The influence of artificial turbulization on the efficiency of heat exchange in the channels of solar air heating collectors

Abstract

This article presents a review and analysis of the results of experiments and theoretical studies on the effect of artificial turbulization on the efficiency of heat transfer in channels. The main factors influencing heat transfer are considered, such as the size and shape of the turbulators, their orientation relative to the direction of flow, as well as the hydrodynamic features of the flow. Empirical relationships for assessing the efficiency of heat transfer are discussed and the results of experiments with various types of turbulators are presented. Directions for further research are proposed, including numerical modeling and optimization of geometric turbulators. Based on the analyses, a method is proposed to obtain an empirical heat transfer formula for SAH with V-shape and metal shavings absorbers. Based on the principle of superposition, an analytical expression is derived to calculate the efficiency of solar absorbers made of metal shavings and a Vshaped surface compared to a smooth surface.