Abstract
In this paper, we study the liquid transport between particles of different sizes, as well as build a dynamic liquid bridge model to predict liquid transport between these two particles. Specifically, the drainage process of liquid adhering to two unequally-sized, non-porous wet particles is simulated using direct numerical simulations (DNS). Same as in our previous work (Wu et al., AIChE Journal, 2016, 62:1877–1897), we first provide an analytical solution of a proposed dynamic liquid bridge model. We find that such an analytical solution also describes liquid transport during collisions of unequally-sized particles very well. Finally, we show that our proposed model structure is sufficient to collapse all our direct numerical simulation data. Our model is hence able to predict liquid transport rates in size-polydisperse systems for a wide range of parameters.
Highlights
Granular particle beds are usually composed of particles with different properties
We provide a model for the prediction of dynamic liquid-bridge formation between particles of different sizes, by assuming a quasi-static flow situation which is based on the assumption that particle relative motion does not affect the liquid bridge formation
A liquid transport model between wet particles of different size has been presented in this paper
Summary
Granular particle beds are usually composed of particles with different properties (i.e., shape, size, density, etc.[1]). It is well known that particle-size polydispersity and shape significantly influence the transport of mass and liquid in a fluidized bed [1,2] and spouted beds system [3]. Bi-and polydisperse fluidized bed systems often show a greater mixing performance [4,5,6,7]. The question arises how polydispersity affects wet fluidized beds, i.e., threephase systems in which a thin liquid layer (or droplets) is present on the particles’ surface. In these systems two additional complications arise: (i) the prediction of the amount of liquid in each liquid bridge, and (ii) the magnitude of cohesive forces due to these bridges
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