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Multi-phase microfluidic experiments

多相微流控系统是包含两种及两种以上流体或相态的微流控系统，其流道的典型尺度在纳米到亚毫米量级。因其所需流体量少，热质传输响应速率快，产生污染物少等优点，被应用于航天热控、生物芯片、医疗、化工、能源等各个领域。但因流体细小、速度快，存在研究时无法直接清晰观测其流体运动状态和流体运动流速的痛点。


中科院化学所乔燕教授研究多相微流体试验时，利用千眼狼高速摄像机与显微镜组合拍摄观察微流体中液滴状态及液体流速。此次试验将高速摄像机通过C口转接环连接显微镜镜头上方，以10倍放大倍数清晰拍摄微流体控制过程，如图1所示。

图片

图1 试验现场

高速摄像机可以每秒1000~10000帧的速度记录，可拍摄整个流体流动过程的动态画面，并能取得精确的微流体尺寸和速度信息。试验中通过千眼狼高速摄像分析系统慢放观看微流体中液滴运动过程，如图2所示，并分析得到微流体试验时液相油相不同配比流速时的实验数据，包括液滴直径，液滴数量等相关数据。

图片

图2 慢放帧画面


多相微流体系统研究对微流控技术发展非常关键。如何建立多相微流体系统相关研究基础理论，解析其反应过程与机制，实现对流体流动及反应的精准调控，高速摄像机及测量技术可在此研究过程中发挥重要作用。


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