Estimating Heat Transfer Coefficients and Friction Factors in Non-Newtonian Flows between Parallel Plates |
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| Authors: | Mauro Mendes Manuel A. Alves |
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| Affiliation: | 1. Departamento de Engenharia Mecanica, Faculdade de Engenharia da Universidade do Porto, Porto, Portugal;2. Centro de Estudos de Fenómenos de Transporte (CEFT), Departamento de Engenharia Química, Faculdade de Engenharia da Universidade do Porto, Porto, Portugal |
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| Abstract: | A simplified method, successfully tested previously for flow in circular pipes, is used in this work to estimate the friction factor and Nusselt number in fully-developed laminar flow between parallel plates of non-Newtonian fluids. Both constant wall temperature and constant wall heat flux cases are considered. The methodology was tested using several constitutive equations, including generalized Newtonian fluids, such as the Herschel–Bulkley, Bingham, Casson, and Carreau–Yasuda models, and also the simplified Phan-Thien–Tanner viscoelastic model. The error of the approximate methodology was found to be small, below 3.4%, except for the fluids with yield stress for which the maximum error increased to 8.4% for the cases analyzed, which cover a wide range of shear viscosity curves. |
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