Experimental investigation of heat transfer on trapezoidal channel with three passes

Abstract

In this study, we investigated the change of the heat transfer coefficient on the surface with the TLC method on a blade model with three-pass channel. It is seen that the Reynolds number effects, speed distribution in the channel and heat transfer coefficient distribution differ as a result of the geometry of the parts' transition. In the experimental studies, comparison of circular- and square-holed transition parts of 20 m(3) h(-1) and 30 m(3) h(-1) flow experiments shows that although the channel with three passes has been found to have a more homogenous heat relay, the square hole used for the part of the transition with three-pass channels has access to the higher heat occurring compared to the circular-holed transition piece. In the 40 m(3) h(-1) and 50 m(3) h(-1) value experiments, the circular-holed transition piece used had the higher heat transfer coefficient in the channel and a more homogeneous distribution of the heat transfer was observed.