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HEAT TRANSFER IN SHEAR-DRIVEN THIN LIQUID FILM FLOWS

Jagannath Rao Marati
Technische Thermodynamik, Technische Universitat Darmstadt, Petersenstrasse 17, D-64287 Darmstadt, Germany

M. Budakli
Technische Thermodynamik, Technische Universitat Darmstadt, Petersenstrasse 32, D-64287 Darmstadt, Germany

Tatiana Gambaryan-Roisman
Institute of Technical Thermodynamics and Center of Smart Interfaces, Technische Universitat Darmstadt, Alarich-Weiss-Str. 10, 64287, Darmstadt, Germany

Peter Stephan
Institute for Technical Thermodynamics, Technische Universität Darmstadt, 64287 Darmstadt, Germany

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 − ε 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.

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