Number：

04100009

Download

PDF

Name：

Tzer-Ming Jeng

Titles：

教授

Author：

Tzer-Ming Jeng, Sheng-Chung, Yi-Chang Yang, Chih-Ting Yeh

Paper name：

2011中華民國航太學會學術研討會

Name of activity：

Detailed Measurements of Heat Transfer Coefficients in a 180-deg Rectangular Turned Channel with the Perforation Divider

Keywords： 180--deg rectangular turned channel, transient liquid crystal method, perforation, heat transfer.

Abstract：This work measured the heat transfer coefficients of air flow through the 180-deg rectangular turned channel by using the transient liquid crystal method. The cross of channel was square. The divider of the 180-deg retangular turned channel had several perforations with equal interval then the fkuid in the first fuct can early flow into the second duct through the perforations to adjust the local heat reansfer. Variable parameters were the Reynolds number (Re=2468-12340) ，the ratio of the perforations diameter to the channel hydraulic diameter (d/D)=1/4 and 2/4) ，the angel of perforations and the number of perforations (n=1，2 and 3 . The results indicated that at the tun and the neighborhood，the effects of the flow inertia and impingement induced the peak values of heat transfer on the bottom and outer side surfaces Excluding the heat transfer amount at the inner side surface and the perforations of the divider the non-preforation configuration had the best tital heat reanfer performance among all the test configurations The Nudeclined when the number or size of perforations increased while the angle of perforations was insensitive to Nu Besides the distribution of the Nusselt number (Nu) was strongly influenced by the angle of perforations as d/D=2/4

Back