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Modification and extension of a standard volume-of-fluid solver for simulating boiling heat transfer

Kunkelmann, C. and Stephan, Peter (2010):
Modification and extension of a standard volume-of-fluid solver for simulating boiling heat transfer.
In: Proceedings ECCOMAS CFD 2010 — Fifth European Conference on Computational Fluid Dynamics, [Conference or Workshop Item]

Abstract

In the present paper the modifications and extensions of the Volume-of-Fluid solver in the OpenFOAM CFD package for the simulation of boiling flows are presented. The main difficulties in the simulation of boiling flows are high temperature gradients at the liquid-vapor interface and microscopic heat and mass transfer at the 3-phase contact line. As the smeared interface in a pure Volume-of-Fluid method does not allow a precise reconstruction of the interface and thus hinders the accurate determination of the local temperature gradient, the solver is extended by a Level-Set method and a geometric reconstruction method. This facilitates an exact determination of the temperature gradient and of the local evaporation rate. In addition, the solver is extended by a sub-model for the microscale evaporation at the contact line which cannot be resolved on a CFD mesh. The sub-model is coupled to the simulation by adapting the thermal coupling between the solid heating wall and fluid domain. The modifications and the resulting model are validated by simulating phase change in a simple geometry and by simulating the heat and mass transfer during single bubble boiling. Further, the model is applied to perform a 3D simulation with adaptive mesh refinement of a lateral bubble merger. Very good qualitative and quantitative agreement with analytical approaches and experimental observations can be found.

Item Type: Conference or Workshop Item
Erschienen: 2010
Creators: Kunkelmann, C. and Stephan, Peter
Title: Modification and extension of a standard volume-of-fluid solver for simulating boiling heat transfer
Language: German
Abstract:

In the present paper the modifications and extensions of the Volume-of-Fluid solver in the OpenFOAM CFD package for the simulation of boiling flows are presented. The main difficulties in the simulation of boiling flows are high temperature gradients at the liquid-vapor interface and microscopic heat and mass transfer at the 3-phase contact line. As the smeared interface in a pure Volume-of-Fluid method does not allow a precise reconstruction of the interface and thus hinders the accurate determination of the local temperature gradient, the solver is extended by a Level-Set method and a geometric reconstruction method. This facilitates an exact determination of the temperature gradient and of the local evaporation rate. In addition, the solver is extended by a sub-model for the microscale evaporation at the contact line which cannot be resolved on a CFD mesh. The sub-model is coupled to the simulation by adapting the thermal coupling between the solid heating wall and fluid domain. The modifications and the resulting model are validated by simulating phase change in a simple geometry and by simulating the heat and mass transfer during single bubble boiling. Further, the model is applied to perform a 3D simulation with adaptive mesh refinement of a lateral bubble merger. Very good qualitative and quantitative agreement with analytical approaches and experimental observations can be found.

Divisions: 16 Department of Mechanical Engineering > Institute for Technical Thermodynamics (TTD)
Exzellenzinitiative > Clusters of Excellence > Center of Smart Interfaces (CSI)
16 Department of Mechanical Engineering
Zentrale Einrichtungen
Exzellenzinitiative
Exzellenzinitiative > Clusters of Excellence
Event Title: Proceedings ECCOMAS CFD 2010 — Fifth European Conference on Computational Fluid Dynamics
Date Deposited: 17 Mar 2015 15:08
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