An experimental study of heat and mass transfer during drying of packed beds

Journal Article · Sat Aug 01 00:00:00 EDT 1992 · Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States)

DOI:https://doi.org/10.1115/1.2911341· OSTI ID:7016176

Lee, W C; Plumb, O A; Gong, L ^[1]

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1. Washington State Univ., Pullman (United States)

An experimental study has been conducted to provide a data base for drying packed beds of granular, nonhygroscopic materials. Experimental results for drying rate, saturation distribution, temperature distribution, and surface saturation are reported for drying glass beads under carefully documented drying conditions. Capillary pressure for both imbibition and drainage was measured for the glass beads, whose size ranged from 65[mu]m to 450[mu]m. The drying results demonstrate that, contrary to available model predictions, porous materials do not necessarily exhibit saturation gradients that always increase with distance form the drying surface. Under certain conditions the capillary potential is sufficient to create an internal drying front. The measurements of surface saturation are the first to be reported. They are utilized to speculate on the reasons for the failure of drying models to compare well with experiment without adjusting the convective heat or mass transfer coefficients.

• OSTI ID: 7016176
• Journal Information: Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States), Journal Name: Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States) Vol. 114:3; ISSN JHTRAO; ISSN 0022-1481
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
BENCH-SCALE EXPERIMENTS
CAPILLARY FLOW
DRYING
ENERGY TRANSFER
FLUID FLOW
GLASS
HEAT TRANSFER
MASS TRANSFER
PACKED BEDS
SATURATION
TEMPERATURE DISTRIBUTION