Experimental study on thermal mixing related to eddy structure in T-junction

Tanaka, Masaaki  ; Kurokawa, Koji*; Takita, Hiroki*; Monji, Hideaki*

In this study, a simplified T-junction piping system consisting of a rectangular duct for main stream and a circular pipe for branch stream was used as the test section. Time series of instantaneous pictures in two-dimensional velocity vector field were obtained by PIV technique. And fluid temperature fluctuations at 2 mm inside from the wall were also measured by thermo-couples. Focusing on the frequency characteristics, formation of eddy structure in the mixing area and mutual relation between the temperature fluctuation generation and the flow structure were discussed.