A fully developed convective heat transfer inside a two-dimensional periodically wavy channel is investigated numerically with pulsating flows under a constant wall temperature. It is based on the SIMPLER(Semi-Implicit Method for Pressure Linked Equations Revised) algorithm in curvilinear body-fitted coordinates.Calculations are performed with Pr=0.7,Re=5~500 on a non-orthogonal non-staggered grid generated by elliptic equations. The effects of pulsatile parameters,such as pulsatile amplitude and frequency on heat transfer and flow friction,are studied.It shows that the vortice sweeping,diminishing and growing up due to pulsating flows enhance fluid pulsating and mixing,and lead to the enhancement of heat transfer.The intensity of heat transfer increases with the increase of Reynolds numbers and amplitudes and is independent of pulsating frequencies.The instantaneous flow resistance and Nusselts numbers present periodical cosine and sine variations, respectively.

The periodically fully developed laminar heat transfer and fluid flow in a two-dimensional wavy channel in a compact heat exchanger are investigated numerically. Calculations are performed at Pr=0.7, in the range of Re=100~1100 with non-orthogonal non-staggered grids. The Semi-Implicit Method for Pressure Linked Equations Revised (SIMPLER) algorithm in the curvilinear body-fitted coordinates is used. The effect of the wavy height and distance on momentum and heat transfer is studied. Performance of model parameters is evaluated. It is shown that the overall Nusseh numbers and friction factors increase with the increase of Reynolds numbers. The friction factors and overall Nusseh numbers increase as increasing the wavy height or decreasing the wavy distance. The overall Nusseh numbers increase significantly with the wavy height, especially at high Reynolds numbers. The best wavy height and distance are 1.15 mm and 13 mm, respectively.