Title page for etd-0821112-165900


[Back to Results | New Search]

URN etd-0821112-165900
Author Yu-Fang Hsu
Author's Email Address No Public.
Statistics This thesis had been viewed 5357 times. Download 2620 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 an Ultrasonic Micro-nozzle Plate
Date of Defense 2012-07-03
Page Count 120
Keyword
  • Ultrasonic micro-nozzle plate
  • Spray cooling
  • High power LED
  • μPIV
  • Piezoelectric ceramic material
  • Abstract This study aims to explore the use of an ultrasonic micro-nozzle plate, made of piezoelectric ceramic material, as a core material to establish a set of spray cooling system for high power LED. The system uses a single nozzle plate to implement a cooling test for 4 high power LEDs (2 × 2). The total input power was 4 W, 12 W and 20 W, and working medium was DI water. In order to understand the performance variance introduced by utilizing nozzle plates with differing nozzle diameters (dj = 7, 35 μm) across various nozzle exit to test distance (z = 10, 20, 30, 40, 50 mm). By using micrometer resolution particle image velocimetry (μPIV) to observe the spray flowfield inside the chamber, and using thermocouples to measure the temperature of LED slug and thermal resistance was used to calculate the LED junction temperature , Tj, for analyzing the influence of flowfield change spread in chamber on its cooling performance. The possibility of an LED spray cooling system is also explored.
    Advisory Committee
  • Chao-Kuang Chen - chair
  • Ching-Jenq Ho - co-chair
  • Chin-Chia Su - co-chair
  • Shou-Shing Hsieh - advisor
  • Files
  • etd-0821112-165900.pdf
  • Indicate in-campus at 0 year and off-campus access at 1 year.
    Date of Submission 2012-08-21

    [Back to Results | New Search]


    Browse | Search All Available ETDs

    If you have more questions or technical problems, please contact eThesys