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MASS TRANSFER AND ADVANCE OF REATTACHMENT POINT DUE TO THE BUBBLE AGITATION ON THE BACKWARD FACING STEP FLOW

Goon Cherl Park
Department of Nuclear Engineering, Seoul National University, Shillim-Dong, Gwanak-Gu, Seoul 151-742, Korea

Hyuk Kwon
Department of Nuclear Engineering, Seoul National University, Seoul, South Korea

Dong Un Seo
Department of Nuclear Engineering, Seoul National University, Seoul, South Korea

Abstract

The variation of both separation and reattachment points is investigated numerically on the back-ward facing step flow. The effect of bubble agitation delays these points in comparison with those of single phase flow. The increment of turbulent shear stress due to the effect cause to the delayment of the points that were made by the adverse pressure gradient from the concave shape. Flow Accelerated Corrosion (FAC) is determined by two parameters - mass transfer coefficient, the characteristics of corrosion. The flow around separation or reattachement produces the strong turbulent kinetic energy and dissipation rate, so that occurs to the abrupt thickness variation of boundary layer. These characteristics affect the rate and the generation point of FAC and change the mass transfer coefficient.

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