Peculiarities of studying thermohydraulic characteristics of relief surfaces

The results of experimental study of the thermohydraulic characteristics of a relief surface covered with a vortex-forming relief (a massive of dimples) are presented. It has been shown that, when carrying out the experiments, the prehistory of the flow should be taken into account and that it is necessary to determine the heat exchange and friction parameters in a single experiment not only on the vortex-forming relief; i.e., it is necessary to carry out a comparative experiment by measuring the corresponding characteristics of a smooth surface.