Title page for etd-0821112-112938


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URN etd-0821112-112938
Author Ya-ju Yang
Author's Email Address No Public.
Statistics This thesis had been viewed 5247 times. Download 1725 times.
Department Mechanical and Electro-Mechanical Engineering
Year 2011
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title The Design, Fabrication and Performance Analysis of a Flexible Heat Pipe
Date of Defense 2012-07-03
Page Count 120
Keyword
  • flexible heat pipe
  • polymer
  • silicone rubber
  • performance
  • hot embossing
  • Abstract This experiment produces a new flexible heat pipe, and further tests and explores its characteristics and performance. The heat pipe is made of silicone rubber, a kind of polymer material, and was molded by hot embossing. Characteristics of this material include good bending resistance, lightness, and good resistance to high temperature. Furthermore, copper sheets connected with silicone were placed at the evaporator section and condenser section to enhance heat transfer effects. DI water in the pipe was used as the working medium, and two-layer 250 mesh copper nets were used as a wick to strengthen the heat pipe’s capillary effects. The researcher set the vacuum degree at 0.0658 atm to test the pipe’s performances at different powers. Key findings include an optimum filling ratio of 40%, and a largest heat flux of 11.75 W/cm2 during the proficiency test. In addition to the proficiency test . The influence of different angles of bends (0 ~ -90°) on the pipe’s heat transfer performance was also tested and based on heat thermal resistance obtained, found that the best bended angle of the flexible heat pipe was -15°, and thermal resistance will increase with the angle(-30 ~ -90°). The experiment proves a small angle bend that is helpful for the working medium to flow back to the evaporator section, but the heat transfer performance would shrink because the wick could not affix to the inner wall of the pipe if the angle is too large. This work shows the proper combination of pipe parameters will significantly improve heat transfer performance.
    Advisory Committee
  • Chao-kuang Chen - chair
  • Ching-jenq Ho - co-chair
  • Chin-chia Su - co-chair
  • Shou-shing Hsieh - advisor
  • Files
  • etd-0821112-112938.pdf
  • Indicate in-campus at 3 year and off-campus access at 3 year.
    Date of Submission 2012-08-21

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