In this paper, combined influence of swirling flows and orifice biases is investigated by a mass transfer experiment and a numerical simulation. In the mass transfer experiment, pipe wall thinning behind an orifice in a circular pipe is evaluated with benzoic acid instead of steel. In addition, a numerical simulation for velocity and concentration fields is performed to estimate mass transfer behind the orifice. The numerical simulation using the standard k-ε model of turbulence well reproduces the distributions of Keller coefficient behind the orifice, which agree with those of the experiment in no-swirling flows. Experimental results show asymmetric pipe wall thinning is occurred under combined influence of a swirling flow and a slight orifice bias, while a symmetric pipe wall thinning is seen in the no-swirling flows even with the orifice bias.
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