|
| Diamond and Refractory Coatings of Gun Barrels for Electrothermal- Chemical Launchers |
01 NOV 92 |
15 pages |
| Authors:
M. A. Bourham; J. G. Gilligan; O. E. Hankins; J. D. Hurley; W. H. Eddy; NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF NUCLEAR ENGINEERING
|
| Material surfaces of gun barrels in electrothermal-chemical launchers are subject to high heat fluxes, which may exceed l00GW/m2 over 0.01-5 ms pulse duration. Such high heat fluxes result in several deforming processes of barrel material, which reduce the efficiency and lifetime of the launcher. The successful operation requires minimum erosion over a large number of repetitive exposures. Diamond and refractory coated barrel material surfaces have been exposed to high heat ... |
|
| Micro-T Telemetry System. |
20 OCT 1992 |
|
| Authors:
Larry L. Rollingson; Richard G. Drake; Kenneth P. Lusk; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A small telemetry system for small diameter missiles uses a combined wrap around antenna, discreet circuit boards, and heat-sink bulkheads to achieve a small telemetry system to replace the payload on such missiles. |
|
| Innovative Techniques for the Production of Low Cost 2D Laser Diode Arrays |
31 MAY 92 |
7 pages |
| Authors:
NORTHEAST SEMICONDUCTOR INC ITHACA NY
|
| This program consists of four phases which will demonstrate reduced manufacturing cost and improved device performance of a MBE laser diode arrays. The four phases listed below will result in milestones in processing, packaging, and testing along with delivery of the specified number of 5-bar laser arrays. (1) Concept phase: Conceptual design and organization of this phase II program. NSI will utilize the current side cooled strained relief package to ... |
|
| GaAs-Based Optoelectronic Neurons, |
22 MAY 1992 |
|
| Authors:
Steven Lin; Francis Ho; Jae Kim; Demetri Psaltis; CALIFORNIA INST OF TECH PASADENA DEPT OF ELECTRICAL ENGINEERING
|
| The optical implementation of a neural network consists of two basic components: a 2-D array of neurons and interconnections. Each neuron is a nonlinear processing element that, in its simplest form, produces an output which is the threshold version of the input. Liquid crystal spatial light modulators are candidates for such 2-D array of neurons. However, they are not flexible in their use. Optoelectronic integrated circuits (OEIC's), either hybrid, such ... |
|
| Application of Silicon Micromachining to Thermal Dissipation Issues in Wafer Scale Integrated Circuits |
DEC 91 |
277 pages |
| Authors:
Edward Cosnyka; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| The purpose of this research effort was to investigate the feasibility of applying the silicon micromachining technique to thermal management as applied to integrated circuits and wafer scale integration techniques. Three silicon micromachined structures and an untextured reference wafer were compared as heat-dissipating surfaces. These four surfaces were realized using 3-inch diameter, single crystal silicon wafers. The following structures were micromachined in silicon wafers using wet chemical, anisotropic etching and ... |
|
| Heat Sink Device for Electronics Modules Packaged in Cylindrical Casings. |
22 OCT 1991 |
|
| Authors:
Mark W. Sewell; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A device for dissipating heat from electronics encased in a circular housing is disclosed for uses in buoys, sonobuoys, mines and missiles. The device contains a heat dissipating ring that engages the inner surface of the cylindrical electronics case. The inside surface of this ring is tapered to receive a heat transfer disk that is pulled into tight union with the heat dissipating ring. A heat generating module is mounted ... |
|
| Process of Three Dimensional Lithography in Amorphous Polymers. |
27 AUG 1991 |
|
| Authors:
Mark F. Sonnenschein; Charles M. Roland; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A process of three dimensional lithography in amorphous polymers to form an instantaneous, permanent image in the polymer by the steps of providing an undoped, non-crystalline layer or film of a polymer having a stable amorphous stat under human operating conditions. Thin film is preferably poly(ethyleneterphthalate) (PET), poly(aryl-ether-ether-ketone) (PEEK), poly(chloro-trifluoroethylene) (Kel-F), poly(carbonate) (ie LEXAN 9032), poly(sulfone), poly(methylmethacrylate (PMMA, or LUCITE)), a poly (cyanurate) such as bisphenol A dicyanate, or an ... |
|
| Edge-Emitting Diode-to-Optical Fiber Coupling Technique. |
16 APR 1991 |
|
| Authors:
