Three-dimensional numerical simulation of drops suspended in Poiseuille flow at non-zero Reynolds numbers

Amireh Nourbakhsh, Saeed Mortazavi, Yaser Afshar

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

A finite difference/front tracking method is used to study the motion of three-dimensional deformable drops suspended in plane Poiseuille flow at non-zero Reynolds numbers. A parallel version of the code was used to study the behavior of suspension on a reasonable grid resolution (128×128×128 grids). The viscosity and density of drops are assumed to be equal to that of the suspending medium. The effect of Capillary number, the Reynolds number, and volume fraction are studied in detail. It is found that drops with small deformation behave like rigid particles and migrate to an equilibrium position about half way between the wall and the centerline (the Segre-Silberberg effect). However, for highly deformable drops there is a tendency for drops to migrate to the middle of the channel, and the maximum concentration occurs at the centerline. The concentration profile obtained across the channel is in agreement with that measured by Kowalewski (T. A. Kowalewski, "Concentration and velocity measurement in the flow of droplet suspensions through a tube," Exp. Fluids 2, 213 (1984)) experimentally for viscosity ratios less than or equal to one. The effective viscosity of suspension decreases with Capillary number in agreement with the creeping flow limit. Also, the effective viscosity increases with the Reynolds number of the flow.

Original languageEnglish (US)
Article number123303
JournalPhysics of Fluids
Volume23
Issue number12
DOIs
StatePublished - Dec 14 2011
Externally publishedYes

Bibliographical note

Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.

Fingerprint

Dive into the research topics of 'Three-dimensional numerical simulation of drops suspended in Poiseuille flow at non-zero Reynolds numbers'. Together they form a unique fingerprint.

Cite this