Numerical Simulation of Multi-Scale Two-Phase Flows Using a Hybrid Interface-Resolving Two-Fluid Model (HIRES-TFM)

2013 ◽  
Vol 46 (8) ◽  
pp. 517-523 ◽  
Author(s):  
Holger Marschall ◽  
Olaf Hinrichsen
Keyword(s):  
Numerical Simulation ◽  
Fluid Model ◽  
Two Phase Flows ◽  
Two Phase ◽  
Multi Scale ◽  
Two Fluid Model ◽  
Hybrid Interface ◽  
Two Fluid

Interfacial Pressure Coefficient for Ellipsoids and Its Effect on the Two-Fluid Model Eigenvalues

2016 ◽  
Vol 138 (8) ◽  
Author(s):  
Avinash Vaidheeswaran ◽  
Martin Lopez de Bertodano
Keyword(s):  
Fluid Model ◽  
Pressure Coefficient ◽  
Well Posedness ◽  
Virtual Mass ◽  
Two Phase Flows ◽  
Two Phase ◽  
Pressure Coefficients ◽  
Interfacial Pressure ◽  
Two Fluid Model ◽  
Two Fluid

Analytical expressions for interfacial pressure coefficients are obtained based on the geometry of the bubbles occurring in two-phase flows. It is known that the shape of the bubbles affects the virtual mass and interfacial pressure coefficients, which in turn determines the cutoff void fraction for the well-posedness of two-fluid model (TFM). The coefficient used in the interfacial pressure difference correlation is derived assuming potential flow around a perfect sphere. In reality, the bubbles seen in two-phase flows get deformed, and hence, it is required to estimate the coefficients for nonspherical geometries. Oblate and prolate ellipsoids are considered, and their respective coefficients are determined. It is seen that the well-posedness limit of the TFM is determined by the combination of virtual mass and interfacial pressure coefficient used. The effect of flow separation on the coefficient values is also analyzed.

Numerical Simulation of the Gas-Solid Flow in a Mini-Riser Reactor

2011 ◽  
Vol 396-398 ◽  
pp. 356-360
Author(s):  
Qun Shuai ◽  
Gen Lin Niu ◽  
Hui Zhao ◽  
Qiang Li
Keyword(s):  
Numerical Simulation ◽  
Kinetic Theory ◽  
Solid Phase ◽  
Fluid Model ◽  
Two Phase ◽  
Operational Conditions ◽  
Riser Reactor ◽  
Two Fluid Model ◽  
Two Fluid ◽  
As Solid Phase

The implementation of the kinetic theory for granular flows added strength to the two-phase flow model in the mini-riser. This model uses simulating and calculating commercial software of Fluent to simulate the mini-riser with 0.012m ID and 3m height. Euler-Euler two fluid model was adopted in two dimensional numerical simulation, according to kinetic theory，the solid stress was calculated based on granular temperature and granular viscosity obtained through simulation which could be used to describe the collision between particles. Simulation results, such as solid phase fraction and solid phase velocity, under different operational conditions basically agree well with the experimental measurement.

Numerical simulation of stratified-pattern two-phase flow in gas pipelines using a two-fluid model

2017 ◽  
Vol 88 ◽  
pp. 30-49 ◽  
Author(s):  
Aline Barbosa Figueiredo ◽  
Renan Martins Baptista ◽  
Felipe Bastos de Freitas Rachid ◽  
Gustavo Cesar Rachid Bodstein
Keyword(s):  
Numerical Simulation ◽  
Two Phase Flow ◽  
Fluid Model ◽  
Phase Flow ◽  
Gas Pipelines ◽  
Two Phase ◽  
Two Fluid Model ◽  
Two Fluid
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