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Print: | ISSN 0256-1115 |
Online: | ISSN 1975-7220 |
Korean Journal of Chemical Engineering,
Vol.15, No.3, 252-261, 1998 Shear Rate Dependence of Thermal Conductivity and Its Effect on Heat Transfer in a Non-Newtonian Flow System
The purpose of this research was to investigate the extent to which the thermal conductivity of non-Newtonian fluids is affected by fluid motion, and then the effect of this shear-rate-dependent thermal conductivity, measured in Lee [1995], on the heat transfer for a typical convective system. Such information would have important implications in the design and analysis of non-Newtonian thermal systems such as are found in food processing operations, polymer processing, paint manufacturing, biological systems and many others. A simple parallel plate flow model with temperature-independent properties gave increases in heat transfer on the order of 30-80% compared to the heat transfer with shear-rate-independent thermal conductivity in Newtonian fluid flow over the entire temperature range (20-50℃) of CMC solutions depending on the inlet average velocity due to the effect of the shear-rate-dependent thermal conductivity.
Keywords:
Non-Newtonian Fluid Flow; Thermophysical Property; Parallel Duct; Thermal Conductivity; Non-Newtonian Heat Transfer Coefficient
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