Title page for etd-0715117-093212


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URN etd-0715117-093212
Author Wei-Che Chang
Author's Email Address No Public.
Statistics This thesis had been viewed 5354 times. Download 17 times.
Department Mechanical and Electro-Mechanical Engineering
Year 2016
Semester 2
Degree Master
Type of Document
Language English
Title Thin Film Roughened Surface Effect On Spray Cooling Heat Transfer
Date of Defense 2017-07-26
Page Count 110
Keyword
  • Thin film surface
  • roughness
  • piezoelectric plate
  • spray cooling
  • boiling curves
  • Abstract The objective of this study was to investigate the effect of coated thin films (several nanometers thick) made from different materials on enhancing the cooling performance of a spray cooling system that contained a spray nozzle with a mini piezoelectric piece. The roughness of the thin film surfaces increased the reaction areas as well as the number of nucleation sites (which formed bubbles during nucleate boiling), improving the boiling heat transfer performance of the spray cooling system. For the study experiment, copper was used as the base of the test surfaces, which were coated with thin films made from different materials (i.e., graphene, multiwall carbon nanotubes (MCNT), and diamond-like carbon (DLC). Next, a porous piezoelectric spray nozzle with an atomization piece, an aperture of 35µm, a mass flow rate of 5.33×10^(-4)kg/s, and a spray height of 50 mm was used to spray DI water as a working fluid on heated test surfaces, initiating the spray cooling experiment. A T-type thermocouple was used to measure the resulting temperatures, after which related parameters such as test surface temperatures and heat transfer amounts were calculated. The related parameters were used to generate boiling and quench curves to analyze the effect of thin film surface roughness on the ability of spray cooling to improve heat transfer properties.
    Advisory Committee
  • Ching-Jenq Ho - chair
  • Chao-Kuang Chen - co-chair
  • Shou-Shing Hsieh - advisor
  • Chi-Hui Chien - advisor
  • Files
  • etd-0715117-093212.pdf
  • Indicate in-campus at 2 year and off-campus access at 2 year.
    Date of Submission 2017-08-15

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