Title page for etd-0821112-160000


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URN etd-0821112-160000
Author Meng-Lin Wang
Author's Email Address No Public.
Statistics This thesis had been viewed 5360 times. Download 1203 times.
Department Mechanical and Electro-Mechanical Engineering
Year 2011
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Thermal Characteristics of High Power LED Cooling by Ultrasonic Micro-nozzle Plate Arrays
Date of Defense 2012-07-03
Page Count 117
Keyword
  • Ultrasonic micro-nozzle plate
  • High power LED
  • Spray cooling
  • μPIV
  • Piezoelectric ceramic material
  • Abstract By focusing on the cooling requirement of high power LED, the study aims to explore the spray cooling method and analyze its cooling performance. The ultrasonic micro-nozzle plate made of piezoelectric ceramic material was used in this experiment in order to establish a spray cooling system. The nozzle plate array (3 × 2) was used to carry out a cooling test for 24 LEDs with high power (6 × 4). Three different watts (1 W, 3 W, 5 W) of LED were tested, the total input power was 24W, 72W and 120 W, respectively, and the working medium was DI water. The goal is to understand the variance in performance caused by nozzle plates of different nozzle diameters (dj = 7, 35 μm) in varied nozzle distances (z = 10, 20, 30, 40, 50 mm). The experiment used thermocouples to measure the slug temperature of LED. By applying thermal resistnace to the LED to calculate its chip temperature, and using micrometer resolution particle image velocimetry (μPIV) to observe the spray flowfield inside the LED chamber, this study analyzes the influence of flowfield change on cooling performance.
    Advisory Committee
  • Chao-Kuang Chen - chair
  • Ching-Jenq Ho - co-chair
  • Chin-Chia Su - co-chair
  • Shou-Shing Hsieh - advisor
  • Files
  • etd-0821112-160000.pdf
  • Indicate in-campus at 0 year and off-campus access at 1 year.
    Date of Submission 2012-08-21

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