Journal

CFD INVESTIGATION OF MULTIPHASE FLOW BY 

EULERIAN MODEL FOR PLANER SECTION UNDER IMPLICIT CONDITIONS.

Abstract

The aim of this present study was to investigate the effects of multiphase fluid flows in planer section by adopting eulerian – eulerian multiphase flow model. The present work is done on computational fluid dynamics as Fluent was the solver for whole work. Ideal situation for planer section is to be carried out for modeling and simulation and investigation is done on effects of volume fraction on section for defined number of iterations. 2D model of section is developed in fluent and then it is imported into meshing and solver for completing the simulation process. The total number of cells/elements was 398010 with orthogonal grid. Eulerian Multiphase Model was used to predict the vector and the scalar flow profile of liquid-liquid interaction in the planer section. A multiphase flow model of water and air, implicit unsteady profile and segregated flow model together with the laminar model are used in the simulation. Results were obtained in the form contour of volume fraction and velocity vector profile. These results are used to explain the behavior, how flow of fluid spreading water in pipe over time.

Keywords:

Multiphase flow, Eulerian model, Planer T section, Implicit conditions.

Introduction

The term multiphase flow is used to refer to any fluid flow consisting of more than one phase or component. The flows considered some level of phase or component separation at a scale well above the molecular level. This still leaves an enormous spectrum of different multiphase flows. One could classify them according to the tate of the different phases or components and therefore refer to gas/solids flows, or liquid/solids flows or gas/particle flows or bubbly flows and so on. Some treatises are defined in terms of a specific type of fluid flow and deal with low Reynolds number suspension flows, dusty gas dynamics and so on. Others focus attention on a specific application such as slurry flows, cavitating flows, aerosols, debris flows, and fluidized beds and so on. Multiphase flows are also a ubiquitous feature of our environment whether one considers rain, snow, fog, avalanches, mud slides, sediment transport, debris flows, and countless other natural phenomena to say nothing of what happens beyond our planet. Very critical biological and medical flows are also multiphase, from blood flow to semen to the bends to lithotripsy to laser surgery cavitation and so on. No single list can adequately illustrate the diversity and ubiquity. Consequently any attempt at a comprehensive treatment of multiphase flows is flawed unless it focuses on common phenomenological themes and avoids the temptation to digress into lists of observations. Two general topologies of multiphase flow can be usefully identified at the outset, namely disperse flows and separated flows. By disperse flows we mean those consisting of finite particles, drops or bubbles (the disperse phase) distributed in a connected volume of the continuous phase. On the other hand separated flows consist of two or more continuous streams of different fluids separated by interfaces.

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