Thermal analysis on a nanofluid-filled rectangular cavity with heated fins of different geometries under magnetic field effects
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Rectangular cavity filled with a non-Newtonian shear-thinning nanofluid was investigated considering varied fin geometry under a vertical magnetic field. Irreversibility and entropy generation mechanisms were investigated by finite element method. The effect of geometry parameter (a), Hartmann number (Ha), nanoparticles volume fraction (φ) and nanoparticles type (Fe3O4, CuO and Al2O3) on the Nusselt numbers, entropy generations and Bejan numbers were investigated by the response surface methodology (RSM). Increasing a leads to an increase in both local and average Nusselt numbers and increment in different terms of entropy generation, while it reduces the Bejan number. Fe3O4 nanoparticle shows the highest Nusselt number compared to other nanoparticles. RSM analysis revealed that a = 0.29 and φ = 0.04 are the optimized values for the goal of maximum Nusselt number and minimum Bejan number.
KeywordsEntropy generation Irreversibility Non-Newtonian nanofluid Bejan number Nusselt number
The authors gratefully acknowledge the financial supports of the National Natural Science Foundation of China (Nos. 51776165, 51888103) and the financial support from Royal Society-Newton Advanced Fellowship grant (NAF\R1\191163).This work was also supported by the China Fundamental Research Funds for the Central Universities.
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Conflict of interest
On behalf of all authors, the corresponding author states that there is no conflict of interest.
- 1.Choi SUS. Enhancing thermal conductivity of fluid with nanoparticles. In: Proceedings of the ASME international mechanical engineering congress, ASME FED-231; 1995. p. 99–105.Google Scholar