Computational fluid dynamics simulation of adsorption process in a liquid-solids fluidized bed. Issue 4 (August 2021)

• Record Type: Journal Article
• Authors: Ren, Panfeng; Li, Wenbin; Yu, Kuotsung
• Is Part Of: Journal of environmental chemical engineering. Volume 9:Issue 4(2021)
• Publication Date: 2021-08
• Subjects: Liquid-solids fluidized bed (LSFB) -- Computational fluid dynamics (CFD) simulation -- Turbulent mass diffusivity -- Hydrodynamics -- Protein adsorption; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.105428
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: For simultaneously predicting the hydrodynamics and protein adsorption process in a liquid-solids fluidized bed (LSFB), a computational fluid dynamics (CFD) model is established by combining the two-fluid model (TFM) for the liquid-particles two-phase fluidization system with the c 2 ¯ − ε c model for the turbulent mass transfer. In terms of hydrodynamics, the k l − ε l − k p − ε p − Θ equations are adopted to describe phases turbulence. The simulations of hydrodynamics using various drag models and different modelling parameters are conducted to test their sensitivity. Then for the adsorption process, the recently developed formulations of the c 2 ¯ − ε c model are adopted to characterize rigorously the turbulent mass diffusion in LSFB. With the proposed model, the velocity field as well as the concentration field can be acquired. Simulated results are compared with the experimental data and a good agreement between them is found. Graphical Abstract: A computational fluid dynamics (CFD) model is established by combining the two-fluid model (TFM) for the hydrodynamics of liquid-particles with the c 2 ¯ − ε c model for the turbulent mass transfer to simulate the protein adsorption process in the LSFB. In hydrodynamics, the sensitivities of drag models and modeling parameters (particle-particle restitution coefficient e ss and specularity coefficient φ ) on the predictions for different types of particles are discussed. Then for the adsorption process, the recently developed formulations of the c 2 ¯ − ε c model are adopted to characterize rigorously the turbulent mass diffusivity D l, t . ga1 Highlights: A CFD model for simulating the protein adsorption process of a LSFB is established. Simulated results compare favorably with experimental data from the literatures. Predicted breakthrough curves using different turbulent mass diffusion models are discussed. Turbulent Schmidt number is found to be not a constant in the whole LSFB.