Investigation of heat transfer and flow characteristics of laminar continuous flow around tandem square cylinders

In this study the effects of laminar continuous flow on heat transfer and flow characteristics around two square cylinders were investigated numerically for different flow speeds and gap values. Two-dimensional Navier - Stokes and energy equations were solved using the ANSYS-CFX 14.5 program. At first, studies involving single and two square cylinder analyzes were verified in the literature. Subsequently, mesh independence study was performed for the verification of the analysis. In the study, the analyzes were carried out for constant blockage ratio (β=B/H=0,8), five different Reynolds numbers (Re: 10 - 20 - 30 - 40 - 50) and twelve different gap values (GAP: 0,25B - 0,5B - 0,75B - 1B - 1,25B - 1,5B - 1,75B - 2B - 2,5B - 3B - 4B). As the analysis results, the average heat transfer coefficient and the Nusselt number change for each square cylinder surface were investigated. Re-circulation lengths for upstream and downstream cylinders were calculated for different parameters. The variation of static pressure, heat transfer coefficient and surface shear stresses for the front, top and back surfaces of upstream and downstream cylinders were also investigated in this study. As a result, the increase in the Reynolds number led to an increase in both the upstream and downstream cylinders for all parameters. The flow characteristics for the upstream cylinder did not change much with the increase in the gap between the cylinders. For downstream cylinders, the flow characteristics varied from about 1.75 B to 2B range. After this gap value, downstream cylinder shows and independent behavior like upstream cylinder.