Influence of axial vibration and condensation temperatures on the heat transfer performance of horizontal heat pipes

• Main Authors: Lin, Yung-Jen, 林雍荏
• Other Authors: Chen, Rong-Horng
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/82923997115169105858

碩士 === 南台科技大學 === 能源工程研究所 === 98 === This research mainly discusses the effect on the heat transfer phenomenon of heat pipe in regard to axial vibration and different condensing section temperature. In the experiment, 600mm in length and 8mm in diameter of grooved heat pipe copper round is used, and pure water is the working fluid in the pipe. Regarding the experimental parameter, frequency of the axial vibration is 3Hz, 4Hz, 5Hz, 6Hz and 9Hz, and the amplitude of vibration is 2.8mm, 5mm, 10mm, 15mm, 20mm and 25mm. Conversion from above, acceleration is approximately 0.1g ~1.01g. Otherwise, the condensing section temperature is separately set for 20℃, 30℃ and 40℃. The heating piece is set up in the evaporating section to simulate the heating circumstance of heat flux boundary. The experimental result shows that the influence on the heat pipe in axial vibration environment is not directly related to the acceleration, but it is related to the vibration frequency and the amplitude of vibration. Changing condensing section temperature would affect the heat transfer phenomena of the heat pipe. When the condensing section temperature drops, the evaporating section’s average temperature would drop. However, when the condensing section temperature drops, the maximum rate of heat transfer in the heat pipe also drops. It causes dry-out phenomenon of heat transfer limit early happened and seriously affect the property of cooling channel in heating pipe. The result of this research could become the reference of heating system design.