Abstract
The electrochemical method is applied to the mass transfer measurements in a fully developed turbulent flow in an Isosceles triangular duct with a narrow apex angle. The analysis of the measured fluctuating mass transfer coefficient on a point electrode results in the distribution of turbulent intensity and space correlation coefficient on the side wall of a triangle. In the laminar or transitional region near the apex, a remarkable change in turbulent intensity and space correlation is detected. In addition, even at the fully turbulent region near the base of a triangle, the turbulent characteristics very near the side wall are considerably changed from those of a turbulent round tube flow at the same Reynolds number. The decrease in overall mass transfer coefficient in a triangular duct is qualitatively explained by the change of wall turbulence structure.
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