平らな壁面に垂直に噴出する二次元噴流の中にある微粒子と壁面の衝突

概要

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The motion of particles in a two-dimensional impinging jet is studied numerically. The fluid is assumed to be ideal. The motion of particles is governed by three dimensionless parameters: the Stokes number, the aspect ratio (the ratio of the distance between the nozzle and the wall to the half width of the nozzle) and the initial position of the particles. The critical conditions at which the particles first collide with the wall are obtained in the form of the function of these three parameters. The collision characteristics, namely, the location of collision, the collision frequency, the collision velocity and the force exerted on the wall due to collision, etc., are obtained. When the aspect ratio is larger than about 5, the collision characteristics are identified with those for the case of infinite aspect ratio. When the aspect ratio is smaller than about 1.3, no particle collides with the wall in regions near the stagnation point, and the locations of collision are focused at a point apart from the stagnation point. In the case where the distance between the nozzle and the wall is small, whether the particle collides with the wall or not is determined by the behavior of particles on the streamline, which do not pass through the stagnation point.
一般社団法人日本機械学会の論文
1991-09-25