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|Título:||Friction factors of power-law fluids in chevron-type plate heat exchangers.|
|Autor(es):||Fernandes, C. S.|
Nóbrega, J. M.
Maia, J. M.
|Palavras-chave:||plate heat exchangers|
generalised Reynolds number
|Revista:||Journal of Food Engineering|
|Resumo(s):||In the present work laminar flows of Newtonian and power-law fluids through cross-corrugated chevrontype 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, b, 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 b by developing an adequate definition of the generalised Reynolds number, Reg. The coefficient K compares well with experimental data, for all (seven) values of b, and depends on the tortuosity coefficient, s. It was found that, for each b, s 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.|
|Aparece nas coleções:||IPC - Artigos em revistas científicas internacionais com arbitragem|
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|22. Friction factors of power-law fluids in chevron-type plate heat exchangers.pdf||429,9 kB||Adobe PDF||Ver/Abrir Solicitar cópia ao autor!|