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Journal of Enhanced Heat Transfer
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ISSN Druckformat: 1065-5131
ISSN Online: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v14.i1.30
pages 53-64

Study on the Heat Transfer Enhancement of Oscillating-Flow Heat Pipe by Pulse Heating

Haizhen Xian
Beijing Key Laboratory of Energy Safety and Clean Utilization, North China Electric Power University, Beijing 102206, China
Deng-Ying Liu
Beijing Key Laboratory of Energy Safety and Clean Utilization, North China Electric Power University, Beijing 102206; and Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100080, China
Yongping Yang
MOE Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, North China Electric Power University, Beijing 102206, China
Fumin Shang
Beijing Key Laboratory of Energy Safety and Clean Utilization, North China Electric Power University, Beijing 102206, China
Xiaoze Du
Key Laboratory of Condition Monitoring and Control for Power Plant Equipment (North China Electric Power University), Ministry of Education, Beijing 102206, China; School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China

ABSTRAKT

Oscillating-Flow Heat Pipe (OFHP) is a new type of heat transfer devices, which has an excellent heat transfer performance. In this paper, pulse heating is adopted instead of conventional continuous heating to enhance the heat transfer of this device. Experimental results indicate that the heat transfer rate of pulse heating of OFHP is higher than that of the continuous by 15−38%, and the effective thermal conductivity is higher by 12−63% at the same heating power. There exists an optimal region of heating power for OFHP. To a certain extent, the heat transfer performance of OFHP is reflected by the value of frequency and amplitude of temperature oscillation. In addition, when the heating power was maintained at a constant value, the heat transfer characteristics of OFHP are variable with change of pulse duration and time interval, and both heat transfer rate and effective conductivity have a maximum value. Due to the combined action of internal and external thermal fields, an optimal operating range of pulse duration and time interval may exist.


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