Effect of long-range Coulomb repulsion on adhesive particle agglomeration in homogeneous isotropic turbulence

Ruan, Xuan; Chen, Sheng; Li, Shuiqing

doi:10.1017/jfm.2021.127

Cited by 13 publications

(1 citation statement)

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“…In addition to neutral particles, particles in nature could easily get charged after moving through ionized air (Marshall & Li 2014;van Minderhout et al 2021) or encountering collisions (Lee et al 2015). The resulting electrostatic interaction could significantly modulate the fundamental particle dynamics in turbulence, such as clustering, dispersion and agglomeration (Karnik & Shrimpton 2012;Yao & Capecelatro 2018;Ruan, Chen & Li 2021;Boutsikakis, Fede & Simonin 2022;Zhang, Cui & Zheng 2023). For identically charged particles, it has been shown that the Coulomb repulsion could effectively repel close particle pairs and mitigate particle clustering.…”

Section: Introductionmentioning

confidence: 99%

Effects of electrostatic interaction on clustering and collision of bidispersed inertial particles in homogeneous and isotropic turbulence

Ruan,

Gorman,

2024

J. Fluid Mech.

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In sandstorms and thunderclouds, turbulence-induced collisions between solid particles and ice crystals lead to inevitable triboelectrification. The charge segregation is usually size dependent, with small particles charged negatively and large particles charged positively. In this work, we perform numerical simulations to study the influence of charge segregation on the dynamics of bidispersed inertial particles in turbulence. Direct numerical simulations of homogeneous isotropic turbulence are performed with the Taylor Reynolds number ${Re}_{\lambda }=147.5$ , while particles are subjected to both electrostatic interactions and fluid drag, with Stokes numbers of 1 and 10 for small and large particles, respectively. Coulomb repulsion/attraction is shown to effectively inhibit/enhance particle clustering within a short range. Besides, the mean relative velocity between same-size particles is found to rise as the particle charge increases because of the exclusion of low-velocity pairs, while the relative velocity between different-size particles is almost unaffected, emphasizing the dominant roles of differential inertia. The mean Coulomb-turbulence parameter, ${Ct}_0$ , is then defined to characterize the competition between the Coulomb potential energy and the mean relative kinetic energy. In addition, a model is proposed to quantify the rate at which charged particles approach each other and to capture the transition of the particle relative motion from the turbulence-dominated regime to the electrostatic-dominated regime. Finally, the probability distribution function of the approach rate between particle pairs is examined, and its dependence on the Coulomb force is further discussed using the extended Coulomb-turbulence parameter.

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