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Proceedings of Symposium on Energy Engineering in the 21<sup>st</sup> Century (SEE2000) Volume I-IV

ISSN:
1-56700-132-7 (Print)

EHD ENHANCEMENT OF BOILING HEAT TRANSFER IN VERTICAL TUBE

Enke An
College of Power Engineering University of Shanghai for Science and Technology

Rui-Yang Li
University of Shanghai for Science and Technology, 200093, Shanghai, China

Hong-Ling Yu
University of Shanghai for Science and Technology, 200093, Shanghai, China

ZhiHang Chen
East China University of Technology; College of Power Engineering University of Shanghai for Science and Technology

Xuan Huang
College of Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

Xuelai Zhang
College of Power Engineering University of Shanghai for Science and Technology

Abstract

The applicability of electrohydrodynamics (EHD) technique for in-tube boiling heat transfer enhancement of Rll in vertical tube was investigated experimentally. The test rig was similar to a separated heat pipe which consisted of a tube-in-tube heat exchanger with hot water or cold water flowing in the outer tube and refrigerant flowing through the inner tube. A coaxial stainless steel cylindrical electrode with an outer diameter (OD) of 2.5mm and a length of 800mm was inserted through the test section, which was a smooth stainless steel pipe with an inner diameter of 25mm. The experiments was conducted under different values of heat flux, electric high voltage, and superheat. It was found that Rl 1 exhibits an evident response to the EHD effect. An increase in the heat transfer coefficient of as high as 300% was obtained compared to the base case (absence of EHD effect). The electrical power consumption was found to be less than 0.3% of the corresponding heat transfer rate.