Layout of Obstacles that Optimizes Mixing Effect in Y-type Microchannel
Obstacles were placed in a microchannel to try disrupting flows; reduce the diffusion path of two fluids, and thereby improve mixing. The optimal layout of such obstacles is important but has rarely been addressed, and parameters of the optimal layout, such as number, distance and arrangement of cylinders embedded in the channel as well as inlet Reynolds number ratio, are worthy of study because they directly influence mixing. In this work, a shear stress flow produced using cylinders in a Y-type microchannel is applied to execute the flow mixing at Reynolds numbers from 0.5 to 60. The disruption of flow velocity field alters the flow direction from one fluid to another. Accordingly, convection may occur and refer to enhance mixing. A series of numerical simulations are performed and yield some useful results. General speaking, a larger number of cylinders and a smaller distance between them normally correspond to a stronger mixing effect. In the case studied herein, five cylinders, arranged in a V with an angle of 90° at the base of the V, and a distance between pairs of cylinders of 100 μm, is preferred choice because of it causes excellent mixing. Besides, the effect of Reynolds number ratio concerned at the basis of Re=0.5 for one of inlet will be investigated. The Reynolds number ratio of ten is suggested for inlet flows. These findings will be useful in the design of passive mixing devices.
Optimal layout Obstacle Passive mixer
C. T. Wang C. C. Huang
Department of Mechanical and Electro-Mechanical Engineering, National I-Lan University
国际会议
首届亚洲计算传热与计算流体国际会议(2007 Asian Symposium on Computational Heat Transfer and Fluid Flow)
西安
英文
2007-10-08（万方平台首次上网日期，不代表论文的发表时间）