Title page for etd-0714118-142732


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URN etd-0714118-142732
Author Ya-Chiao Hsu
Author's Email Address No Public.
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Department Mechanical and Electro-Mechanical Engineering
Year 2017
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Convective Heat Transfer Analysis of Smooth/Roughened Microchannels with Axial Heat Conduction Effect
Date of Defense 2018-07-10
Page Count 69
Keyword
  • Heat transfer enhancement
  • Microchannels
  • Microstructure
  • Micro-pin fins
  • Dimensional analysis
  • Buckingham pi theorem
  • Abstract This study aims to derive experimental formula in advantage of dimensional analysis and explore the related parameter influence on microchannel thermal field to analyze and calculate. Nevertheless, the heat transfer effect of the previous experiment is not obvious. Axial heat conduction had been found in the experiment. By further realizing and studying axial heat conduction influence on microchannel, we calculated the data of the heat transfer enhancement in axial heat conduction. Under the condition of the thermal insulation environment, if there is no axial heat conduction occurring, and the heat which generate by axial heat conduction in the experiment was absorbed by water, the hypothesis of heat transfer enhancement can be increased. In the microchannel of the smooth microchannel and the five different shape pin fins, the axial heat conduction of the square pin fin is larger, and the heat transfer enhancement benefit is also optimized by the correction. In the experiment, axial heat conduction resulted to the decline of the experimental heat transfer enhancement had been noted. Axial heat conduction is not only controlled by axial conduction number, but also by another important cause, temperature gradient ratio. The bigger the temperature gradient ratio is, the bigger the axial heat conduction will be. When calculating experimental temperature gradient ratio, we found that the smaller the Reynolds number is, the bigger the temperature gradient ratio will be. When calculating experimental temperature gradient ratio, we found that the smaller the Reynolds number is, the bigger the temperature gradient ratio will be. To sum up the research result of the axial conduction number and temperature gradient ratio, under the condition of the smaller Reynolds number, the impact of the axial heat conduction will be obvious, which also happen in the microchannel with micro pin fins.
    Advisory Committee
  • C.J. Ho - chair
  • Chao-Kuang Chen - co-chair
  • Ru Yang - advisor
  • Shou-Shing Hsieh - advisor
  • Files
  • etd-0714118-142732.pdf
  • Indicate in-campus at 3 year and off-campus access at 4 year.
    Date of Submission 2018-08-14

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