Choking of a subsonic gas flow by thermal radiation.
Thermal radiation effects on subsonic flow of ideal gray gas, calculating streamwise variations of flow properties
George, Y. H.↗
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Results for “THERMAL RADIATION”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Thermal radiative property measurements using cyclic radiation
Thermal radiative property measurements using cyclic radiation
Jack, J. R.↗
Thermal-Radiation Program
Thermal Radiation Analyzer System (TRASYS) computer program is software program having generalized capability to solve equations of radiation-related aspects of thermal-analysis problems. Computes total thermal-radiation environment for spacecraft in orbit. Software calculates internode-radiation-interchange data as well as data on rates of incidence and absorption of heat originating from environmental radiant sources. Provides data of both types in format directly usable by such thermal-analyzer programs as SINDA '85/FLUINT (available from COSMIC, program number MSC-21528). CRAY version of TRASYS (P25) written in FORTRAN 77. Other versions available upon request.
Anderson, Gordon↗
Preparation for an investigation of the thermal radiation characteristics and thermal conductivity of lunar material Final report, 1968
Vacuum system and chamber design, and thermal radiation and conductivity measurement techniques for lunar material investigations
Birkebak, R. C.↗
Thermal Radiation Analyzer
Thermal Radiation Analyzer System TRASYS II solves radiation related aspects of thermal analysis problems. TRASYS II provides for calculation of internode radiation interchange data and for calculation of incident and absorbed heat rate data originating from environmental radiant heat sources. When TRASYS II used in conjunction with generalized thermal analysis program such as Systems Improved Numerical Differencing Analyzer (SINDA), any thermal problem expressed in terms of lumped parameter RC thermal network solved.
Vogt, R. A.↗
Characteristics of ionospheric thermal radiation.
Ionospheric thermal radiation, discussing noise power per unit volume, spectral distribution, frequency, etc
THERMAL RADIATION↗
Space radiation damage to the thermal radiative properties of materials.
Thermal radiative property behavior of materials under elementary charged particle bombardment, determining effect of combined UV plus electron exposure and low energy proton bombardment
THERMAL RADIATION↗
Updated Thermal-Radiation Program
Thermal Radiation Analyzer System, TRASYS II, is computer-software system with generalized capability to solve radiation-related aspects of thermal-analysis problems. Used in conjunction with generalized thermal-analysis program, any thermal problem expressed in terms of lumped-parameter R-C thermal network solved.
Vogt, R. A.↗
The Lattice and Thermal Radiation Conductivity of Thermal Barrier Coatings
The lattice and radiation conductivity of thermal barrier coatings was evaluated using a laser heat flux approach. A diffusion model has been established to correlate the apparent thermal conductivity of the coating to the lattice and radiation conductivity. The radiation conductivity component can be expressed as a function of temperature and the scattering and absorption properties of the coating material. High temperature scattering and absorption of the coating systems can also be derived based on the testing results using the modeling approach. The model prediction is found to have good agreement with experimental observations.
Zhu, Dongming↗
The Lattice and Thermal Radiation Conductivity of Thermal Barrier Coatings: Models and Experiments
The lattice and radiation conductivity of ZrO2-Y2O3 thermal barrier coatings was evaluated using a laser heat flux approach. A diffusion model has been established to correlate the coating apparent thermal conductivity to the lattice and radiation conductivity. The radiation conductivity component can be expressed as a function of temperature, coating material scattering, and absorption properties. High temperature scattering and absorption of the coating systems can be also derived based on the testing results using the modeling approach. A comparison has been made for the gray and nongray coating models in the plasma-sprayed thermal barrier coatings. The model prediction is found to have a good agreement with experimental observations.
Zhu, Dongming↗
Heat Transfer Issues in Thin-Film Thermal Radiation Detectors
The Thermal Radiation Group at Virginia Polytechnic Institute and State University has been working closely with scientists and engineers at NASA's Langley Research Center to develop accurate analytical and numerical models suitable for designing next generation thin-film thermal radiation detectors for earth radiation budget measurement applications. The current study provides an analytical model of the notional thermal radiation detector that takes into account thermal transport phenomena, such as the contact resistance between the layers of the detector, and is suitable for use in parameter estimation. It was found that the responsivity of the detector can increase significantly due to the presence of contact resistance between the layers of the detector. Also presented is the effect of doping the thermal impedance layer of the detector with conducting particles in order to electrically link the two junctions of the detector. It was found that the responsivity and the time response of the doped detector decrease significantly in this case. The corresponding decrease of the electrical resistance of the doped thermal impedance layer is not sufficient to significantly improve the electrical performance of the detector. Finally, the "roughness effect" is shown to be unable to explain the decrease in the thermal conductivity often reported for thin-film layers.
Barry, Mamadou Y.↗
Thermal Radiation Model Renodalization
Thermal Radiation Model Renodalization program redefines thermal model nodal geometry subsequent to generation of radiation interchange data. Program readily used with TRASYS thermal radiation program and SINDA thermal analyzer program. Program written in FORTRAN V.
Russell, D. J.↗
A review of some problem areas in the theory of thermal radiation of solids
Thermal radiation of solids - calculation of optical constants, radiation characteristics of rough surfaces of inhomogeneous materials, and complex systems
THERMAL RADIATION↗
Thermal Radiation Analyzer System
Thermal Radiation Analyzer System, TRASYS/II, is computer software system with generalized capability to solve radiation-related aspects of thermal-analysis problems. When used in conjunction with generalized thermalanalysis program, such as Systems Improved Numerical Differencing Analyzer (SINDA) program, any thermal problem expressed in terms of lumped-parameter RC thermal network solved.
Skladany, J.↗
A listing of references for thermal radiation configuration factors
Thermal radiation configuration factors tables giving reference sources, discussing historical development of factors
Howell, J. R.↗
Absorptance of thermal radiation by cryodeposit layers.
Thermal radiation absorptance of cryodeposit condensed upon thin metallic wall
CRYOGENICS↗
The Dielectric Bolometer, A New Type of Thermal Radiation Detector
Thermal detectors for the infrared, such as thermocouples and bolometers, are limited in their ultimate sensitivity predominantly by Johnson noise rather than temperature noise. Low noise figures are hard to achieve since Johnson noise preponderates temperature noise, which is the only essential noise for thermal detectors. The dielectric constants of some materials are sufficiently temperature dependent to make a new type of bolometer feasible. The basic theory of a dielectric bolometer, as shown here, promises noise figures below 3 decibels even at chopper frequencies well above the 1/tau value of the detector. Ferroelectrics such as barium-strontium titanate and others seem to be well suited for radiation-cooled dielectric bolometers.
Hanel, R. A.↗