CFD Approaches for Modeling Gas-Solids Multiphase Flows - A Review

Abstract

This review study focuses on the application of Computational Fluid Dynamics (CFD) in the investigation of gas-solids multiphase flow systems. The applicability and limitations of conventional models and recent developments of existing multiphase models for the prediction of gas-solids flows are thoroughly overviewed. Use of conventional Eulerian-Eulerian model for granular flows and Lagrangian approach incorporated with Discrete Element Method (CFD-DEM) are quite well proven, however some limitations restrict the use of these models in wide range of applications. Therefore, some new models have been introduced to model gas-solids flows, as example Dense Discrete Phase Model incorporated with Kinetic Theory of Granular Flow (DDPM-KTGF), Dense Discrete Phase Model incorporated with Discrete Element Method (DDPM-DEM) and Computational Particle Fluid Dynamics (CPFD) numerical scheme incorporated with the MultiPhase-Particle-In-Cell (MP-PIC) method. These models have been validated for certain applications under certain conditions, however, further validation of these models is still a necessity.

Modeling and Performance Analysis of Biomass Fast Pyrolysis in a Solar-Thermal Reactor

“…In order to take into consideration the high turbulence arising from the flow fluctuation (gas vortices), especially near the separator, the above momentum equations have been coupled with the standard two-equation k –ε model with wall function as proposed by Launder and Spalding . This model is widely used and reported to provide reasonable agreement with experimental measurements in various forms of intermediate to dilute flow systems such as circulating fluidized beds and pneumatic conveyers. − Compared to other optional models available in Fluent simulation platform, the k –ε model has also been found to be computationally stable and robust for the scale of problem considered here.…”

Pengaruh Thermal Wall Terhadap Karakteristik Hidrodinamika Dan Karakteristik Syngas Pada Dual Fluidized Bed Gasifier Berbabahan Bakar Tempurung Kelapa Dengan Simulasi Berbasis CPFD

“…MP-IC adalah model yang berbasis Eulerian-Lagrangian dengan memetakan partikel yang memiliki kesamaan properti dalam satu parcel. Saat masuk ke grid parcel diperlakukan sebagai kontinum sebagaimana sifat fluida dan keluar dari grid parcel dikembalikan lagi sebagai partikel tunggal [19]. Pertama kali diperkenalkan oleh Andrews dan O'Rourke (1996), metode MP-IC merupakan pengembangan dari metode stochastic particle KIVA code [20].…”

A parametric study for Euler-Granular model in dilute phase vertical pneumatic conveying

“…Computational Fluid Dynamics (CFD) modelling is an advanced tool to study the various aspects of pneumatic conveying characteristics [2]. Different model approaches are available for the prediction of gas-solids multi-phase flow systems and the Euler-Granular method is one of those model approaches [3]. This model is an Eulerian-Eulerian approach where the both gas and solid phases are treated as continua.…”

“…The volume fraction representation, steady state continuity equation and momentum equation for the gas phase are presented by eqns (1)- (3). The equations for the particle phase can be written in a similar manner.…”