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

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

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 languageEnglish
Pages (from-to)21-36
JournalEuropean Journal of Mechanics, B/Fluids
Volume100
DOIs
StatePublished - 1 Jul 2023

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