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Direct numerical simulation of a hydrodynamic interaction between settling particles and rising microbubbles

Srdjan Sasic (Institutionen för tillämpad mekanik, Strömningslära) ; Ebrahim Karimi Sibaki (Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik) ; Henrik Ström (Institutionen för tillämpad mekanik, Strömningslära)
European journal of mechanics. B, Fluids (0997-7546). Vol. 43 (2014), p. 65-75.
[Artikel, refereegranskad vetenskaplig]

We present in this paper a framework for Direct Numerical Simulation (DNS) of flows involving non-deformable (solid particles and spherical bubbles) and deformable (bubbles and droplets) moving objects suspended in a fluid (liquid or gas). The simulation framework is based on solving a shared set of momentum equations for the phases involved. Special care is taken to adapt the method for simulating solid particles in a flow. We first validate the framework with a series of well-established results from the literature. Then, we demonstrate its capabilities by investigating the influence of relevant parameters (e.g. shape of the bubble, particle density and the separation distance) on the behaviour and interaction of deformable and non-deformable objects in the flow. The suggested framework successfully reproduces both the particle-bubble attachment when the initial horizontal distance between their centres is small, and that the particle passes the bubble without attaching when this distance is large. Furthermore, we show that the probability of a successful attachment decreases if the bubble Eötvös and Morton numbers are substantially larger than unity. Finally, we demonstrate the capability of the proposed method to handle flow situations that involve a simultaneous presence of both multiple solid particles and multiple deformable objects.

Nyckelord: Direct Numerical Simulation (DNS), Volume of Fluid (VOF), bubbles, solid particles, droplets

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Denna post skapades 2013-08-09. Senast ändrad 2015-05-08.
CPL Pubid: 180977


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Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Strömningslära
Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik (2005-2014)


Strömningsmekanik och akustik

Chalmers infrastruktur

C3SE/SNIC (Chalmers Centre for Computational Science and Engineering)