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.
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Heat Transfer From Radiatively Heated Material in a Low Reynolds Number Microgravity Environment
H. Yamashita,
H. Yamashita
Building and Fire Research Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899
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H. R. Baum,
H. R. Baum
Building and Fire Research Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899
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G. Kushida,
G. Kushida
Building and Fire Research Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899
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K. Nakabe,
K. Nakabe
Building and Fire Research Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899
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T. Kashiwagi
T. Kashiwagi
Building and Fire Research Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899
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H. Yamashita
Building and Fire Research Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899
H. R. Baum
Building and Fire Research Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899
G. Kushida
Building and Fire Research Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899
K. Nakabe
Building and Fire Research Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899
T. Kashiwagi
Building and Fire Research Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899
J. Heat Transfer. May 1993, 115(2): 418-425 (8 pages)
Published Online: May 1, 1993
Article history
Received:
March 1, 1992
Revised:
November 1, 1992
Online:
May 23, 2008
Citation
Yamashita, H., Baum, H. R., Kushida, G., Nakabe, K., and Kashiwagi, T. (May 1, 1993). "Heat Transfer From Radiatively Heated Material in a Low Reynolds Number Microgravity Environment." ASME. J. Heat Transfer. May 1993; 115(2): 418–425. https://doi.org/10.1115/1.2910694
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