Energy-efficient surface of air capacitors with inclined single-row oval-trench dimples and protrusions

Abstract

Abstract Heat transfer enhancement in the interfin space of an air capacitor due to the use of a package of in-line oval-trench dimples inclined at an angle of 45° to the incoming flow at Re=103 is numerically simulated. When considering a narrow channel of 1 in height, 80 in length and 4 in width, the case of 31 single-row oval-trench dimples of 0.25 depth is the best. The growth of hydraulic losses does not exceed 46% at an almost 2-fold increase in heat transfer in comparison to the plane-parallel channel.