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RESEARCH PAPERS: Radiative Transfer

Heat Transfer From Radiatively Heated Material in a Low Reynolds Number Microgravity Environment

[+] Author and Article Information
H. Yamashita, H. R. Baum, G. Kushida, K. Nakabe, T. Kashiwagi

Building and Fire Research Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899

J. Heat Transfer 115(2), 418-425 (May 01, 1993) (8 pages) doi:10.1115/1.2910694 History: Received March 01, 1992; Revised November 01, 1992; Online May 23, 2008

Abstract

A mathematical model of the transient three-dimensional heat transfer between a slowly moving ambient gas stream and a thermally thick or thin flat surface heated by external radiation in a microgravity environment is presented. The problem is motivated in part by fire safety issues in spacecraft. The gas phase is represented by variable property convection-diffusion energy and mass conservation equations valid at low Reynolds numbers. The absence of gravity and low Reynolds number together permit the flow to be represented by a self-consistent velocity potential determined by the ambient velocity and the thermal expansion in the gas. The solid exchanges energy with the gas by conduction/convection and with the surroundings by surface absorption and re-emission of radiation. Heat conduction in the solid is assumed to be one dimensional at each point on the surface as a consequence of the limited times (of order of 10 seconds) of interest in these simulations. Despite the apparent simplicity of the model, the results show a complex thermally induced flow near the heated surface. The thermal exchange between the gas and solid produces an outward sourcelike flow upstream of the center of the irradiated area and a sinklike flow downstream. The responses of the temperature fields and the associated flows to changes in the intensity of the external radiation and the ambient velocity are discussed.

Copyright © 1993 by The American Society of Mechanical Engineers
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