Impact of size and location of outflow opening vent on mixed convective heat transfer induced by two aligned heated cylinders immersed in a partially open channel

The current work deals with the numerical investigation of mixed convection occurring from two hot cylinders placed inside vented ducts under different sizes of inflow and locations of outflow opening vents. The mathematical formulation is solved based on the finite volume approach. The location of the outflow section is changed to left, center, and right of enclosure. Impacts of inflow section sizes ($\mathit{O}$₁ = 0.125 and $\mathit{O}$₁ = 0.25), locations of outflow section ($O_2$ = $0.125$), space between cylinders ($0.3\le S\le 0.45$), Reynolds number ($200\le Re\le 400$), and Richardson number ($0.1\le \mathit{Ri}\le 20$) are implemented. Findings display that the average Nusselt number (Nu) is exceeded by 20% for low $\mathit{Ri}$ due to the effect of nonsymmetrical inflow and outflow sections as compared with the case of equal opening vents. For large Ri, a higher Nu is obtained for nonequal opening vents in comparison with the case of equal opening vents by 10%. The difference in the average Nu between left and right cylinders is about 11%. Findings display that the enhancement in Nu due to the large spacing size between cylinders as compared with those of low spacing size is about 35%. The variations of Nu display the opening vents ratio, Re, $S$, and $\mathit{Ri}$ have an extreme action on the characteristics of flow and temperature fields.