Thermal and entropy analysis of magneto-conjugate convection in a lid-driven chamfered cavity with a rotating cylinder
Year: 2026
Type: article
Abstract: This research investigates the entropy generation and MHD conjugate pure forced-free convection in a chamfered lid-driven enclosure filled with Fe 3 O 4 -water ferrofluid and containing a heat-generating rotating cylinder. The impact of key parameters, including the Hartmann (1.77 ≤ Ha ≤ 56.23), Reynolds (3.16 ≤ Re ≤ 3162.3), Grashof (10 1 ≤ Gr ≤ 10 7 ) numbers, three different vertical cylinder position and four material thermal conductivities range from 80.2 Wm -1 K -1 to 429 Wm -1 K -1 , are systematically analyzed to understand their influence on the working-fluid and heat flow and thermodynamic performance. The equations that govern the system are solved dimensionally by utilizing the Galerkin finite element method, and the results are validated through grid independence tests. The investigation reveals that the cylinder center position ( X c , Yc ) = (0.5, 0.5) achieves 1.5 – 2 times higher Nu and 20 – 30% lower S T than off-center vertical positions ( Y c = 0.4, 0.6 ), attributed to symmetric flow and enhanced thermal mixing. At Gr = 10 7 and Re = 3162.3, the CCW cylinder rotation combined with LR lid motion achieves up to 1.8 times higher Nu than other cases. A low-conductivity cylinder ( k s = 80.2 W/mK) promotes convective dominance, enhancing Nu by 1.1–1.5 times, while a high-conductivity cylinder ( k s = 429 W/mK) reduces temperature gradients, improving TPC by almost15%. These results make available insightful information that can be used in the design and improvement of thermal management systems, such as electronic cooling devices, Nuclear reactors and magnetic field-assisted heat exchangers, where minimizing energy losses and maximizing thermal efficiency are critical. Specially, optimal configurations ( CCW-LR, Y c = 0.5 ) are relevant for electronic cooling (reduced S T ) and high- Nu systems.
Source: Results in Engineering
Institution: Koneru Lakshmaiah Education Foundation
Language: English
Subfield: Fluid Flow and Transfer Processes
Field: Chemical Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,940
OpenAlex ID: W7166324077