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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

EXPERIMENTAL STUDY OF THE EFFECT OF NON-UNIFORM ELECTRIC FIELD ON HEAT TRANSFER ENHANCEMENT IN VERTICAL RECTANGULAR MICROGROOVES

Get access (open in a dialog) DOI: 10.1615/IHTC16.hte.022487
pages 5223-5231

Abstract

The objective of this study is to determine the non-uniform electric field for increasing heat transfer in a vertical rectangular microgrooves plate. Needle electrode was selected to produce the non-uniform electric field. Theoretical model is developed to analyze the wetting height under different electric field strength, compared with experimental results, which used infrared imaging technology to measure the capillary wetting height. The average error between the calculated values and the experimental data are, 4.21%, 8.05% and 9.83%, respectively, under the electric field of 0kV, 7kV and 12kV. Different electric field strength and heat flux variations were also applied in the experiments. Results show that the capillary wetting height increases with the increase of electric field strength. The increasing wetting height under the increasing electric field strength help reduce the wall temperature of the microgrooves plate, thus enhancing the heat transfer process of the working fluid in the microgrooves. The heat transfer enhancement factor could reach as high as 1.19 under the applied electric field with the superheat of 14.3°C.