Entropy generation in a partially heated hybrid nanofluid saturated wavy porous cavity
International Journal of Numerical Methods for Heat & Fluid Flow
ISSN: 0961-5539
Article publication date: 5 February 2024
Issue publication date: 23 February 2024
Abstract
Purpose
A porous cavity flow field generates entropy owing to energy and momentum exchange within the fluid and at solid barriers. The heat transport and viscosity effects on fluid and solid walls irreversibly generate entropy. This numerical study aims to investigate convective heat transfer together with entropy generation in a partially heated wavy porous cavity filled with a hybrid nanofluid.
Design/methodology/approach
The governing equations are nondimensionalized and the domain is transformed into a unit square. A second-order finite difference method is used to have numerical solutions to nondimensional unknowns such as stream function and temperature. This numerical computation is conducted to explore a wide range of regulating parameters, e.g. hybrid nano-particle volume fraction (σ = 0.1%, 0.33%, 0.75%, 1%, 2%), Rayleigh–Darcy number (Ra = 10, 102, 103), dimensionless length of the heat source (ϵ = 0.25, 0.50,1.0) and amplitude of the wave (a = 0.05, 0.10, 0.15) for a number of undulations (N = 1, 3) per unit length.
Findings
A thorough analysis is conducted to analyze the effect of multiple factors such as thermal convective forces, heat source, surface corrugation factors, nanofluid volume fraction and other parameters on entropy generation. The flow and temperature fields are studied through streamlines and isotherms. The average Bejan number suggested that entropy generation is entirely dominated by irreversibility due to heat transport at Ra = 10, and the irreversibility due to the viscosity effect is severe at Ra = 103, but the increment in s augments irreversibility due to the viscosity effect over the heat transport at Ra = 102.
Originality/value
To the best of the authors’ knowledge, this numerical study, for the first time, analyzes the influence of surface corrugation on the entropy generation related to the cooling of a partial heat source by the convection of a hybrid nanofluid.
Keywords
Acknowledgements
Erratum: It has come to the attention of the publisher that the article Barman, P., Pentyala, S.R. and Rathish Kumar, B.V. (2024), “Entropy generation in a partially heated hybrid nanofluid saturated wavy porous cavity”, International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 34 No. 2, pp. 1060-1086. https://doi.org/10.1108/HFF-08-2023-0457, contained an incorrect Figure 15. This error was introduced during the production process. Figure 15 has now been corrected. The publisher sincerely apologises for this error and for any confusion caused.
Citation
Barman, P., Pentyala, S.R. and Rathish Kumar, B.V. (2024), "Entropy generation in a partially heated hybrid nanofluid saturated wavy porous cavity", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 34 No. 2, pp. 1060-1086. https://doi.org/10.1108/HFF-08-2023-0457
Publisher
:Emerald Publishing Limited
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