Enhanced Heat Transfer during Oscillatory Flow in Annular Channels

Abstract

Numerical simulations were carried out for heat transfer during oscillatory flow in a circular straight tube with a solid tube in its center. The solid tube was inserted to enhance axial heat transfer by increasing lateral heat transfer effect for high frequency. The results show that the axial heat transfer increases with an increase in the inserted tube diameter. The results also show that the inserted tube materials do not have any substantial effect on the axial heat transfer. The efficiency based on the ratio of heat transfer to the work done becomes larger compared with that in a bundle of circular capillary tubes.