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从能量平衡的角度建立了静电驱动柔性振膜微泵的平衡方程,基于对压缩过程中振膜动能的考虑,改进了最小能量法压缩模型,结合均匀压力载荷下圆薄膜大挠度形变理论对静电驱动柔性振膜微泵进行理论分析.对振膜与腔体壁面贴合的压缩过程中各能量相互转化的关系进行分析,并与最小能量法模型进行了对比.结果表明,能量平衡法考虑了薄膜振动过程中的动能,故薄膜与腔体具有更大的贴合面积,且以薄膜与腔体完全贴合时作为零应力参考状态降低压缩过程中的薄膜形变势能,计算得到的静电微泵的压缩效率更高,在驱动电压为300 V时,改进的双腔模型中振膜贴合半径为4.06 mm,所得最大压升为87.08 kPa.基于改进的模型,对双腔微泵压升的影响因素进行讨论,发现降低柔性薄膜厚度会使输出压力有所上升,并且减小腔体表面介电层厚度、减小腔体深度与半径可以有助于提高微泵的压升. 相似文献
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H.K. MaAuthor Vitae H.C. SuAuthor VitaeJ.Y. WuAuthor Vitae 《Sensors and actuators. A, Physical》2011,171(2):297-305
Previous studies have indicated that a one-sided actuating piezoelectric micropump (OAPMP) combined with two valves may enhance the liquid flow rate to 4.1 ml/s and make it possible to reach the maximum pump head of 9807 Pa in a limited space. In this study, an innovative one-sided actuating piezoelectric valveless micropump (OAPMP-valveless) has been developed to actuate fluid at a higher flow rate in one direction by adding a secondary chamber. The secondary chamber plays a key role in the application of the valveless micropump: the flow rate of the pump can reach 0.989 ml/s by adding a secondary chamber. The maximum pump head is 1522.5 Pa when using the 0.3 mm-thick secondary diaphragm and the 0.5 mm-thick primary diaphragm. In addition, if a nozzle/diffuser element is applied to the OAPMP-valveless with a secondary chamber, the flow rate can be further improved to 1.183 ml/s at a frequency of 150 Hz. A three-dimensional numerical model of the valveless micropump has been built to compare the measured results with the simulated results. 相似文献
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Micromixers to produce cosmetic emulsions 总被引:1,自引:0,他引:1
Tromeur M Mahé C Schwesinger N Tranchant JF 《International journal of cosmetic science》2003,25(1-2):1-4
In the cosmetics industry, emulsions play a key-role in active solubilization and texture/efficacy optimization. However, depending on their physico-chemical properties, the active ingredients are often more stable in a single phase: for example, Vitamin A is more stable in an oily phase than in a water phase. We have developed a special mixing device which produces an emulsion in the body of the pump, immediately before application on the skin. The mixing unit consists of two silicon chips. Each chip has several Y-shaped microchannels and intersections etched on its upper surface. When the two etched surfaces are bonded together, they produce series of interconnecting micromixing elements which permit the repeat mixing of the two phases, thus producing an extremely homogenous emulsion. These micromixers require carefully designed formulae in which the physico-chemical properties of each raw material are essential to obtain a spontaneous emulsion. This device has been incorporated into a spray pack and optimized to deliver the spontaneous emulsion when finger pressure is applied. 相似文献
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