Chaotic Mixing of Viscous Fluids in Continuous Flows: Basic Issues and Applications

采用实验/数值模拟相结合的方法研究强粘性流动中通常不会出现湍流的混沌混合现象的发生。这种现象被称为混沌平流，已经在二维几何中研究了许多情况，其中流动的强迫是时变的。本研究的目的是在三维几何空间进行实验和数值模拟。要考虑的情况是一种新型的螺旋环状混合器和分隔式管式混合器，在这种混合器中，流体在沿管道流动时周期性地重新定向。

A combined experimental/numerical simulation approach will be applied to study the onset of chaotic mixing phenomena in strongly viscous flows where ordinarily turbulence will not occur. This phenomenon is known as chaotic advection, and a number of cases have been studied in two-dimensional geometries with time-varying forcing of the flow. The present research is to conduct experiments and perform numerical simulations in three-dimensional geometries. The cases to be considered are a novel helical annular mixer and a partitioned pipe mixer in which the fluid is periodically reoriented as it flows down the pipe.