一种利用Taylor-Dean流体的微型混合器:纵横比和流动状态对混合效果的影响

2017/06/23   下载量： 3 次

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利用德国LaVision公司的LIF分析软件平台DaVis对一种利用Taylor-Dean流体的微型混合器进行了纵横比和流动状态对混合效果的影响的研究。

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Chaotic mixing in three different types of curved-rectangular channels flow has been studied experimentally
and numerically. Two walls of the channel (inner and top walls) rotate around the
center of curvature and a pressure gradient are imposed in the direction toward the exit of the
channel. This flow is a kind of Taylor-Dean flow. There are two parameters dominating the flow,
the Dean number De (∝ the pressure gradient or the Reynolds number) and the Taylor number Tr
(∝ the angular velocity of the wall rotation). In this paper, we analyze the physical mechanism of
chaotic mixing in the Taylor-Dean flow by comparing experimental results and numerical ones.
We produced three micromixer models of the curved channel, several centimeters long, with rectangular
cross-section of a few millimeters side. The secondary flow is measured using laser induced
fluorescence (LIF) method to examine secondary flow characteristics. Also we performed
three-dimensional numerical simulations with the open source CFD solver, OpenFOAM, for the
same configuration as the experimental system to study the mechanism of chaotic mixing. It is
found that good mixing performance is obtained in the case of De ≤ 0.1 Tr, and it becomes more
remarkable when the aspect ratio tends to large. And it is found that the mixing efficiency changes
according to the aspect ratio and inflow condition.

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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