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標題: 具連續移動平板之三維紊流噴射撞擊流場之熱傳數值分析
Numerical Analysis of Convective Heat Transfer of 3-D Turbulent Impinging Jets with a Continuous Moving Plate
作者: 鍾毓煒
Chung, Yu-Wei
關鍵字: three-dimensional turbulent;三維紊流;moving impinging surface;crossflow;upwash fountain;recirculation region;移動衝擊面;橫向流;上沖噴泉流;迴流區
出版社: 機械工程學系

This study presents the numerical simulation and analysis on the fluid flow and heat transfer characteristics of three-dimensional turbulent impinging jets with a continuous moving plate. The computational fluid code, PHOENICS, is used to simulate the distribution of heat transfer on the impinging surface. The effect of the jet Reynolds number Re, nozzle-to-nozzle distance (L), two plates distance (H), the ratio of impinging surface velocity (Vp), the ratio of crossflow velocity (M), and nozzle arrangements (in-line and triangular array) on plate heat transfer and friction coefficient will be studied one by one.
It is found that upwash fountain flow between the two nozzles is generated when impinging jets directed outward or normal to the plate. Two lower pressure recirculation regions are induced due to the interaction between impinging jets and fluid surroundings. The flow structure and the rate of heat transfer on impinging surface are significantly affected by relevant parameters.
Maximum value of local Nusselt number and shear stress on impinging surface is decreased and shifted the direction of plate moving a little while the plate motion is increased. Specially, combined wall jet and stagnation line region on impinging surface is curved, and the upwash fountain will produce deflection. In the case with crossflow, heat transfer rate on the impinging surface is decreased while the ratio of crossflow velocity to mean jet velocity (M) is increased. In summary, the results show that neglecting impinging surface motion effects can lead to the heat transfer is overestimated. It is very important to understand the heat transfer rate from relevant factors for designing a cooling or heating system with better performance.
Appears in Collections:機械工程學系所

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