Transient Flow and Heat Transfer Leading to Periodic State in a Cavity with a Baffle Due to an Oscillating Air-Supply Guide Vane

• Main Authors: Kun Chun Chiang, 江坤駿
• Other Authors: 施陽正
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/q33f3f

碩士 === 國立臺北科技大學 === 能源與冷凍空調工程系碩士班 === 105 === Due to the higher demand of life quality that people concern, considering both human comfort and air mobility in the room is more important. A specific air-conditioning of the ventilating room study can present the characteristic of in-door air. Recent study has shown the finite-volume-based computational study can be used on a jet inducing into a cavity. This method can also analyze the air distribution of a space that a jet induce air into by periodically-swinging fin. In order to achieve the actual circumstance, a baffle is placed at the middle of the bottom wall. However the baffle may block the way of jet flow then change its behavior to vary the heat performance. This study employ ANSYS FLUENT, which is commercial flow analysis software, to analyze periodically air distribution and heat performance. According to the result, the jet flow change its track after collide with the middle baffle, causing non-uniform temperature distribution in the room. The jet flow is well mixed with the air between inlet port and middle baffle, hence the temperature gradient is great and the heat transfer is active as well. The pile of heat behind the baffle, for the most part, is removed by the clockwise eddy. The result also has shown that changing the height of middle baffle does not cause obviously affect heat performance. In contrast, the main factor affecting the air flow distribution under this case is the amplitude of swinging fin.