Forced convection from a straight elliptical tube

The paper deals with the problem of two-dimensional laminar forced convection heat transfer from a straight isothermal tube of elliptic cross-section placed in a uniform stream. The study is based on numerical solutions of the conservation equations of mass, momentum, and energy which covers the entire flow domain including the wake region. The parameters influencing the heat transfer process are essentially the Reynolds number, Re, the tube geometry represented by its minor to major axis ratio, Ar, and the angle of inclination, lambda. The study focuses on the effect of Re, Ar, and lambda, on the heat transfer process in the range of Re from 20 to 500. The study reveals that the rate of heat transfer reaches its maximum when lambda, = 0 degrees while the minimum occurs when lambda = 90 degrees. The results also show that smaller axis ratio gives higher heat transfer rate when lambda = 0 degrees. The local Nusselt number and surface vorticity distributions are plotted for a number of cases and the effect of vortex shedding on the overall fate of heat transfer is briefly discussed.