Erosion of Gaseous Suspension Flow Duct due to Particle Collision. (I). Experimental Determination of Erosion Rate by Individual Collision.:Experimental Determination of Erosion Rate by Individual Collision

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An experimental study is presented on the erosion process caused on the target specimens by solid particle impingement, in which precise quantifications are given as to the dependencies on collision angle and collision velocity. In order to eliminate fluid-dynamic drag force that retards the particles' motion before they impinge upon the targets, the experiments are performed in the vacuum vessel. In the process of erosion, the existence of so-called incubation period is confirmed. Measured exponents of the velocity are considerably smaller than those for the handy application and are rather close to semi-theoretical values of Bitter and Finnie, which suggests that they can be used in the numerical prediction. Regarding the dependency on collision angle, it was found clear discrepancy between the experimental results and predicted one by means of models of Bitter and Finnie as the collision angle increased. For the spherical particles, the cutting erosion actually ceases before the collision angle becomes normal.
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