Research on the collision model of high-temperature alumina droplets with cold wall for solid rocket motors

Li, Kang; Li, Jiang; Zhu, Gen; He, Zhipeng

doi:10.1016/j.ast.2023.108126

Cited by 4 publications

(1 citation statement)

References 37 publications

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“…At present, the behavior of droplets colliding with the wall has become a research hotspot in many fields such as rocket propulsion burners, nuclear energy cooling devices, microelectronics heat dissipation, and atomization spraying [1][2][3]. The process of droplet colliding with the wall is usually accompanied by dynamic behaviors such as droplet deformation, rebound, spreading, and splashing fragmentation [4].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Dynamic Behavior Exhibited by Charged Droplets Colliding with Liquid Film

Wang,

Jia,

Yang

et al. 2024

Coatings

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Since droplet collision with walls has become a research hotspot, scholars have conducted a large number of studies on the dynamic behavior of electrically neutral droplets colliding with dry walls. However, with the rapid development of electrostatic spray technology, there is an increasingly urgent need to study the dynamic process of collision between charged droplets and walls. In this paper, considering the actual working conditions of electrostatic spray, an electric field model is introduced based on the two-phase flow field. Through the coupling of a multiphase flow field and electric field and a multiphysics field, the dynamic numerical calculation method is used to explore the collision electrodynamic behavior of charged droplets and liquid film. The dynamic evolution process of the formation and development of the liquid crown in the collision zone was clarified, and the critical velocity and critical Weber number of the rebound, spreading, and splashing of charged droplets were tracked. The distribution characteristics of electrostatic field, pressure field, and velocity field under different working conditions are analyzed, and the dynamic mechanism of the charged droplet collision liquid film under multi-physics coupling is revealed based on the electro-viscous effect. It is confirmed that the external electric field can increase the critical velocity of droplet splashing and fragmentation and promote the spreading and fusion behavior of droplets and liquid films. The influence of the impact angle of charged droplets on the collision behavior was further explored. It was found that the charged droplets not only have a smaller critical angle for fragmentation and splashing, but also have a faster settling and fusion speed.

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