Models for the two-phase flow of concentrated suspensions

Tobias Ahnert, Andreas Münch, Barbara Wagner

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


A new two-phase model for concentrated suspensions is derived that incorporates a constitutive law combining the rheology for non-Brownian suspension and granular flow. The resulting model exhibits a yield-stress behaviour for the solid phase depending on the collision pressure. This property is investigated for the simple geometry of plane Poiseuille flow, where an unyielded or jammed zone of finite width arises in the centre of the channel. For the steady states of this problem, the governing equations are reduced to a boundary value problem for a system of ordinary differential equations and the conditions for existence of solutions with jammed regions are investigated using phase-space methods. For the general time-dependent case a new drift-flux model is derived using matched asymptotic expansions that takes into account the boundary layers at the walls and the interface between the yielded and unyielded region. The drift-flux model is used to numerically study the dynamic behaviour of the suspension flow, including the appearance and evolution of an unyielded or jammed regions.
Original languageEnglish (US)
Pages (from-to)557-584
Number of pages28
JournalEuropean Journal of Applied Mathematics
Issue number3
StatePublished - Jun 4 2018
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2022-06-08
Acknowledged KAUST grant number(s): KUK-C1-013-04
Acknowledgements: AM is grateful for the support by KAUST (Award Number KUK-C1-013-04). TA and BW gratefully acknowledges the support by the Federal Ministry of Education (BMBF) and the state government of Berlin (SENBWF) in the framework of the program Spitzenforschung und Innovation in den Neuen Landern ¨ (Grant Number 03IS2151)
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

ASJC Scopus subject areas

  • Applied Mathematics


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