Comparative analysis of the results of experimental and numerical studies of thermal and hydraulic characteristics of micro-hilly and corrugated plate surfaces

Abstract

The experimental analysis of heat transfer in plate heat exchange channels, presented in this paper, was carried out on the installation of visualizing the temperature distribution on the surface of the electro-heated air flow cooled heat transfer envelope using a thermal camera. Experimental studies were carried out in a wide range of air flow. In the comparative analysis, the average deviation of the experimental values from the numerical simulation for the Nusselt criterion was about 15%. The worst systematic discrepancy between the Euler numbers (excess of the calculated losses over the experiment) is observed for the hydraulic characteristics of the hilly surface, but it does not exceed +22% in the transition region, decreasing to +14% in the region of developed turbulence. Within these errors, it is possible to use numerical 3d calculations for the development of databases of criteria dependences of corrugated and hilly heat exchange surfaces. To calculate the full-size heat exchangers obtained by calculation criterion dependences for different geometric characteristics of the models of corrugated and hilly surfaces are presented.