High heat flux thermal solution of laser system

• Main Author: Lee, Sheng Tat.
• Other Authors: Wong Teck Neng
• Format: Final Year Project
• Language: English
• Published: 2009
• Subjects: DRNTU::Engineering::Mechanical engineering
• Online Access: http://hdl.handle.net/10356/16838
• Institution: Nanyang Technological University

Current technologies to handle high heat fluxes include spray cooling and impingement cooling. Much investigation has been devoted by researchers in these areas in order to better understand the mechanisms behind them as well as to formulate useful correlations that may help predict their performance. The author has performed computer simulation studies on various parameters such as mass flow rate, intermediate pressure and chamber pressure that affect the performance of spray cooling and impingement cooling as a whole. The author has also compared the simulation results of both methods. The studies show that spray cooling on the whole is superior to impingement cooling in terms of coping with a higher heat flux as it can remove over 400 W/cm2 as compared to the best impingement cooling results which cope with about 20 W/cm2. The author has continued work on the previously designed closed loop spray cooling system by performing experiments to verify the simulation results, and adding several components such as a manual valve, thermocouples and pressure transducers to the system which will enable control over the system as well as detailed measurement of critical thermo physical properties of the refrigerant, R134-a at various points around the cycle. The author has also acquired a new set of nozzles for use with the current system. The author recommends that further experiments be carried out with the new nozzles in order to verify the simulation results.