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ISSN Online: 2377-424X

ISBN Print: 1-56032-797-9

International Heat Transfer Conference 11
August, 23-28, 1998, Kyongju, Korea

NUMERICAL STUDY OF CAPILLARY REWETTING IN POROUS MEDIA

Get access (open in a dialog) DOI: 10.1615/IHTC11.4190
pages 509-514

Аннотация

A theoretical analysis was performed to describe the two-dimensional rewetting process in porous media with a constant heat flux at the top surface. Numerical solutions were obtained by an implicit finite difference scheme tailored to take account of the movement of the liquid front as rewetting progresses. The rewetting velocity and liquid front shape were obtained and found to vary with the applied heat flux, the permeability and porosity of the porous media, the thermophysical properties of the rewetting fluid and the porous media material. The maximum sustainable heat flux and the transient temperature distribution of the porous media were also predicted. In this study, the length of the porous media was chosen to be 250 mm, while the height varied from 20 to 30 mm. The pore diameter was varied from 2 to 8 um and the porosity range was 0.5-0.7. The working fluids investigated were water, ammonia, and acetone for porous nickel and stainless steel systems.