| RE-AERATION LAW OF WATER FLOW OVER SPILLWAYS |
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| 作者姓名： | CHENG Xiang-ju LUO Lin CHEN Yong-can ZHAO Wen-qian |
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| 作者单位： | CHENG Xiang-ju Department of Hydraulic Engineering，Tsinghua University，Beijing 100084，ChinaLUO Lin State Key Laboratory of Hydraulics and Mountain River Engineering，Sichuan University，Chengdu 610065，China CHEN Yong-can Department of Hydraulic Engineering，Tsinghua University，Beijing 100084，China ZHAO Wen-qian State Key Laboratory of Hydraulics and Mountain River Engineering，Sichuan University，Chengdu 610065，China |
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| 摘 要： | 1. INTUODUCTION Due to the strong turbulence of the flow over the spillway, air is entrained into water body making the oxygen content increased. It is important for river, especially for city-river to maintain favorable water quality and ecological envir…
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| 关 键 词： | 再充气 质量转移系数 溢洪道 传递过程 流体力学 |
| 收稿时间： | 2005-05-16 |
RE-AERATION LAW OF WATER FLOW OVER SPILLWAYS |
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| CHENG Xiang-ju LUO Lin CHEN Yong-can ZHAO Wen-qian.RE-AERATION LAW OF WATER FLOW OVER SPILLWAYS[J].Journal of Hydrodynamics,2006,18(2):231-236. |
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| Authors: | CHENG Xiang-ju LUO Lin CHEN Yong-can ZHAO Wen-qian |
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| Abstract: | In order to explore the re-aeration law of water flow over spillway, the transfer process of oxygen in water flow over spillway was studied. The interfacial mass transfer coefficients were obtained by experiments. The flow fields and the turbulence characteristics are simulated by numerical methods. The fractional Volume Of Fluid (VOF) model of the air-water two phase flows was introduced to track the interface. Consequently, the quantitative expression of the interfacial mass transfer coefficients related with velocity and kinetic energy at the free surface was derived and the re-aeration model for the water flow over spillway was established. The examination with the experimental data of different conditions shows the validity of the re-aeration model for the water flow over spillways. This study will be important to evaluate the dissolved oxygen concentration and self-purification ability of rivers. |
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| Keywords: | re-aeration mass transfer coefficient spillway |
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