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Energy and Environment, 1995

ISBN:
1-56700-052-5 (Print)

EHD ENHANCED HEAT EXCHANGERS: NEW CHALLENGING EQUIPMENT FOR RENEWABLE ENERGY APPLICATIONS

Y. Y. Yan
Thermo-Fluids Engineering Research Centre, Dept. of Mechanical Engineering and Aeronautics, City University, London, EC1V OHB, U.K.

Tassos Karayiannis
Brunel University

Michael W. Collins
Thermo-Fluids Engineering Research Centre, The City University, London EC1V OHB, UK

P. H. G. Allen
School of Engineering Systems and Design, South Bank University, London, SE1 OAA, UK; The City University, London, EC1V OHB, England

R. S. Neve
Thermo-Fluids Engineering Research Centre, Dept. of Mechanical Engineering and Aeronautics, City University, London, EC1V OHB, U.K.

R. K. Al-Dadah
School of Engineering Systems and Design, South Bank University, London, SE1 OAA, UK

Abstract

This paper is concerned with electrohydrodynamic(EHD) enhanced heat transfer and heat exchangers. In the first place, the mechanism of EHD enhancement of two-phase heat transfer is discussed. Then the single tube experimental results of EHD enhancement of boiling heat transfer at different surfaces, such as Hitachi Thermoexcel-C, Thermoexcel-HE and Wieland Gewa-T, are presented and discussed and compared with smooth and low-fin surfaces. Furthermore, two typical EHD enhanced heat exchangers, one 9-tube and another 6-tube, recently developed in the U.K. are described. The investigation has indicated that EHD enhanced heat exchangers are suitable for low superheat conditions which particularly occur in many renewable energy applications.