Numerical Analysis of Influence of Roughness of Material Surface on High-Speed Liquid Droplet Impingement

Hirotoshi Sasaki, Yuka Iga

研究成果: Article査読

抄録

This study explains why the deep erosion pits are formed in liquid droplet impingement erosion even though the droplets uniformly impinge on the entire material surface. Liquid droplet impingement erosion occurs in fluid machinery on which droplets impinge at high speed. In the process of erosion, the material surface becomes completely roughened by erosion pits. In addition, most material surface is not completely smooth and has some degree of initial roughness from manufacturing and processing and so on. In this study, to consider the influence of the roughness on the material surface under droplet impingement, a numerical analysis of droplets impinging on the material surface with a single wedge and a single bump was conducted with changing offsets between the droplet impingement centers and the roughness centers on each a wedge bottom and a bump top. As results, two mechanisms are predicted from the present numerical results: the erosion rate accelerates and transitions from the incubation stage to the acceleration stage once roughness occurs on the material surface; the other is that deep erosion pits are formed even in the case of liquid droplets impinging uniformly on the entire material surface.

本文言語English
論文番号031404
ジャーナルJournal of Pressure Vessel Technology, Transactions of the ASME
141
3
DOI
出版ステータスPublished - 2019 6 1

ASJC Scopus subject areas

  • 安全性、リスク、信頼性、品質管理
  • 材料力学
  • 機械工学

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