Study on Dynamic Characteristics of Single Droplet Impingement on Heated Liquid Film

Wu, Han; Liu, Cong; Cen, Chunze; Huang, Chien-Er; Lin, Shio‐Jean

doi:10.4209/aaqr.220366

Cited by 2 publications

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“…In the context of the impact of a single droplet on a quiescent liquid film, the research results primarily focus on three aspects. One part involves the qualitative analysis of droplet morphologies captured through high-speed photography. − The observed patterns encompass splashing, jet sheet, crown, vortex, bubble entrapment, and droplet rebound. The second part entails the quantitative analysis of morphological features and heat transfer characteristics using dimensionless numbers such as the Weber number ( We ), Reynolds number ( Re ), Ohnesorge number ( Oh ), and dimensionless film thickness. − Several general rules have been obtained: in terms of dynamics, most studies found that an increase in droplet impact velocity leads to increases in the height and radius of the crown, and within a specific threshold, a rise in film thickness leads to an elevated crown height, but surpassing the threshold causes the opposite effect, with a higher film thickness leading to a decrease in crown radius.…”

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confidence: 99%

Heat Transfer and Dynamic Characteristics in Double Droplets’ Impact on Radially Flowing Liquid Film

Shan,

Hu,

Zheng

et al. 2024

Ind. Eng. Chem. Res.

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The process of droplet simultaneous impact and successive impact on the radial flow liquid film is investigated by three-dimensional numerical simulations. The effects of droplet horizontal spacing, vertical spacing, impact velocity, and jet flow rate on the interface evolution characteristics, temperature distribution, and convective heat transfer coefficient distribution are analyzed in detail. The results show that for the simultaneous impact of double droplets on the radial film, a clear middle crown wall is observed in the impact crater. Within a certain range, increases in the jet flow rate and droplet horizontal spacing enhance the cooling effect of the film and expand the area with a high heat transfer coefficient. Despite the fact that the heat transfer coefficient decreases slightly with the increase of impact velocity, the effect brought by impact velocity is not significant. In successive impacts, distinct primary and secondary crowns are produced. For heat transfer characteristics, increasing the jet flow rate increases the heat transfer area and the maximum heat transfer coefficient, but the droplet vertical spacing shows the opposite effects. With regard to the impact velocity, it still demonstrates no remarkable effect on the heat transfer coefficient. The present study provides a fundamental understanding of spray cooling involving multiple droplets' impact on liquid film.

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