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Heat transfer in shear-driven thin liquid film flows

Marati, J. R. and Budakli, M. and Gambaryan-Roisman, Tatiana and Stephan, Peter (2012):
Heat transfer in shear-driven thin liquid film flows.
In: Proceedings 12th International Symposium on Advances in Computational Heat Transfer CHT-12, [Conference or Workshop Item]

Abstract

The objective of the study is to investigate hydrodynamics and heat transfer in a shear-driven liquid film flow. This process is relevant to fuel flow inside lean pre-mixed pre-vaporization (LPP) chambers. A combined numerical and experimental study has been performed to determine the heat transfer in gas-driven thin liquid films on the outer surface of vertical heated tubes. Numerical simulations have been performed using the volume of fluid (VOF) method implemented in an open source computational fluid dynamics (CFD) code OpenFOAM for turbulent air/water flow conditions. The code has been extended for simulation of two-phase flows with heat transfer. The Reynolds averaged Navier-Stokes equations (RANS) with the k - \textgreeke turbulence model for gas-liquid two-phase flows have been solved using the finite volume method. The results on wall temperature distribution and average film thickness have been compared with experimental data. A reasonable agreement between the simulations and experiment has been found. The results indicate that the heat transfer is enhanced with increasing gas Reynolds number due to the film thinning and intensification of convection.

Item Type: Conference or Workshop Item
Erschienen: 2012
Creators: Marati, J. R. and Budakli, M. and Gambaryan-Roisman, Tatiana and Stephan, Peter
Title: Heat transfer in shear-driven thin liquid film flows
Language: English
Abstract:

The objective of the study is to investigate hydrodynamics and heat transfer in a shear-driven liquid film flow. This process is relevant to fuel flow inside lean pre-mixed pre-vaporization (LPP) chambers. A combined numerical and experimental study has been performed to determine the heat transfer in gas-driven thin liquid films on the outer surface of vertical heated tubes. Numerical simulations have been performed using the volume of fluid (VOF) method implemented in an open source computational fluid dynamics (CFD) code OpenFOAM for turbulent air/water flow conditions. The code has been extended for simulation of two-phase flows with heat transfer. The Reynolds averaged Navier-Stokes equations (RANS) with the k - \textgreeke turbulence model for gas-liquid two-phase flows have been solved using the finite volume method. The results on wall temperature distribution and average film thickness have been compared with experimental data. A reasonable agreement between the simulations and experiment has been found. The results indicate that the heat transfer is enhanced with increasing gas Reynolds number due to the film thinning and intensification of convection.

Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute for Technical Thermodynamics (TTD)
Exzellenzinitiative
Exzellenzinitiative > Clusters of Excellence
Zentrale Einrichtungen
Exzellenzinitiative > Clusters of Excellence > Center of Smart Interfaces (CSI)
Event Title: Proceedings 12th International Symposium on Advances in Computational Heat Transfer CHT-12
Date Deposited: 17 Mar 2015 15:07
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