固体表面への高速液滴衝突過程の数値解析 : キャビテーション気泡発生の検討(流体工学,流体機械)  [in Japanese] Numerial Analysis on High-Speed Droplet Impact on a Solid Surface : Study on Cavitation Inception(Fluids Engineering)  [in Japanese]

Our experimental results [T. Sanada, et. al., ASME-FEDSM 2007-37129] showed that spraying relatively low pressure stream (0.1MPa-0.2MPa), mixed with super-purified water in the nozzle, on a solid surface, caused harsh erosion. We turned our attention to the occurrence of a strong focused rarefaction wave in the middle of the droplet, possibly cavitation. Experimental results that the degrees of the erosion are heavily dependent on temperature also may support the existence of cavitation. We numerically studied the dynamics of high speed liquid droplet impacts on a solid surface by solving the Euler equation of gas-liquid two phase compressible flow. We discuss the possibility of cavitation as the primary cause of the experimentally observed harsh erosion on the solid surface.