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Collision dynamics of a water droplet impinging on a hot solid surface
Author(s) -
Hatta Natsuo,
Fujimoto Hitoshi,
Yokotani Torahiko
Publication year - 1998
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199805576
Subject(s) - leidenfrost effect , reynolds number , solid surface , weber number , collision , mechanics , thermodynamics , chemistry , physics , heat transfer , chemical physics , heat transfer coefficient , computer security , computer science , nucleate boiling , turbulence
The collision dynamics of a water droplet impacting on a solid surface heated above the Leidenfrost temperature are treated in this paper. Emphasis is placed upon the droplet disintegration process and the effects of the Reynolds number, as well as the solid surface temperature, on the droplet deformation process. As a result, it has been found that, for the case of low Weber number, but above the critical one, the droplet breaks up into some parts in the recoiling process and that as the Weber number is increased further, the droplet disintegration occurs in a spreading process. It has been confirmed that the effect of the Reynolds number on the droplet deformation is negligibly small in the earlier stage, but a little significant in the later stage just before/after rebounding from the surface. Furthermore, it has been clarified that there is almost no effect of the surface temperature, or the Reynolds number, on the maximum spreading diameter, the time needed for the spreading droplet to reach a maximum diameter, and the time from the moment of collision to rebounding from the surface.