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首页> 外文期刊>Journal of Micromechanics and Microengineering >Pressure measurements with molecule-based pressure sensors in straight and constricted PDMS microchannels
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Pressure measurements with molecule-based pressure sensors in straight and constricted PDMS microchannels

机译：在直的和狭窄的PDMS微通道中使用基于分子的压力传感器进行压力测量

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摘要

This paper presents the validation of molecule-based pressure sensors in straight PDMS microchannel and further applications on acquiring the detailed pressure profiles in constricted PDMS microchannel. The experimental technique using molecule-based pressure sensor has been applied in various microscale measurements; however, deviations between theoretical and experimental results were also reported. The inconsistency is most likely due to the rough and heterogeneous channel surfaces. To validate the experimental technique with classic straight microchannel flow, the pressure distributions were measured at Reynolds numbers ranging from 10 to 86, and Knudsen numbers ranging from 0.0015 to 0.014. The experimental results acquired in the straight microchannel show excellent agreements with analytical solutions obtained from Navier-Stokes equations and first-order slip boundary condition. The pressure profiles acquired in the constricted microchannel show an apparent pressure drop, which indicates the flow recirculation, near the constriction area. The pressure recovery after the constriction structure was delayed further with increasing flow rate. There were more than 3000 data points acquired inside the 1 cm long PDMS microchannel from the entrance to the exit and 33 data points were acquired across the microchannel width 100 μm. Detailed resolution up to 3 μm per pixel in the local pressure evolution has been realized in the current experimental setup using a standard camera lens and extension tubes.
机译：本文介绍了直线型PDMS微通道中基于分子的压力传感器的验证，以及在狭窄的PDMS微通道中获取详细压力曲线的进一步应用。使用基于分子的压力传感器的实验技术已应用于各种微尺度测量;但是，理论和实验结果之间也存在偏差。不一致最可能是由于粗糙且异质的通道表面造成的。为了验证经典的直接微通道流动的实验技术，在雷诺数为10到86，克努森数为0.0015到0.014的范围内测量了压力分布。在直线微通道上获得的实验结果与从Navier-Stokes方程和一阶滑移边界条件获得的解析解显示出极好的一致性。在收缩的微通道中获得的压力曲线显示出在收缩区域附近的表观压降，这表明流体再循环。收缩结构后的压力恢复随着流速的增加而进一步延迟。从入口到出口，在1厘米长的PDMS微通道内采集了3000多个数据点，并且在100μm的微通道宽度上采集了33个数据点。在当前的实验装置中，使用标准摄像机镜头和延长管已实现了局部压力演变中每个像素高达3μm的详细分辨率。

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