D231 微細気泡混入系の旋回流れにおける流動特性と気泡挙動

概要

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An investigation was carried out for swirling flow in a suddenly expanded and contracted pipe with highly viscous fluid containing micro-bubbles (nominal size of the bubble is 150μm) experimentally and numerically. Fluid containing micro-bubbles enters from stationary pipe section to rotating pipe section and leaves through outlet stationary pipe section. In the numerical analysis flow equations were solved without taking in account of the existence of bubbles in the first place. Then, the bubble trajectory is calculated using the resultant flow field with Runge-Kutta method. From experimental results, with an aid of the numerical simulation, it was found that the parabolic surface is formed by some larger bubbles which are caught in orbits of the rotating flow field. It was further known that smaller size bubbles are passing along limited stream lines.
2002-07-23