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热汽泡驱动无阀微泵操作特性的数值模拟

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摘要 本文使用CFD软件FLUENT,研究了一种新型电加热方法产生热力汽泡驱动的无阀微泵.得出了不同加热壁面过热度下泵流量和泵压与驱动频率的关系.无阀微泵200μm深,驱动腔为直径1mm的圆腔,一对最窄为30μm最宽为271μm、张角7°的微扩管被分别连接到驱动腔,工质为甲醇,采用层流模型.研究表明不同加热壁面过热度有不同的最大流量驱动频率,在过热度为ΔT=15°C时,最大体积流量为9.02μL/min,最大的泵压为680Pa.随着壁面过热度增加,包含汽泡生长和冷凝周期的时间会变长,导致泵送的流量受到显著影响;不同的壁面过热度有不同的最佳驱动频率,过热度增加,最大的泵送流量和压力会增加而且有相似的变化趋势,最佳驱动频率会降低;供液期较泵送期长.
出处 《中国科学(E辑)》 CSCD 北大核心 2009年第11期1870-1874,共5页 Science in China(Series E)
基金 国家自然科学基金(批准号:50406012)资助项目
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