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Pool boiling from a surface with a porous layer

Authors

  • S. M. Lu,

    Corresponding author
    1. Chemical Engineering Department, National Taiwan University, Taipei, Taiwan, Republic of China
    • Chemical Engineering Department, National Taiwan University, Taipei, Taiwan, Republic of China
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  • R. H. Chang

    1. Chemical Engineering Department, National Taiwan University, Taipei, Taiwan, Republic of China
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Abstract

Boiling heat transfer from a porous layer sintered on a horizontal heater surface and heated from the base was analyzed for laminar to turbulent regions. The effects of the thickness of the porous layer, particle diameter, porosity, pore size distribution, and the properties of fluids on boiling heat transfer were analyzed. Reynolds number, parameter ψ, and a dimensionless heat flux were related to each other. Most experimental data used in this work fall in the region where the vapor Reynolds number is less than 100; very few data exceeded far beyond 1,000.

For thick porous beds, the thickness no longer affects the heat transfer. For thin porous beds, heat transfer is affected by the thickness of the porous layer. The prediction equations of various investigators for dryout heat flux were put into dimensionless forms and the differences that exist among the equations are explained.

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