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

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%).

Analysis of mixed convective heat transfer past an isoflux/isothermal sphere: influence of Prandtl number

“…The study of mixed convection past a solid object has become an important area of research in the last few decades because of its innumerous applications in various fields of engineering [1][2][3][4][5]. The transport phenomena associated with the mixed convection process not only depend on the surrounding fluids, but also vary with the thermal conditions on the surface of the object.…”

Investigation of Heat Transfer and Fluid Flow Around Sinsoudal Corrugated Circular Cylinder for Two-Dimensional System

“…Results showed the controlled flows had a very small symmetrical wake, as there was no longer separated flow downstream. Amit et al (2018) studied numerically the mixed convection of the heat transfer from the circular cylinder by *Corresponding Author: Email: farooq_hassan77@yahoo.com using ANSYS at Reynolds number (Re=50, 100, 150) for Richardson number ( Ri=0, 1, 2) at steady and unsteady regimes. Results observed that the average Nusselt number is increased to 94% with increasing the Reynold number to (Re=150), while the average Nusselt number is increased to 18% with increasing the Richardson number to (Ri=2).…”