Meso-scopic liquid exchange model with liquid content dependent adhesion


Liquid_transfer_SP.zipA meso-scopic liquid exchange contact model with liquid content dependent adhesion is attached here. It is implemented as a plug-in for EDEM using the EDEM Applications Programming Interface and is compatible with EDEM CPU and CUDA GPU solvers.

The model is intended for use with meso-scale numerical particles that do not represent physical particles but an element of bulk solid.

The liquid content exchange is based on the instant equilibration of liquid volume fractions at the meso-contact scale as defined in Equation 1 and illustrated in Figure 1. The fundamental assumption of the model is that there is sufficient diffusion and shear mixing below the meso-scale to facilitate the instant equilibration of liquid concentrations in the region of the particle contact. If this condition is not satisfied the model will overestimate the liquid exchange rate.



Figure 1 Liquid exchange for three particle contact


The model also features liquid content dependent adhesion, which is achieved by linear interpolation of the JKR surface energy and the liquid mass fraction from tabular data according to Equations 2 and 3 and as illustrated in Figure 2.

Figure 2 Peak JKR adhesive force as a function of particle liquid contact for a contacting particle pair


EDEM 2023.0

Usage/Installation Instructions

Place the .dll (if running on Windows) or .so (if running on Linux) file, the .cu file and the .txt file in the same folder as the EDEM deck and enable the model under EDEM Creator -> Physics -> Particle-Particle -> Edit contact chain -> Plug-in models.

The preference file specifies the liquid density (kg/m3) and the JKR surface energy (J/m2) corresponding to different particle liquid mass fractions as shown below. The latter needs to be specified in a tabular form with the two columns separated by at least one space character.