A numerical study of impact force caused by liquid droplet impingement onto a rigid wall

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.

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Dry granular avalanche impact force on a rigid wall of semi-infinite height

EPJ Web of Conferences ◽

10.1051/epjconf/201714003054 ◽

2017 ◽

Vol 140 ◽

pp. 03054 ◽

Cited By ~ 3

Author(s):

Adel Albaba ◽

Stéphane Lambert ◽

Thierry Faug

Keyword(s):

Impact Force ◽

Rigid Wall ◽

Infinite Height ◽

Granular Avalanche

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Numerical analysis on the wall-thinning rate of a bent pipe by liquid droplet impingement erosion

Engineering Failure Analysis ◽

10.1016/j.engfailanal.2016.01.005 ◽

2016 ◽

Vol 62 ◽

pp. 306-315 ◽

Cited By ~ 2

Author(s):

Nobuyuki Fujisawa ◽

Keitaro Wada ◽

Takayuki Yamagata

Keyword(s):

Numerical Analysis ◽

Liquid Droplet ◽

Droplet Impingement ◽

Wall Thinning ◽

Bent Pipe ◽

Thinning Rate ◽

Droplet Impingement Erosion

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Numerical study of the interaction between a pulsating coated microbubble and a rigid wall. I. Translational motion

Physical Review Fluids ◽

10.1103/physrevfluids.6.013601 ◽

2021 ◽

Vol 6 (1) ◽

Author(s):

M. Vlachomitrou ◽

N. Pelekasis

Keyword(s):

Numerical Study ◽

Translational Motion ◽

Rigid Wall

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A numerical study of aerosol influence on mixed-phase stratiform clouds through modulation of the liquid phase

Atmospheric Chemistry and Physics ◽

10.5194/acp-13-1733-2013 ◽

2013 ◽

Vol 13 (4) ◽

pp. 1733-1749 ◽

Cited By ~ 6

Author(s):

G. de Boer ◽

T. Hashino ◽

G. J. Tripoli ◽

E. W. Eloranta

Keyword(s):

Liquid Phase ◽

Mass Fraction ◽

Freezing Point ◽

Numerical Study ◽

Liquid Droplet ◽

Number Concentration ◽

Mixed Phase ◽

Large Variability ◽

Stratiform Clouds ◽

Aerosol Properties

Abstract. Numerical simulations were carried out in a high-resolution two-dimensional framework to increase our understanding of aerosol indirect effects in mixed-phase stratiform clouds. Aerosol characteristics explored include insoluble particle type, soluble mass fraction, influence of aerosol-induced freezing point depression and influence of aerosol number concentration. Simulations were analyzed with a focus on the processes related to liquid phase microphysics, and ice formation was limited to droplet freezing. Of the aerosol properties investigated, aerosol insoluble mass type and its associated freezing efficiency was found to be most relevant to cloud lifetime. Secondary effects from aerosol soluble mass fraction and number concentration also alter cloud characteristics and lifetime. These alterations occur via various mechanisms, including changes to the amount of nucleated ice, influence on liquid phase precipitation and ice riming rates, and changes to liquid droplet nucleation and growth rates. Alteration of the aerosol properties in simulations with identical initial and boundary conditions results in large variability in simulated cloud thickness and lifetime, ranging from rapid and complete glaciation of liquid to the production of long-lived, thick stratiform mixed-phase cloud.

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