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Heat transfer in beds of fine particles (heat transfer perpendicular to flow)
Author(s) -
Willhite G. P.,
Kunii Daizo,
Smith J. M.
Publication year - 1962
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690080315
Subject(s) - heat transfer , thermal conductivity , thermodynamics , reynolds number , fluid dynamics , chemistry , flow (mathematics) , conductivity , materials science , mechanics , turbulence , physics
Effective thermal conductivites were evaluated for beds of fine glass beads from experimental data on heat transfer perpendicular to the direction of fluid flow. Results were obtained for a bead size range of 29 to 940 μ and for carbon dioxide, nitrogen, helium, and a C 7 hydrocarbon liquid. The results showed that over the range of flow rate studied 0 to 80 lb./(hr.sq.ft.), or modified Reynolds number from 0 to 6.6, there was no effect of flow on the conductivity. Hence the measured stagnant conductivity k ° e also satisfactorily represented heat transfer for flowing conditions. In view of this result, methods of predicting the stagnant conductivity were re‐examined and a revised prediction method proposed. The equations are based upon a model which supposes energy to be transferred through a continuous fluid phase and through the solid particles by a solid‐fluid series mechanism. The equations are compared with the data available in the literature.