微混合器研究进展

1、.,微混合器研究进展,Seminar ,学生： 赵玉潮 导师： 袁 权 院 士 陈光文 研究员,微化工技术组 2006/5,.,主要内容,材质与加工方法 流动特性分析 微混合器分类 混合效果评价方法,.,（一）材质与加工方法,不锈钢 铝片 硅 石英和玻璃 硬质高分子聚合物 弹性聚合物 光敏聚合物,机械微加工 湿法刻蚀 干法刻蚀 高分辨刻蚀(LIGA) 注塑 原位聚合 热压 气相沉积 软刻蚀,.,（二）微混合器内流体流动特点,.,微尺度下混合原则,.,（三）微混合器分类,.,从动式微混合器的特点,优点 结构简单 操作稳定 容易集成 成本较低 易自动化,缺点 混合时间长 混合效果差,.,平行迭片,

2、从动式,.,平行迭片,从动式,.,平行迭片,从动式,.,平行迭片,IMM公司的Ehrfeld小组设计了一种交趾式微混和器,从动式,.,串联迭片,从动式,.,串联迭片,从动式,通过优化微通道结构，使流体层层叠加，He等设计了一种小体积、小流速的微混合器,.,注射式微混合器,从动式,.,混沌对流,从动式,中等雷诺数区域（10Re100）：,.,混沌对流,从动式,.,混沌对流,从动式,.,混沌对流,从动式,.,主动式微混合器的特点,优点 混合时间短 混合距离短 可选择性大 适于极低Re数,缺点 不易集成 成本较高 制作困难 材质要求高,.,脉冲扰动,主动式,压力扰动,速度脉冲侧线进料,微搅拌（外加电

3、磁场）,.,电场扰动,主动式,Moctar等把电极置于微通道内，改变电极两端电压和频率，使两种不同性质的流体按不同轨迹运动，在微通道内产生混沌对流，结果发现在Re=0.02时就能达到较好混合效果,.,其它能量形式,磁动力：在外加磁场作用下，电极上产生直流电，使电解质溶液中带电粒子受到罗仑兹力，并带动流体翻转、折叠，增加接触面积； 超声波：用声波来搅拌微混合器内的流体； 电动力：通过外加电流，改变电渗流速度大小和方向，产生混沌对流，达到强化混合过程的目的； 热扰动：改变扩散系数D，如利用热泡产生流体扰动，以强化混合过程,主动式,.,（四）混合效果评价,.,混合效果评价可视化方法,标记物技术,共聚

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