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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

SPATIOTEMPORALLY RESOLVED HEAT TRANSFER IN FALLING-FILM FLOWS BY LASER-INDUCED FLUORESCENCE, PARTICLE TRACKING VELOCIMETRY AND INFRARED THERMOGRAPHY

Alexandros Charogiannis
Clean Energy Processes (CEP) Laboratory, Department of Chemical Engineering, Imperial College London, London SW7 2AZ, United Kingdom

Fabian Denner
Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, U. K.

Berend G. M. van Wachem
Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, U. K.

Serafim Kalliadasis
Department of Chemical Engineering, Imperial College London, London SW7 2AZ, U. K.

Christos N. Markides
Clean Energy Processes (CEP) Laboratory, Department of Chemical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom

Abstract

We present an experimental technique, based on the simultaneous application of planar laser-induced fluorescence (PLIF), particle tracking velocimetry (PTV) and infrared thermography (IRT), aimed at the detailed measurement of unsteady heat-transfer in harmonically-excited film flows falling under the action of gravity over an inclined, electrically-heated substrate. PLIF is employed in order to recover space- and time-resolved film-height information, PTV to obtain two-dimensional (2-D) velocity, and IRT to measure the free-surface (gas-liquid interface) temperature over a 2-D domain. Phase-lock averaged film-height, flow-field and freesurface data, we demonstrate the generation of highly localized film-height, velocity and heat-transfer along the wave topology over a range of applied heat fluxes.

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