Natural and forced convection from rotating two tandem cylinders positioned in a cavity

This thesis presents a comprehensive investigation of the mixed convection phenomena from two hot cylinders situated within a vented cavity. The research addresses the intricate interplay between natural convection currents induced by temperature gradients and forced convection effects resulting from the ventilation of the cavity and the cylinder's rotation. Employing computational fluid dynamics (CFD) simulations, the results meticulously examined the resultant flow field and heat transfer rates. The findings reveal a profound influence of the cylinder's rotation on the convective heat transfer mechanisms, leading to enhanced thermal performance. Notably, the venting configuration significantly alters the flow dynamics, facilitating more effective thermal dissipation. In this context, two cylinders with fixed heat fluxes are positioned at the center of ventilated cavity having adiabatic wall. Simulations have been conducted for scenarios where the cylinders remain stationary or rotate continuously in the same or opposing directions. Furthermore, the effect of variations the space between the cylinders on thermal performance and flow structures have been explored. Reynolds number and Grashof number vary from 100 to 300 and from 103 to 105 , respectively. The results showed that rotating the cylinders significantly improves the heat transfer rate through the cylinders. Upon rotation of the cylinders, an enhancement in heat transfer of approximately 21% is observed for the first cylinder, while the second cylinder exhibits an improvement of about 90%. Keywords: Cavity, Cylinders, Mixed convection, Natural convection, Forces convection