Cross-buoyancy mixed convection from a heated cylinder placed asymmetrically in a channel

Dhiman, Amit and Gupta, Rishabh and Baranyi, László (2018) Cross-buoyancy mixed convection from a heated cylinder placed asymmetrically in a channel. INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER, 95. pp. 139-146. ISSN 0735-1933

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Abstract

Mixed convection heat transfer from a heated circular cylinder asymmetrically placed in a horizontal channel was studied for incompressible Newtonian fluid. A systematic investigation using two-dimensional numerical simulation (Ansys Fluent) was performed for the following control parameters: Reynolds number Re=50, 100, 150, Richardson number Ri=0, 1, 2, blockage ratio β=0.2, 0.3, 0.4, gap ratio γ=0.25, 0.5, 1 and Prandtl number of air Pr=0.7. Upon changing these parameters, steady and time periodic regimes were identified. The strongest influence on heat transfer (average Nusselt number) was identified when changing the Reynolds number (a 94% increase between the minimum and maximum Re investigated, with other parameters held constant), followed by Richardson number (+18%) and blockage ratio (+16%); the effect of asymmetric placement (γ) was almost negligible (+1%). The time-mean of the drag coefficient was most influenced by blockage ratio (a 150% increase), followed by Richardson number (+91%), gap ratio (+19%), and Re (+10%).

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