Oblique impact of droplet on a moving film in spray cooling

Yanzhen Wu; Bo Kong; Baohong Tong; Yiting Xiao; Guotao Zhang; Xiaolei Hu

doi:10.1016/j.euromechflu.2023.02.002

Oblique impact of droplet on a moving film in spray cooling

Yanzhen Wu, Bo Kong^*, Baohong Tong^*, Yiting Xiao, Guotao Zhang, Xiaolei Hu

^*Corresponding author for this work

Chemical Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

A simulation study of droplet impingement on a moving film at different incidence angles in spray cooling application was conducted, and the following results were found: the variation of the angle leads to alternating changes in the neck pressure difference, flow field, and maximum shear which directly causes the transition of the coronal morphology from asymmetric to symmetric and finally back to an asymmetric shape, with corresponding changes in the order of appearance of the left and right jets and secondary droplets. After focusing on temperature distribution and heat flux variation, the temperature distribution is found to be related to horizontal and vertical component velocities of the droplet; the angle affects the heat flux variation at the impact point, and the maximum heat flux decreases with the interaction of the liquid film and droplet, which tends to move downstream. Therefore, the morphological characteristics and temperature distribution are asymmetric when a difference is found between the horizontal velocity of the droplet and the film velocity, and the larger the difference, the more evident the asymmetry is. Therefore, the cooling effect is best, and the shear stress is most significant when the liquid film’s and droplets’ horizontal velocities are equal.

Original language	English
Pages (from-to)	21-36
Journal	European Journal of Mechanics, B/Fluids
Volume	100
DOIs	https://doi.org/10.1016/j.euromechflu.2023.02.002
State	Published - 1 Jul 2023

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10.1016/j.euromechflu.2023.02.002

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@article{14592842e5334485ac07bf2f285bc67d,

title = "Oblique impact of droplet on a moving film in spray cooling",

abstract = "A simulation study of droplet impingement on a moving film at different incidence angles in spray cooling application was conducted, and the following results were found: the variation of the angle leads to alternating changes in the neck pressure difference, flow field, and maximum shear which directly causes the transition of the coronal morphology from asymmetric to symmetric and finally back to an asymmetric shape, with corresponding changes in the order of appearance of the left and right jets and secondary droplets. After focusing on temperature distribution and heat flux variation, the temperature distribution is found to be related to horizontal and vertical component velocities of the droplet; the angle affects the heat flux variation at the impact point, and the maximum heat flux decreases with the interaction of the liquid film and droplet, which tends to move downstream. Therefore, the morphological characteristics and temperature distribution are asymmetric when a difference is found between the horizontal velocity of the droplet and the film velocity, and the larger the difference, the more evident the asymmetry is. Therefore, the cooling effect is best, and the shear stress is most significant when the liquid film{\textquoteright}s and droplets{\textquoteright} horizontal velocities are equal.",

author = "Yanzhen Wu and Bo Kong and Baohong Tong and Yiting Xiao and Guotao Zhang and Xiaolei Hu",

year = "2023",

month = jul,

day = "1",

doi = "10.1016/j.euromechflu.2023.02.002",

language = "英语",

volume = "100",

pages = "21--36",

journal = "European Journal of Mechanics, B/Fluids",

issn = "0997-7546",

publisher = "Elsevier BV",

}

TY - JOUR

T1 - Oblique impact of droplet on a moving film in spray cooling

AU - Wu, Yanzhen

AU - Kong, Bo

AU - Tong, Baohong

AU - Xiao, Yiting

AU - Zhang, Guotao

AU - Hu, Xiaolei

PY - 2023/7/1

Y1 - 2023/7/1

N2 - A simulation study of droplet impingement on a moving film at different incidence angles in spray cooling application was conducted, and the following results were found: the variation of the angle leads to alternating changes in the neck pressure difference, flow field, and maximum shear which directly causes the transition of the coronal morphology from asymmetric to symmetric and finally back to an asymmetric shape, with corresponding changes in the order of appearance of the left and right jets and secondary droplets. After focusing on temperature distribution and heat flux variation, the temperature distribution is found to be related to horizontal and vertical component velocities of the droplet; the angle affects the heat flux variation at the impact point, and the maximum heat flux decreases with the interaction of the liquid film and droplet, which tends to move downstream. Therefore, the morphological characteristics and temperature distribution are asymmetric when a difference is found between the horizontal velocity of the droplet and the film velocity, and the larger the difference, the more evident the asymmetry is. Therefore, the cooling effect is best, and the shear stress is most significant when the liquid film’s and droplets’ horizontal velocities are equal.

AB - A simulation study of droplet impingement on a moving film at different incidence angles in spray cooling application was conducted, and the following results were found: the variation of the angle leads to alternating changes in the neck pressure difference, flow field, and maximum shear which directly causes the transition of the coronal morphology from asymmetric to symmetric and finally back to an asymmetric shape, with corresponding changes in the order of appearance of the left and right jets and secondary droplets. After focusing on temperature distribution and heat flux variation, the temperature distribution is found to be related to horizontal and vertical component velocities of the droplet; the angle affects the heat flux variation at the impact point, and the maximum heat flux decreases with the interaction of the liquid film and droplet, which tends to move downstream. Therefore, the morphological characteristics and temperature distribution are asymmetric when a difference is found between the horizontal velocity of the droplet and the film velocity, and the larger the difference, the more evident the asymmetry is. Therefore, the cooling effect is best, and the shear stress is most significant when the liquid film’s and droplets’ horizontal velocities are equal.

U2 - 10.1016/j.euromechflu.2023.02.002

DO - 10.1016/j.euromechflu.2023.02.002

M3 - 文章

SN - 0997-7546

VL - 100

SP - 21

EP - 36

JO - European Journal of Mechanics, B/Fluids

JF - European Journal of Mechanics, B/Fluids

ER -

Oblique impact of droplet on a moving film in spray cooling

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