Laminar flow of viscoelastic fluids in rectangular ducts with heat transfer: A finite element analysis |
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| Affiliation: | 1. Department of Chemical and Environmental Engineering, Faculty of Science and Engineering, University of Nottingham Ningbo Campus, Ningbo 315100, China;2. School of Resource and Environment Sciences, Wuhan University, Wuhan, Hubei 430079, China;1. College of Mathematics, Taiyuan University of Technology, Taiyuan, China;2. School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, UK;1. Centro de Investigación en Creatividad y Educación Superior & Departmento de Ingeniería Mechánica, Universidad de Santiago de Chile, Santiago, Chile;2. Department of Mathematics and Statistical Sciences & Department of Mechanical, Energy and Industrial Engineering, Bostwana International University of Science and Technology, Palapye, Bostwana |
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| Abstract: | A numerical study on the laminar flow and heat transfer behavior of viscoelastic fluids in rectangular ducts is conducted using the finite element approach. A Criminale-Ericksen-Fibley relation is applied to describe the viscoelastic character of the fluid, and a hydrodynamically and thermally fully developed flow with the H1 thermal boundary condition is considered. The finite element procedure employed yields essentially mesh-independent predictions with a fairly moderate computational effort. Computed results are presented and discussed in terms of the secondary flow field, the temperature field, the friction factor and the Nusselt number. In particular it is shown that the presence of a secondary flow markedly alters the temperature field and results in a substantial heat transfer enhancement with all duct aspect ratios considered. |
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