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Effect of internal heat source on stability analysis of a highly permeable vertical porous channel filled with nanofluid

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Abstract

A comprehensive numerical study of convective instability of nanofluid flow in a vertical channel filled with a highly permeable porous material is investigated due to internal heat source effect. The Brinkman–Darcy model has been taken which incorporates the influences of thermophoresis and Brownian motion. A normal mode technique has been employed on the disturbances equations to get the generalized eigenvalue problem and which is solved by Chebyshev spectral collocation method via QZ algorithm in MATLAB. Finally, the critical modified Grashof number (\(Gr'_\text {c}\)) and corresponding wavenumber (\(\alpha _\text {c}\)) have been calculated and portrayed for the flow-governed parameters. It is found that instability boundaries can be reduced or increased by the governing parameters due to the heat source effect. Further, it is discovered that the shape of the isotherms and isonanoconcentrations changes from a bi-cellular structure to a tetra-cellular structure as strength of the internal heat increases, but the streamlines remain at bi-cellular structure.

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Authors and Affiliations

  1. Department of Mathematics, National Institute of Technology Warangal, Hanamkonda, Warangal, 506004, TS, India

    Dipak Barman

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  1. Dipak Barman
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Contributions

Dipak Barman conceived the presented idea and developed the theory, performed the computations, and then verified the code by the number of collocation points. Then, Dipak Barman presents the instability boundaries due to the effect of various parameters graphically. Finally, Dipak Barman reviewed the results and contributed to the final manuscript.

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Correspondence to Dipak Barman.

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Barman, D. Effect of internal heat source on stability analysis of a highly permeable vertical porous channel filled with nanofluid. J Eng Math 140, 11 (2023). https://doi.org/10.1007/s10665-023-10275-6

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