Radiation Heat Transfer Control by a Porous Layer and Gas Injection

Shigenao Maruyama

doi:10.1299/kikaib.58.211

Radiation Heat Transfer Control by a Porous Layer and Gas Injection

Shigenao Maruyama

Complex Flow Research Division

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

The possibility of radiation heat transfer control by a combined model of an active thermal insulation system and a radiative converter was investigated. A semitransparent porous layer was placed between a high-temperature region and a low-temperature region, and gas was injected through the layer in the positive and negative directions. The mechanism of heat transfer is completely different for the positive and negative mass flux. By changing mass flux of air between-0.1 and 0 kg m^-2s^-1, dimensionless radiative flux at the back face can be controlled between 2×10⁴ and 0.1. In this region, the porous layer behaves as the active thermal insulation system, and the mechanism of the radiation heat transfer control is similar to that of a triode.

Original language	English
Pages (from-to)	211-215
Number of pages	5
Journal	Transactions of the Japan Society of Mechanical Engineers Series B
Volume	58
Issue number	545
DOIs	https://doi.org/10.1299/kikaib.58.211
Publication status	Published - 1992 Jan 1

Keywords

Active Thermal Insulation
Heat Transfer Control
Porous Media
Radiative Converter
Thermal Radiation

ASJC Scopus subject areas

Condensed Matter Physics
Mechanical Engineering

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abstract = "The possibility of radiation heat transfer control by a combined model of an active thermal insulation system and a radiative converter was investigated. A semitransparent porous layer was placed between a high-temperature region and a low-temperature region, and gas was injected through the layer in the positive and negative directions. The mechanism of heat transfer is completely different for the positive and negative mass flux. By changing mass flux of air between-0.1 and 0 kg m-2s-1, dimensionless radiative flux at the back face can be controlled between 2×104 and 0.1. In this region, the porous layer behaves as the active thermal insulation system, and the mechanism of the radiation heat transfer control is similar to that of a triode.",

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AB - The possibility of radiation heat transfer control by a combined model of an active thermal insulation system and a radiative converter was investigated. A semitransparent porous layer was placed between a high-temperature region and a low-temperature region, and gas was injected through the layer in the positive and negative directions. The mechanism of heat transfer is completely different for the positive and negative mass flux. By changing mass flux of air between-0.1 and 0 kg m-2s-1, dimensionless radiative flux at the back face can be controlled between 2×104 and 0.1. In this region, the porous layer behaves as the active thermal insulation system, and the mechanism of the radiation heat transfer control is similar to that of a triode.

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KW - Radiative Converter

KW - Thermal Radiation

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