Numerical investigation of heat transfer rate around isothermal elliptical cylinder under pulsating flow

In this study, the effects of frequency and dimensionless amplitude of the pulsating flow on the rate of heat transfer around elliptical cylinders with elliptical ratio of e=0.2 and 0.6 under different angles θ=0°, 30°, 60° and 90° and also for elliptical ratio of e=1 (circular cylinder) has been investigated. For this purpose, the flow around a cylinder with elliptical ratio of e=1 under pulsating and unpulsating flow been solved and then the results of elliptical cylinder under different angles of attack and elliptical ratio compared. So, pulsating flow over the cylinder, in the range of pulsating Strouhal number St=(0.1-2) and dimensionless amplitude of pulsating flow A=0.75 in Reynolds number of Re=100 has been studied. In all cases, elliptical cylinder have fixed temperature more than the temperature of the surrounding fluid. The pulsating flow is a factor that can be effective on the rate of heat transfer, according to results presented in this study, pulsating flow over elliptical cylinder, in some cases can increase the heat transfer rate. But in general, changes in the rate of heat transfer depend on the frequency and dimensionless amplitude of pulsating flow.