Collision efficiency of non-Brownian spheres in a simple shear flow - the role of non-continuum hydrodynamic interactions

Article Physics, Fluids & Plasmas

Brownian coagulation of like-charged aerosol particles

Pijush Patra et al.

Summary: This paper investigates the coagulation rate of like-charged Brownian spherical particles dispersed in a gaseous medium, taking into account the influence of noncontinuum lubrication resistances and attractive electrostatic interactions between conducting particles.

PHYSICAL REVIEW FLUIDS (2022)

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Article Physics, Fluids & Plasmas

Bifurcations in droplet collisions

A. Dubey et al.

Summary: This article reveals the complex dependency in droplet collision dynamics through bifurcation analysis, and predicts the strong spatial clustering near certain saddle points.

PHYSICAL REVIEW FLUIDS (2022)

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Article Mechanics

Collision rate of bidisperse spheres settling in a compressional non-continuum gas flow

Johnson Dhanasekaran et al.

Summary: The study examines collisions in a dilute polydisperse suspension of spheres interacting through non-continuum hydrodynamics in a slow uniaxial compressional flow, and reveals the complex behavior of collision rates influenced by the interplay between gravity and hydrodynamic interactions.

JOURNAL OF FLUID MECHANICS (2021)

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Article Mechanics

Collision rate of bidisperse, hydrodynamically interacting spheres settling in a turbulent flow

Johnson Dhanasekaran et al.

Summary: This study investigates collisions in a dilute polydisperse suspension of sub-Kolmogorov spheres in a turbulent flow, revealing a significant decrease in ideal collision rate in the absence of gravity. The collision efficiency is influenced by the relative strength of differential sedimentation and turbulent shear, with hydrodynamic interactions playing a crucial role in determining the collision rate. An analytical approximation is developed to succinctly report computed results, which could be essential for predicting the evolution of size distribution in various applications.

JOURNAL OF FLUID MECHANICS (2021)

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Article Mechanics

Non-continuum tangential lubrication gas flow between two spheres

Melanie Li Sing How et al.

Summary: This study investigates the non-continuum effects of lubrication forces and torques between two particles, providing a comprehensive formulation for hydrodynamic interactions at all separations. It applies to the classic case of a particle settling parallel to a vertical wall, predicting a finite settling speed at contact instead of vanishing speed as predicted by the continuum model.

JOURNAL OF FLUID MECHANICS (2021)

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Review Engineering, Chemical