Donald J. Albares; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| An aligned and spaced-apart end-on optical coupling is provided between the end of a single mode optical fiber and the emitting aperture of an edge-emitting diode mounted on a heat sink secured to a base. A V-shaped grooved semiconductor chip is mounted on the base a distance from the edge-emitting diode and a UV curable optical cement is applied in the V-shaped groove and on a lateral surface of the ... |
|
| Thermal Management of Electronics |
DEC 90 |
7 pages |
| Authors:
Kevin G. Beasley; NAVAL WEAPONS SUPPORT CENTER CRANE IN
|
| The objective of this work is to use new materials and techniques to improve the thermal performance of electronic systems. The composite work will focus on corrosion protection of aluminum/graphite heatsinks and development of techniques to adequately machine continuous fiber composite material. Metal and polymer matrix composites will be developed for SEM heatsinks. Composite cardrails will also be developed using high thermal conductivity graphite fibers. Using the fact that composite ... |
|
| Reliability Study of TWT Output RF Window |
MAY 90 |
57 pages |
| Authors:
Peter J. Rocci; ROME AIR DEVELOPMENT CENTER GRIFFISS AFB NY
|
| Rome Air Development Center Computer-Aided Systems Engineering Branch, RBES, has documented an in-house effort to evaluate the structural reliability of the output waveguides window on a Traveling Wave Tube (TWT). This window acts as a seal between the TWT's vacuum envelope and output waveguide. Its purposes is to prevent any loss due to leakage of the vacuum while allowing passage of the microwave signal. This particular disk-shaped window is constructed ... |
|
| Effect of Interline Heat Flow Parameter on Contact Line Heat Transfer |
APR 90 |
36 pages |
| Authors:
Peter C. Wayner Jr; RENSSELAER POLYTECHNIC INST TROY NY DEPT OF CHEMICAL ENGINEERING
|
| A circular heat transfer cell was designed and fabricated to study fluid flow and change of phase heat transfer in the contact line region. The cell incorporates the use of ellipsometry and interferometry to measure ultra- thin film thickness profiles, which give the local pressure field for fluid flow. In addition, the total fluid flow rate and, therefore, the integral heat sink of the evaporating meniscus can be measured. A ... |
|
| Diamond Heat Sinks for Electronic Circuits |
90 |
4 pages |
| Authors:
Chou H. Li; LINTEL TECHNOLOGY INC ROSLYN NY
|
| During the interim stage of this Phase I R and D, a useful metallizing procedure for bulk diamond has been developed, with natural diamond chips, granules, and polished wafers from two vendors. Small-scale statistical experiments were designed and executed by systematically varying several material and processing variables including: metallizing and brazing compositions, processing temperature and time, ambient control, and other procedural changes. Under selected combinations of these variables, metallizing of ... |
|
| III-V Semiconductor Quantum Well Lasers and Related Optoelectronic Devices on Silicon |
DEC 89 |
31 pages |
| Authors:
N. Holonyak Jr.; K. C. Hsieh; G. E. Stillman; ILLINOIS UNIV AT URBANA
|
| The research goal is to further develop quantum well heterostructure (QWH) lasers and to realize reliable Al(x)Ga(1-x)As-GaAs QWH lasers on Si. In spite of the significant lattice and thermal expansion mismatch between GaAs and Si, the idea of splicing III-V semiconductor technology, i.e., optoelectronics and photonics, onto Si has obvious appeal. Adding to this is the fact, as shown earlier in this work, that cw 300 K Al(x)Ga(1-x)As-GaAs QWH lasers ... |
|
| Wick-Type Liquid-Metal Combustion |
OCT 89 |
68 pages |
| Authors:
L. D. Chen; H. Y. Lyu; K. Y. Hsu; IOWA UNIV IOWA CITY DEPT OF MECHANICAL ENGINEERING
|
| An experimental and theoretical investigation was conducted to study the wick combustion of Lithium and Sulfur hexafluoride. A single-line laser induced fluorescence thermometry with Li2 as fluorescence species was developed. The calibration experiments yielded promising results; refinements, however, are needed before the technique can be applied to combustion flame measurements. Wick combustion of ethanol and hexane in air as well as Li and SF6 was conducted in a vacuum chamber ... |
|
| Materials Processing of Diamond: Etching, Doping by Ion Implantation and Contact Formation |
30 SEP 89 |
46 pages |
| Authors:
Max L. Swanson; NORTH CAROLINA UNIV AT CHAPEL HILL DEPT OF PHYSICS AND ASTRONOMY
|
| We are studying implantation doping, etching, contact formation, and regrowth of natural diamond, for future applications to the fabrication of devices from thin film CVD diamond. In addition, we are characterizing thin film diamonds of other ONR contractors, using iron beam methods. In diamond, implantation doping is difficult because the high annealing temperature necessary to remove damage and to obtain efficient dopant activation often causes graphitization. We have used an ... |
