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|Title:||Friction factors of power-law fluids in chevron-type plate heat exchangers|
|Author:||Fernandes, Carla S.|
Dias, Ricardo P.
Nóbrega, João M.
Maia, João M.
|Keywords:||Plate heat exchangers|
Generalised Reynolds number
|Citation:||Fernandes, Carla S.; Dias, Ricardo P.; Nóbrega, João M.; Maia, João M. (2008) - Friction factors of power-law fluids in chevron-type plate heat exchangers. Journal of Food Engineering. ISSN 0260-8774. 89:4, p.441-447|
|Abstract:||In the present work laminar flows of Newtonian and power-law fluids through cross-corrugated chevron-type plate heat exchangers (PHEs) are numerically studied in terms of the geometry of the channels. The plates area enlargement factor was a typical one (1.17), the corrugation angle, β, varied between 30° and 60° and the flow index behaviour, n, between 0.25 and 1. Single friction curves fReg = K for both Newtonian and non-Newtonian fluids are proposed for each β by developing an adequate definition of the generalised Reynolds number, Reg. The coefficient K compares well with experimental data, for all (seven) values of β, and depends on the tortuosity coefficient, τ. It was found that, for each β, τ decreases with the decrease of n. Food fluids are frequently processed in PHEs and usually behave as non-Newtonian fluids. This study can be useful in engineering applications as well as in the characterization of transport phenomena in PHEs.|
|Appears in Collections:||DEMAT - Artigos em Revistas Indexados ao ISI/Scopus|
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