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EXPERIMENTAL INVESTIGATION ON CONVECTIVE HEAT TRANSFER ENHANCEMENT BY EHD

DOI: 10.1615/ICHMT.2014.IntSympConvHeatMassTransf.640
pages 845-860

Merouane Hamdi
GEPEA (CNRS UMR 6144), ONIRIS, rue de la Geraudière, BP 82225, 44322 Nantes, France

Michel Havet
GEPEA, ONIRIS – Site de la Geraudiere, Nantes, France

Olivier Rouaud
GEPEA, ONIRIS – Site de la Geraudiere, Nantes, France

Dominique Tarlet
Laboratoire de Thermocinétique de Nantes (CNRS UMR 6607), Polytech Nantes, rue C. Pauc, BP 50609, 44306 Nantes, France

Abstract

The purpose of this study was to investigate the enhancement of forced convection heat transfer by the application of an electric field. The electric field creates an electro-hydrodynamic (EHD) induced air flow produced by columbic forces. A series of experiments were performed in a horizontal air flow channel equipped with different arrangements of wire-electrodes suspended above a conductive plate. These electrodes were arranged either parallel or perpendicular to the direction of primary air flow. Measurements were made on the system in order to determine the heat transfer coefficient and energy consumption. These results were used to determine an optimal configuration of electrode placement and system operating parameters (i.e. applied voltage, primary air flow velocity, wire-electrode to plate distance). In most cases the results show that heat transfer enhancement due to EHD is significant only at low Reynolds numbers. The most significant increase in heat transfer resulted in a single wire-electrode arranged perpendicular to the air flow direction (8x as compared to forced convection without EHD). However, the heat transfer enhancement was limited to a small area just below the electrode. In addition it hindered the primary air flow due to a localized increase in pressure drop. For cases of more than one parallel arranged wire-electrode the heat transfer enhancement was slightly less (6x) but more wide-spread over the conductive plate. Furthermore, the effect on the pressure drop was minimal.

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