|
| Thermal Model for Double-Drift IMPATT Diodes on Diamond Heat Sinks |
31 AUG 89 |
46 pages |
| Authors:
Geza Csanky; AEROSPACE CORP EL SEGUNDO CA ELECTRONICS RESEARCH LAB
|
| A thermal model of double-drift IMPATT diodes on diamond heat sinks has been developed. The thermal model approximates the temperature-dependent thermal conductivities of Si and diamond (Type II) by means of simple empirical formulas. The application of the thermal model to three IMPATT diode lits indicates that under life test, junction temperatures are greater than 700 C, while the metal/Si interface temperatures exceed 500 C. An explanation of the failure ... |
|
| LED Soldering Method Utilizing a PT Migration Barrier. |
04 APR 1989 |
|
| Authors:
Peter L. Tihanyi; Hubert J. Vollmer; Jeffrey S. Mott; DEPARTMENT OF THE AIR FORCE WASHINGTON DC
|
| Method of bonding a chip to a Cu heat sink comprises depositing a layer of Ni upon the sink, depositing a layer of Pt over the NI, and thereafter annealing the sink in a partial vacuum containing a reducing gas. After the annealing step, a metallic wetting layer of Au and a layer of In are sequentially deposited upon the Pt, and the chip is soldered to the heat sink ... |
|
| LIH Thermal Storage Capsule/Heat Exchanger. |
07 MAR 1989 |
|
| Authors:
Elliot B. Kennel; Edward T. Mahefkey; Jerry E. Beam; DEPARTMENT OF THE AIR FORCE WASHINGTON DC
|
| A thermal storage apparatus for use with space-based burst power supplies. Lithium hydride is encapsulated within spherical hollow capsules. Each capsule is made of a three layer hollow shell. The inner layer of each shell is molybdemum, the middle layer silicon carbide, and the outer layer molybdemum. The lithium hydride occupies only about sixty percent of the interior volume of each capsule at ambient temperatures to allow for thermal expansion. ... |
|
| Solid State Research |
07 MAR 89 |
|
| Authors:
Alan L. McWhorter; MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
|
| Time-Resolved Wavefront Measurement of a Pulsed Dye Laser Using Integrated Optics; GaP Microlenses by Mass Transport; A New OMVPE Reactor for Growth of InP and Related Alloys; Microchannel Heat Sinks for Two-Dimensional High Power-Density Diode Laser Arrays; Novel Scalloped-Mirror Diffraction- Coupled Laser Arrays; Three-Mirror Ti:Al2O3 Ring Laser Cavity; Femtosecond TiAl2O3 Injection-Seeded Laser; End-Pumped Nd:LaF3 and Nd:LaMgA11O19 La |
|
| Method of Making a Millimeter Wave Monolithic Integrated Circuit. |
23 JAN 1989 |
|
| Authors:
Arthur Paolella; DEPARTMENT OF THE ARMY WASHINGTON DC
|
| The general object of this invention is to provide a method of making a millimeter monolithic integrated circuit. A more specific object of the invention is to provide such a method that allows for device isolation during epitaxial growth and integral heat sink for low thermal resistance. A still further object of the invention is to provide such a method that will result in circuits that can be used as ... |
|
| Flexible Heat Pipe Cold Plate |
13 JAN 89 |
71 pages |
| Authors:
Nelson J. Gernert; THERMACORE INC LANCASTER PA
|
| The Naval Air Development Center is taking action to improve the reliability of aircraft flight control hydraulic actuators. Feedback and loop closure electronics are being mounted on the actuator, thereby eliminating numbers of electrical conductors between the actuator and the flight control computer. Methods for the electronics are required to help assure reliability. The Thermacore effort documented in this report investigated the feasibility of using heat pipe technology to thermally ... |
|
| A Cryocooler for High Acceleration Applications |
23 DEC 88 |
4 pages |
| Authors:
Michael L. Dingus; ALABAMA CRYOGENIC ENGINEERING HUNTSVILLE
|
| The design of the gas handling and gas panel system are finished. Baseline designs for the dewar support mount top plate have been completed. A commercially manufactured Gifford-McMahan (GM) cryocooler owned by ACE, Inc. has been identified for use as a heat sink for the heat exchanger during initial performance tests. This cryocooler would take the place of the liquid nitrogen vessel that was identified in the original proposal. Using ... |
|
| Interface Control Drawing for JTIDS (Joint Tactical Information Distribution System) Shipboard Antenna |
MAR 88 |
31 pages |
| Authors:
K. G. Kaufmann; NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA
|
| This Interface Control Drawing (ICD) establishes the mechanical and electrical interface requirements to integrate the Full Scale Development (FSD), Joint Tactical Information Distribution System (JTIDS) Shipboard Antenna on a shipboard platform. This ICD will be periodically updated as the interfaces are refined, to provide a common data reference. The JTIDS FSD Shipboard Antenna is a Circular Aperture Bicone array with an attached Power Combiner/Divider providing 12 RF ports. The array ... |
