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首页> 外文期刊>International Journal of Heat and Mass Transfer >Development and testing of a constructal microchannel flow system with dynamically controlled complexity
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Development and testing of a constructal microchannel flow system with dynamically controlled complexity

机译：动态控制复杂性的结构化微通道流系统的开发和测试

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A microfluidic device containing a constructal-based branched flow structure with an externally controllable complexity was developed and tested in this study. The device was fabricated in the form of a 10 mm square by 9 mm high monolithic silicon/polydimethylsiloxane (PDMS) test section which contains three interconnected flow channels in a tee configuration. Before and after branching, the flow channels have widths of 464 and 249 urn respectively, and a uniform height of 195 μm. The complexity of the flow structure is changed by rerouting the flow of fluid using three pneumatically actuated micr-ovalves that are incorporated into the test section. The microvalves, which are positioned in strategic locations within the test section, are made of a 48 urn thick PDMS membrane and have a diameter of 2 mm. Experiments were run aiming to characterize the pneumatic and mechanical properties of the valves. A separate series of experiments were performed to determine how the hydrodynamic and thermal performance of the test section was affected by the flow channel configuration, which was controlled by opening and/or closing the valves. The data collected showed that the valve design was robust and the mechanical integrity of the microvalve's membrane is far beyond what is required by the operational conditions (e.g., control pressures and deflections) considered in the present experiments. Also, as expected, the results show that the hydraulic losses and the amount of heat transferred through the channels is highly affected by the flow channel footprint. These results demonstrate, in principle, a means by which the complexity of a branched flow structure could be dynamically controlled in order to maintain an optimal configuration when operational conditions vary.
机译：本研究开发并测试了一种微流体设备，该设备包含具有外部可控复杂性的基于结构的分支流动结构。该设备以10平方毫米乘9毫米高的整体式硅/聚二甲基硅氧烷（PDMS）测试部分的形式制造，该测试部分包含三通配置的三个互连流动通道。在分支之前和之后，流道的宽度分别为464和249 urn，均匀高度为195μm。使用包含在测试部分中的三个气动微动-微球来重新引导流体的流动，从而改变了流动结构的复杂性。放置在测试区内关键位置的微型阀由48微米厚的PDMS膜制成，直径为2毫米。进行实验旨在表征阀门的气动和机械性能。进行了一系列单独的实验，以确定测试部分的流体力学和热性能如何受到流道配置的影响，该流道配置是通过打开和/或关闭阀门来控制的。收集的数据表明，阀的设计是坚固的，并且微阀膜的机械完整性远远超出了本实验中考虑的操作条件（例如，控制压力和挠度）的要求。同样，正如预期的那样，结果表明，水力损失和通过通道传递的热量受流动通道覆盖面积的很大影响。这些结果原则上证明了一种手段，通过该手段可以动态地控制分支流动结构的复杂性，以便在操作条件变化时保持最佳配置。

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