During convective drying of initially fully saturated granular beds, the solid matrix is gradually exposed to the ambient air, resulting in heat transfer to both the liquid and solid. In an attempt to examine the heat and mass transfer processes occurring on the surface and to examine the influence of particle size and Bond number on the drying rate, experiments are performed in which granular beds constructed of spherical particles (which range from d = 0.2 mm to d = 25.4 mm) are convectively dried. For beds constructed of very small particles (d = 0.2 mm, Bo = 0.0035) the surface areas of the liquid and solid are difficult to estimate due to the random arrangement of the particles. The experimental results confirm existing knowledge that the evaporation rate is nearly constant during the funicular state of drying. For beds constructed of large particles (d = 25.4 mm, Bo = 21.7) an estimate of the surface areas of the liquid and solid reveals that the surface areas and the evaporation rate are highly dependent on surface saturation, contact angle, and surface tension. The results indicate that heat transfer from the solid to the liquid is significant and that the heat and mass transfer processes are not analogous.
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August 1990
Research Papers
Variation of Heat and Mass Transfer Coefficients During Drying of Granular Beds
J. A. Rogers
,
J. A. Rogers
Department of Mechanical Engineering and Applied Mechanics, University of Michigan, Ann Arbor, MI 48109
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M. Kaviany
M. Kaviany
Department of Mechanical Engineering and Applied Mechanics, University of Michigan, Ann Arbor, MI 48109
Search for other works by this author on:
J. A. Rogers
Department of Mechanical Engineering and Applied Mechanics, University of Michigan, Ann Arbor, MI 48109
M. Kaviany
Department of Mechanical Engineering and Applied Mechanics, University of Michigan, Ann Arbor, MI 48109
J. Heat Transfer. Aug 1990, 112(3): 668-674 (7 pages)
Published Online: August 1, 1990
Article history
Received:
July 21, 1988
Revised:
October 2, 1989
Online:
May 23, 2008
Citation
Rogers, J. A., and Kaviany, M. (August 1, 1990). "Variation of Heat and Mass Transfer Coefficients During Drying of Granular Beds." ASME. J. Heat Transfer. August 1990; 112(3): 668–674. https://doi.org/10.1115/1.2910439
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