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Spatial Variation of Convective Heat Transfer Coefficient in Air Impingement Applications
Author(s) -
Sarkar A.,
Singh R.P.
Publication year - 2003
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.2003.tb08264.x
Subject(s) - heat transfer coefficient , heat transfer , convection , jet (fluid) , variation (astronomy) , mechanics , materials science , convective heat transfer , thermodynamics , meteorology , physics , astrophysics
Spatial variation of heat transfer is an important factor in air impingement systems. Temperature data were obtained when a jet at room temperature impinged on a flat object initially at −50 °C to estimate heat transfer under freeze‐thaw conditions. Single and double circular jets and slot jets were examined. Temperature data were fit into empirical relationships for predicting heat transfer coefficients and their spatial variation for conditions common in impingement freeze‐thaw applications. For processing conditions involving cooling, the impingement surface was initially heated to a temperature of 70 °C and allowed to cool when subjected to impingement with room temperature air.