Numerical prediction for laminar forced convection heat transfer in parallel-plate channels with streamwise-periodic rod disturbances

A numerical study has been performed for the periodically fully-developed f low in two-dimensional channels with streamwise-periodic round disturbances on its two walls. To accurately describe the round disturbance boundary co ndition, a body fitted grid was used. The flow and heat transfer have been studied in the range of Reynolds number, Re = 50-700, and Prandtl number Pr = 0.71. The influences of disturbance parameters and Reynolds number on he at transfer and friction have been investigated in detail. Some of the solu tions have been examined using both steady and unsteady finite difference s chemes; and the same results have been obtained. The results show that diff erent flow patterns can occur with different deployments of the disturbance s. With appropriate configuration of the disturbances, the Nusselt number c an reach a value four times greater than in a, smooth channel at the same c ondition, with the penalty of a much greater pressure drop. On the other ha nd, if the disturbances are not deployed properly, augmentation of heat tra nsfer cannot be acquired. (C) 1998 John Wiley & Sons, Ltd.