Thermal Analysis of Magneto-Natural Convection Flows within a Partially Thermally Active Rectangular Enclosure

Suvash C. Saha (), Shams ul Islam, Zahida Zia, M. Saleem and Shafee Ahmad
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Suvash C. Saha: School of Mechanical and Mechatronic Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia
Shams ul Islam: Department of Mathematics, COMSATS University Islamabad, Islamabad 45550, Pakistan
Zahida Zia: Department of Mathematics, COMSATS University Islamabad, Islamabad 45550, Pakistan
M. Saleem: Department of Science and Humanities, Sir Syed CASE Institute of Technology, Islamabad 44000, Pakistan
Shafee Ahmad: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China

Energies, 2023, vol. 16, issue 11, 1-23

Abstract: In this study, we numerically investigate heat transfer enhancement in a partially thermally active rectangular enclosure. The enclosure is filled with a ternary hybrid nanofluid (water, Carbon Nanotube, A l 2 O 3 , and Graphene). It is subjected to a magnetic field and uniform internal heat generation. The study also investigates the effect of magnetic field strength and direction on the natural convection flow, which arises from density fluctuations caused by partial heating of the left vertical wall. To solve the dimensionless governing equations, the finite element approach is employed. The parameters studied in detail include Rayleigh number ( R a ) , Hartmann number ( H a ) , nanoparticle volume fraction ( ϕ ) , and heat generation coefficient ( λ ) . The findings are presented graphically for the range of the parameters as follows: 10 3 ≤ R a ≤ 10 6 , 0 ≤ H a ≤ 20 , 0.01 ≤ ϕ ≤ 0.05 , and 0 ≤ λ ≤ 15 . It is noted that these parameters have an impact on heat transfer enhancement, flow patterns, and temperature fields. The results show that the average Nusselt number ( N u ¯ ) increases with an increasing value of ϕ . Moreover, it has been noted that N u ¯ decreases as the value of H a increases, and the impact becomes more obvious at higher R a values. Finally, the influence of the heat generation coefficient on the heat transfer rate inside an enclosure is examined.

Keywords: natural convection; inclined magnetic field; ternary hybrid nanofluid; rectangular enclosure; heat generation coefficient; heat transfer (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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