Interface‐resolved simulations of normal collisions of spheres on a wet surface

Abstract

Detailed knowledge of micromechanics of individual particle collisions with the presence of liquid is crucial for modelling/understanding of wet granular flows that are omnipresent in nature and industrial applications. Despite many reported studies, very limited detailed interface‐resolved modeling of such collision problems has been conducted. This article presents an improved model for direct numerical simulations of normal impacts of spheres on wet surfaces. This model combines the immersed boundary method and the volume‐of‐fluid method supplemented with a model describing gas‐liquid‐solid contact line. It is demonstrated that our model not only correctly describes the collision dynamics of wet particles, but also well captures the dynamics of the liquid bridge formed during the collision. Quantitative agreement is obtained between the simulation results and the experimental data. It is concluded that the developed model constitutes a powerful tool to complement experimental studies, which are challenging for more complex wet collision systems in practice. © 2017 American Institute of Chemical Engineers AIChE J, 2017

Numerical investigation of collision dynamics of wet particles via force balance

“…The results of CoR agree well with experiments, however the formation of the liquid bridge did not. Hence, Tang et al (2017) extended this VOF/IB model by further implementing a tensile force model and a contact model. This led to a much better agreement between model and experiments regarding the overall collision dynamics including liquid bridge shape and lifetime as well as the dependence of the CoR on several parameters (collision velocity, layer thickness, liquid viscosity, surface tension).…”

Insights into the Impact of Small Particle Liquid Film on the Spatiotemporal Distribution of Suspension in Stirred Reactors

“…While the Coefficient of Restitution results correlated well with experiments, the model faced challenges in accurately representing the formation of the liquid bridge. Subsequently, Tang et al extended this VOF/IB model by incorporating a tensile force model and a contact model to address these limitations. Yuan et al employed the Euler–Euler two-fluid model (TFM) in conjunction with the Kinetic Theory of Granular Flow (KTGF) method, introducing a model for the dynamic recovery coefficient of wet particles that considers the impact of liquid film.…”

Hydrodynamics and mechanism of hydrophobic foam column tray: Contact angle hysteresis effect

“…Many emerging studies have emphasized the interfacial wettability effects on multiphase transport processes. Specifically, interfacial wettability effects have been investigated in terms of fluid dynamics (drag reduction and wet particle collision), hydrodynamics (membrane bubbling and sieve tray), heat transfer and anti‐icing, oil recovery, oil–water separation, micro‐reactor technology, and so forth.…”