Identification of radiative heat transfer parameters in multilayer thermal insulation of spacecraft

Purpose The purpose of this study is to optimize multilayer vacuum thermal insulation (MLI) of modern high-weight spacecrafts. An adequate mathematical simulation of heat transfer in the MLI is impossible if there is no available information on the main insulation properties. Design/methodology/approach The results of experiments in thermo-vacuum facilities are used to re-estimate some radiative properties of metallic foil/metalized polymer foil and spacer on the basis of the inverse problem solution. The experiments were carried out for the sample of real MLI used for the BP-Colombo satellite (ESA). The recently developed theoretical model based on neglecting possible near-field effects in radiative heat transfer between closely spaced aluminum foils was used in theoretical predictions of heat transfer through the MLI. Findings A comparison of the computational results and the experimental data confirms that there are no significant near-field effects between the neighboring MLI layers. It means that there is no considerable contradiction between the far-field model of radiative transfer in MLI and the experimental estimates. Originality/value An identification procedure for mathematical model of the multilayer thermal insulation showed that a modified theoretical model developed recently can be used to estimate thermal properties of the insulation at conditions of space vacuum.

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Magnetic field effects in the near-field radiative heat transfer between planar structures

Physical Review B ◽

10.1103/physrevb.101.085411 ◽

2020 ◽

Vol 101 (8) ◽

Author(s):

E. Moncada-Villa ◽

J. C. Cuevas

Keyword(s):

Magnetic Field ◽

Heat Transfer ◽

Radiative Heat Transfer ◽

Radiative Heat ◽

Near Field ◽

Magnetic Field Effects ◽

Field Effects ◽

Planar Structures

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Numerical analysis of radiative heat transfer in an inhomogeneous and non-isothermal combustion system considering H2O/CO2/CO and soot

International Journal of Numerical Methods for Heat &amp Fluid Flow ◽

10.1108/hff-03-2016-0127 ◽

2017 ◽

Vol 27 (9) ◽

pp. 1967-1985 ◽

Cited By ~ 3

Author(s):

Zhenhua Wang ◽

Shikui Dong ◽

Zhihong He ◽

Lei Wang ◽

Weihua Yang ◽

...

Keyword(s):

Heat Transfer ◽

Heat Flux ◽

Radiative Heat Transfer ◽

Radiative Heat ◽

Radiative Properties ◽

Combustion System ◽

Radiation Heat ◽

Radiation Heat Flux ◽

Participating Media ◽

Content Type

Purpose H2O, CO2 and CO are three main species in combustion systems which have high volume fractions. In addition, soot has strong absorption in the infrared band. Thus, H2O, CO2, CO and soot may take important roles in radiative heat transfer. To provide calculations with high accuracy, all of the participating media should be considered non-gray media. Thus, the purpose of this paper is to study the effect of non-gray participating gases and soot on radiative heat transfer in an inhomogeneous and non-isothermal system. Design/methodology/approach To solve the radiative heat transfer, the fluid flow as well as the pressure, temperature and species distributions were first computed by FLUENT. The radiative properties of the participating media are calculated by the Statistical Narrow Band correlated K-distribution (SNBCK), which is based on the database of EM2C. The calculation of soot properties is based on the Mie scattering theory and Rayleigh theory. The radiative heat transfer is calculated by the discrete ordinate method (DOM). Findings Using SNBCK to calculate the radiative properties and DOM to calculate the radiative heat transfer, the influence of H2O, CO2, CO and soot on radiation heat flux to the wall in combustion system was studied. The results show that the global contribution of CO to the radiation heat flux on the wall in the kerosene furnace was about 2 per cent, but that it can reach up to 15 per cent in a solid fuel gasifier. The global contribution of soot to the radiation heat flux on the wall was 32 per cent. However, the scattering of soot has a tiny influence on radiation heat flux to the wall. Originality/value This is the first time H2O, CO2, CO and the scattering of soot were all considered simultaneously to study the radiation heat flux in combustion systems.

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Near-Field Thermal Radiation Between Mie Resonance-Based Metamaterials

ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer ◽

10.1115/mnhmt2012-75009 ◽

2012 ◽

Author(s):

Mathieu Francoeur ◽

Soumyadipta Basu ◽

Spencer J. Petersen

Keyword(s):

Heat Transfer ◽

Radiative Heat Transfer ◽

Radiative Heat ◽

Near Field ◽

Radiative Properties ◽

Surface Polariton ◽

Conversion Technologies ◽

First Time ◽

Vacuum Gap ◽

Sub Wavelength

Near-field radiative heat transfer between dielectric-based metamaterials separated by a sub-wavelength vacuum gap is analyzed. Metamaterials made of silicon carbide spherical inclusions within a dielectric host medium of potassium bromide are considered. We show for the first time that surface polariton mediated near-field radiative heat transfer in both TE and TM polarizations may occur between dielectric-based structures. The results presented in this work also demonstrate that it is possible to engineer materials with designer radiative properties, which is crucial in many emerging energy conversion technologies.

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