STUDY OF SIMULTANEOUSLY DEVELOPING FLOW AND TEMPERATURE FIELD IN RECTANGULAR DUCTS WITH CONSTANT WALL TEMPERATURE

In this research, the heat transfer and flow friction characteristics of hydrodynamically and thermally developing flows at the entrance of rectangular ducts have been theoretically studied. In calculating components of velocity, parabolic momentum equations were used. Temperature field was also determined using parabolic form of energy equation. Besides, pressure distribution was calculated by means of a Poisson equation, which is obtained from combination of momentum and continuity equations. In numerical solution of finite difference equations, Newton-Raphson method was used. Numerical results were presented for channels with 1/3, 2/3 and 3/3 aspect ratio and range of Reynolds number 250 ≤ Re ≤ 2250. Accuracy of the analysis was confirmed by comparing the fully developed Nusselt numbers obtained in this study with the literature