Flow Field and Temperature Field Analysis in The Rectangular Duct With Baffles

• Main Author: 張耀文
• Other Authors: 莊福盛
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/77518196322763143738

碩士 === 國立臺灣科技大學 === 機械工程系 === 87 === The purpose of this study is to use the numerical method to investigate the developing situation of fluid in a rectangular duct with baffles in the entrance region. The flow is laminar and with isothermal boundary. The influences of various factors, such as the ratio of obstacle’s height and rectangle’s height (F/H), the ratio of periodic length of baffles and rectangle’s height (L/H), and numbers of obstacles in the flow path, on the velocity and temperature distributions are studied. The fluid calculated is focused on Prandtl number being equal to 0.71 and having characteristics of air. The related Reynolds number is 200, 400, 600, the radio of F/H is 0.25, 0.5, 0.75 and the radio of L/H is 0.5, 1, 2, numbers of obstacles are 3, 7. In different geometric shapes, we found that the velocity and temperature distributions in the rectangle flow path are greatly influenced by the height of obstacle in that region.