Effect of Jet-Jet Spacing on Heat Transfer for Confined

• Main Authors: Chen, Wen-i, 陳文義
• Other Authors: San
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/46882649858890041413

碩士 === 國立中興大學 === 機械工程學系 === 86 === The heat transfer of five confined staggered array circular air jets impinging on a flat plat with a constant surface heat flux is investigated. The work mainly deals with the effect of jet- jetspacing on the local Nusselt number. The considered spacing- to-diameter ratio individually is 4, 6, 8, 12, 16 and 24. The jet total temperature is controlled at 27℃. The plate spacing- to-diameter ratio is selected to be 2.0 and 4.0 respectively. The jet diameter is 3 mm. The surface heat flux is 1,000 . The consideredReynolds number of center jet is 30,000. The Reynolds number of adjacent jets individually is 30,000, 20,000 and 0. Three heating foil widths are arranged in experiment, namely, 37.5, 87.5 and 112.5 mm (w/d=12.50, 29.17, 37.50 respectively).