Abstract
The thermal convection of a Jeffreys fluid subjected to a plane Poiseuille flow in a fluid-porous system composed of a fluid layer and a porous layer is studied in the paper. A linear stability analysis and a Chebyshev τ-QZ algorithm are employed to solve the thermal mixed convection. Unlike the case in a single layer, the neutral curves of the two-layer system may be bi-modal in the proper depth ratio of the two layers. We find that the longitudinal rolls (LRs) only depend on the depth ratio. With the existence of the shear flow, the effects of the depth ratio, the Reynolds number, the Prandtl number, the stress relaxation, and strain retardation times on the transverse rolls (TRs) are also studied. Additionally, the thermal instability of the viscoelastic fluid is found to be more unstable than that of the Newtonian fluid in a two-layer system. In contrast to the case for Newtonian fluids, the TRs rather than the LRs may be the preferred mode for the viscoelastic fluids in some cases.
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Citation: YIN, C., WANG, C. W., and WANG, S. W. Thermal instability of a viscoelastic fluid in a fluid-porous system with a plane Poiseuille flow. Applied Mathematics and Mechanics, 41(11), 1631–1650 (English Edition) (2020) https://doi.org/10.1007/s10483-020-2663-7
Project supported by the National Natural Science Foundation of China (Nos. 11702135, 11271188, and 11672164), the Natural Science Foundation of Jiangsu Province of China (No. BK20170775), the China Postdoctoral Science Foundation (No. 2016M601798), and the Jiangsu Planned Project for Postdoctoral Research Funds (No. 1601169B)
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Yin, C., Wang, C. & Wang, S. Thermal instability of a viscoelastic fluid in a fluid-porous system with a plane Poiseuille flow. Appl. Math. Mech.-Engl. Ed. 41, 1631–1650 (2020). https://doi.org/10.1007/s10483-020-2663-7
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DOI: https://doi.org/10.1007/s10483-020-2663-7