Numerical Simulation for Conjugated Heat Transfer in Concentric Tube Recuperator with Longitudinal Fins

摘要

In this paper, a conjugated heat transfer problem of conduction and convection in the concentric tubes with longitudinal fins was studied by means of numerical simulation. 3D temperature and fluid flow fields were simulated for three-split concentric tube recuperator with longitudinal fins for laminar fluid flow. The numerical simulation results show that the ratio of Q_(conduction)/Q_(total)×100%, which is the function of the angle of fins and axis, and solid thermal conductivity, decreases quickly as longitudinal length increases. If the conduit is long enough, the ratio of Q_(conduction)/Q_(total)×100% can be neglected. The ratio of Nusselt number and the ratio of friction factor increase as the angle of fins and axis increases, and the ratio of Nusselt number increases more quickly than that of the friction factor for the same angle.