Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/17689
Título: | Friction factors of power-law fluids in chevron-type plate heat exchangers. |
Autor(es): | Fernandes, C. S. Dias, R. Nóbrega, J. M. Maia, J. M. |
Palavras-chave: | plate heat exchangers power-law fluids generalised Reynolds number friction factor tortuosity |
Data: | 2008 |
Editora: | Elsevier |
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. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/17689 |
DOI: | 10.1016/j.jfoodeng.2008.05.022 |
ISSN: | 0260-8774 |
Arbitragem científica: | yes |
Acesso: | Acesso restrito UMinho |
Aparece nas coleções: | IPC - Artigos em revistas científicas internacionais com arbitragem |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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22. Friction factors of power-law fluids in chevron-type plate heat exchangers.pdf Acesso restrito! | 429,9 kB | Adobe PDF | Ver/Abrir |