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Flow Characteristics Related to Liquid/liquid Mixing Pattern in an Impeller-stirred Vessel

机译：叶轮搅拌容器中液/液混合方式的流动特性

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Impeller stirring is an important industrial technique which is used in hot metal pretreatment processes in steelmaking. The liquid/liquid flow characteristics of impeller stirring were clarified by a two-dimensional PIV experiment and CFD analysis and a liquid/liquid system consisting of liquid paraffin (oil) and ion-exchanged water (water). The target mixing patterns were Types I, II and III. Here, Type I is defined as the region where the two liquid phases exist separately, Type II is the region where dispersed oil exists in a scattered form in a continuous water phase, and Type III is the region where dispersed air and oil existed in the continuous liquid phase of water. The calculated oil/water and air/water interfaces were in good agreement with the experimental results. The vertical upward flow near the wall resulted in one or two circulation flows, one near the oil/water interface and the other below it, whereas the downward flow formed a single circulation flow near the bottom. The cross-sectional mean water velocity and turbulence energy displayed their peak values at the blade side regardless of the mixing patterns. In addition to the large value at the blade side, turbulence energy displayed a large value near the air/water interface in the type III mixing pattern. In Types I and II, the cross-sectional mean water velocity and turbulence energy near the oil/water interface increased at higher rotation speeds. The turbulence energy at the gap between the water and the side of the paddle blade proceeded toward the vessel wall.
机译：叶轮搅拌是一项重要的工业技术，用于炼钢中的铁水预处理过程。通过二维PIV实验和CFD分析以及由液体石蜡（油）和离子交换水（水）组成的液/液体系，阐明了叶轮搅拌的液/液流动特性。目标混合模式为I，II和III型。在此，类型I被定义为两种液相分开存在的区域，类型II是在连续的水相中分散的油以分散形式存在的区域，类型III是在其中的空气和油存在分散的区域。连续液相的水。计算出的油/水和空气/水界面与实验结果非常吻合。靠近壁的垂直向上流动导致一个或两个循环流，一个靠近油/水界面，另一个在其下方，而向下流动在底部附近形成一个循环流。无论混合方式如何，横截面平均水速和湍流能量在叶片侧均显示其峰值。除了叶片侧的较大值外，湍流能量在III型混合模式的空气/水界面附近也显示较大的值。在类型I和类型II中，油/水界面附近的横截面平均水速和湍流能在较高的转速下会增加。在水和桨叶侧面之间的间隙处的湍流能量向着容器壁前进。

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