Numerical simulation of natural convection in an enclosure with three heat sources

• Main Authors: Feng-Ping Liu, 劉鋒斌
• Other Authors: Chen-Yuan Wang
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/40741181794949496682

碩士 === 國立成功大學 === 航空太空工程學系碩博士班 === 95 === A transient numerical method is developed to solve the coupled natural convection and heat conduction problem for three heat sources mounted on a conductive substrate in a three-dimensional enclosure filled with air. Three heat sources, are arranged in four different positions with iosthermal andinsulated walls. When Ra=1.7E+5 and Pr=0.7,the calculating results, show that different positioned arrangements strongly influence the temperature and velocity. The maximum relative temperature difference in the second stagger arrangement without heat sink is 15.48%. Four arrangements with three fins heat sink the temperature drop is 12%~20%, and the temperature difference is 1%~4%. With five fins heat sink the temperature drop is 15%~22%, and the temperature difference is 1%~4%. In the in line arrangement with three fins heat sink, fins height add to 19mm, the temperature drop is 34.79% and temperature difference is 3.44%. The results indicates that even though fins and height increase the total fluid flow region reduce, but the total contact area between fluid and solid increases, the surface heat appears to exchange for increase and decrease of temperatures.