A Numerical Study of Three Dimensional Turbulent Flow and Heat Transfer from Confined Five Impinging Slot Jets

• Main Authors: Lee, Geeng -Chang, 李耿昌
• Other Authors: Liu,Min-Shan
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/77827613114118987820

碩士 === 逢甲大學 === 機械工程學系 === 88 === This paper performed a numerical investigation of the turbulent flow and the heat transfer characteristics of confined five impinging jets. Cooling, heating and drying process involving impinging jets in industry have been extensively studied. The well-known technique of impinging jets has a wide variety of engineering applications to improve the local heat transfer at the impingement surface, such as paper and textile drying, metal and glass annealing, electronics and turbine blade cooling, as well as the secondary cooling in continuous coating of steels. The properties such as pressure, velocity, turbulent kinetic energy ,dissipation rate of the turbulent.The k-εtwo equation turbulence model and the control-volume integration formula for finite difference and SIMPLEST algorithm were employed to simulate the three dimensional ,turbulent flow field and heat transfer from confined five impinging slot jets. The results show that the aspect ratio has strong effect on the flow field. For a small aspect ratio the recirculation zones shrunk, and enhances the static pressure and the Nusselt number over the entire impingement surface. The center jet behaves as a single jet and the wall jet decreases the length of the potential core and deflects the other jets. As expected, increase of the jet Renolds number also enhances the Nusselt number, the turbulent kinetic energy and the dissipation rate of the turbulent energy.