|
| Forced-Convection, Liquid-Cooled, Microchannel Heat Sinks |
07 JAN 1988 |
|
| Authors:
Richard J. Phillips; MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
|
| Water-cooled, microchannel heat sinks have been developed that can dissipate heat loads in excess of 1000 W/sq. cm with maximum surface temperatures <120 C. A theorectical model of microchannel heat sink thermal and fluid performance is presented. The model applies for small-, moderate-, and large-aspect-ratio channels, with fully developed and developing flow in the laminar and turbulent regimes. The channel surfaces may be smooth or roughened with repeated-ribs. Variable property ... |
|
| Natural Convection Immersion Cooling of an Array of Simulated Chips in an Enclosure Filled with Dielectric Liquid |
DEC 87 |
|
| Authors:
Turgay Pamuk; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| An experimental natural convection heat transfer study of a simulated electronic circuit board has been conducted. The board has an array of 9 simulated chips, each dissipating up to 2.5 Watts. The board is immersed in FC75, a fluorocarbon liquid, in an enclosure whose top and bottom surfaces are constant temperature heat sinks. The experimental data have been expressed in terms of relevant dimensionless heat transfer parameters such as Nusselt ... |
|
| Stored Energy Thermionics Modular Power System. |
13 OCT 1987 |
|
| Authors:
Steven M. Iden; DEPARTMENT OF THE AIR FORCE WASHINGTON DC
|
| An integrated high power modular thermionic power system is described which comprises a heat source including a generally cylindrically shaped chemical reaction chamber enclosing a first chemical reactant, such as lithium, for exothermal reaction with a second chemical reactant, such as sulfur hexafluoride, controllably supplied from a separate source thereof to the reaction chamber; a plurality of ring shaped thermionic modules disposed around the reaction chamber with the thermionic emitter ... |
|
| Method for Making Semiconductor Crystals. |
06 JAN 1987 |
|
| Authors:
Christopher M. Devaney; Robert J. Martineau; John L. Miles; Theodore T. Wong; DEPARTMENT OF THE AIR FORCE WASHINGTON DC
|
| A planar solid-state recrystallization process for growing mercury cadmium telluride (MCT) crystals suitable for semiconductor applications, in which molten MCT material is solidified in a horizontal sealed ampoule having a substantial portion of its lower external surface (i.e. a part of the ampoule surface which contains molten material) in heat-transfer contact with a heat sink, and having no substantial portion of the vapor-containing segment of the external ampoule wall in ... |
|
| Evaluation of Naphthene Rich Turbine Fuels as Heat Sinks for Hypersonic Aircraft |
JAN 87 |
|
| Authors:
Brian J. Lillis; J AND A ASSOCIATES INC GOLDEN CO
|
| A three phase program was undertaken to evaluate the current domestic production of naphthene rich turbine fuels. The first phase was a refinery survey to determine the magnitude of this production and its quality. Hydrocracker effluents are the chief source of these streams, and their turbine fuel cut is approximately 500,000 barrels per day. Samples were obtained from 20 domestic refiners and characterized for their naphthene and sulfur contents. Most ... |
|
| A Small Scale Thermosyphon Heat Exchanger |
01 NOV 86 |
|
| Authors:
Manoj Sujanani; Edward W. Kiewra; Peter C. Wayner Jr; RENSSELAER POLYTECHNIC INST TROY NY DEPT OF CHEMICAL ENGINEERING
|
| A small circular heat transfer cell was used to study the cooling of a disc heat source by a thin evaporating liquid film. This small scale thermosyphon is a thermal spreader and a passive heat sink in that the interfacially induced liquid flow rates are controlled by the heat input. To determine the pressure gradient, the evaporating liquid film profile is 'viewed' interferometrically through the objective of a microscope which ... |
|
| Surgical Scrub Sink NSN 6545-01-117-3894. Modification and Evaluation |
13 AUG 86 |
|
| Authors:
Kirsten L. Hanson; ARMY MEDICAL BIOENGINEERING RESEARCH AND DEVELOPMENT LAB FORT DETRICK MD
|
| The surgical scrub sink was developed to provide a facility for scrubbing at field hospitals. Complaints were received stating that the sink used too high a volume of water, so a manifold with small inner diameter was installed at the pump outlet post to restrict flow. The restriction forced the pump to operate against increasingly high back pressures. Consequently, the water pump frequently overheated and required replacement of prematurely worn ... |
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Reports by Keyword(s)
HEAT SINKS
