Firat University, Construction Education Department, Elazig 23119, Turkey.
Environ Technol. 2009 Dec 14;30(14):1539-46. doi: 10.1080/09593330903252232.
Dissolved oxygen is a measure of the quantity of oxygen present in water and is one of the best indicators of the health of a water ecosystem. Dissolved oxygen levels in water can be increased by creating turbulent conditions where fine air bubbles are carried into the bulk of the flow. This is achieved by hydraulic structures. A free-surface conduit is a particular instance of this. In the present work, a series of experiments were conducted to investigate the aeration efficiency of free-surface conduit flow systems. The results indicate that free-surface conduit flow systems are very effective for oxygen transfer. At Froude numbers greater than 15, almost full oxygen transfer up to the saturation value was reached. Moreover, from experimental data, a regression equation was obtained with a very high correlation coefficient, showing the effect of various parameters on the aeration efficiency.
溶解氧是衡量水中氧气含量的一种方法，也是衡量水生态系统健康状况的最佳指标之一。可以通过产生紊流条件，将细小的气泡带入水流主体中来增加水中的溶解氧含量。这可以通过水力结构来实现。自由表面管道就是这种结构的一个特殊实例。在本工作中，进行了一系列实验来研究自由表面管道流系统的曝气效率。结果表明，自由表面管道流系统对于氧气传递非常有效。在弗劳德数大于 15 的情况下，几乎达到了饱和值的完全氧气传递。此外，从实验数据中得出了一个具有非常高相关系数的回归方程，表明了各种参数对曝气效率的影响。
