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FLUID to PARTICLE CONVECTIVE HEAT TRANSFER COEFFICIENT IN A HORIZONTAL SCRAPED SURFACE HEAT EXCHANGER DETERMINED FROM RELATIVE VELOCITY MEASUREMENT 1
Author(s) -
BALASUBRAMANIAM V.M.,
SASTRY S.K.
Publication year - 1996
Publication title -
journal of food process engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 45
eISSN - 1745-4530
pISSN - 0145-8876
DOI - 10.1111/j.1745-4530.1996.tb00382.x
Subject(s) - nusselt number , heat transfer coefficient , chemistry , thermodynamics , particle (ecology) , convective heat transfer , heat transfer , viscosity , heat exchanger , churchill–bernstein equation , analytical chemistry (journal) , chromatography , reynolds number , turbulence , physics , oceanography , geology
Liquid‐to‐particle convective heat transfer coefficient (h fp ) between fluid and particle was investigated in continuous flow through a horizontal scraped surface heat exchanger. the relative velocities between fluid and particle were measured, and h fp calculated from well known correlations. Heat transfer coefficients increased with increasing flow rate, rotational speed, and decreased with increasing carrier medium viscosity and particle size. the measured relative velocities during flow visualization studies ranged from 0.04 to 0.29 m/s with corresponding h fp values of 597 W/m 2 °K and 1975 W/m 2 °K, respectively. Even with the most conservative correlation, Nusselt numbers ranged from 12.1 to 49.7; significantly greater than the value of 2.0 for a sphere in a stagnant fluid.