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Research Papers: Evaporation, Boiling, and Condensation

Heat Transfer Characteristics of Oscillating Heat Pipe With Water and Ethanol as Working Fluids

[+] Author and Article Information
Haizhen Xian, Xiaoze Du

School of Energy and Power Engineering, Beijing Key Laboratory of Energy Safety and Clean Utilization, North China Electric Power University, Beijing 102206, China

Yongping Yang

School of Energy and Power Engineering, Beijing Key Laboratory of Energy Safety and Clean Utilization, North China Electric Power University, Beijing 102206, Chinayyp@ncepu.edu.cn

Dengying Liu

Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China

J. Heat Transfer 132(12), 121501 (Sep 21, 2010) (6 pages) doi:10.1115/1.4002366 History: Received April 06, 2010; Revised July 27, 2010; Published September 21, 2010; Online September 21, 2010

In this paper, experiments were conducted to achieve a better understanding of the oscillating heat pipe (OHP) operating behavior with water and ethanol as working fluid. The experimental results showed that there existed a necessary temperature difference between the evaporator and the condenser section to keep the heat pipe working. The maximum effective conductivity of the water OHP reached up to 259kW/mK, while that of the ethanol OHP is of 111kW/mK. Not all the OHPs are operated in the horizontal operation mode. The heat transfer performance of the ethanol OHP was obviously affected by the filling ratio and the inclination angle but the influence law is irregular. The effect of the filling ratio and the inclination angle of the water OHP were smaller than that of the ethanol one. The heat transfer performance of the OHP was improved with increase of operating temperature. The startup characteristics of the OHP depended on the establishment of the integral oscillating process, which was determined by the operating factors. The startup temperature of the ethanol OHP varied from 40°C to 50°C and that of the water, OHP varied from 40°C to 60°C without considering the horizontal operating mode. The water OHP showed a better performance and more stable heat transfer characteristics than the ethanol OHP, which had no obvious advantages of the startup capability as well.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 2

The minimum temperature difference between the evaporator and the condenser section: (a) ethanol and (b) water

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Figure 3

The thermal performance of the ethanol OHP

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Figure 4

The thermal performance of the water OHP

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Figure 5

The wall temperature oscillations at the condenser section

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Figure 1

Schematic experiment system

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