Simultaneous velocity profile and temperature profile measurements in microfluidics
Simultaneous velocity profile and temperature profile measurements in microfluidics
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DOI：
10.1016/j.flowmeasinst.2021.102106
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发表时间：
2022-01-08
影响因子：
2.2
通讯作者：
Buettner, Lars
中科院分区：
文献类型：
--
作者：
Burkle, Florian;Czarske, Jurgen;Buettner, Lars
同时非侵入式测量流动中的温度和速度具有很高的技术意义，例如。 g。研究微流体环境中的传热。然而，迄今为止，尚未演示在单个设备中提供低速度不确定性和微米空间分辨率以及高精度温度测量的测量系统。在这项工作中，这个问题通过将激光多普勒速度剖面传感器 (LDV-PS) 与激光诱导荧光 (LIF) 相结合来解决。使用含有荧光染料铀和罗丹明 B 的晶种颗粒。多种染料方法消除了液滴尺寸的影响。在演示气流实验中，相对速度不确定性低至 0.4%，温度不确定性低至 0.24 摄氏度，空间分辨率为 10 μm。该方法有可能针对不同的温度范围和不确定性要求进行优化，使其适用于燃料电池或微生物反应器等广泛的热流。更好地了解热交换过程可以提高微流体装置的能源效率。
Simultaneous non-intrusive temperature and velocity measurements in flows are of high technological interest, e. g. to study the heat transfer in microfluidic environments. However, a measurement system that offers a low velocity uncertainty and micrometre spatial resolution as well as highly accurate temperature measurements in a single device has not been demonstrated so far. In this work, this problem is solved by combining a Laser Doppler Velocity Profile Sensor (LDV-PS) with Laser-Induced Fluorescence (LIF). Seeding particles are employed, that contain the fluorescent dyes uranine and rhodamine B. The multiple dye approach eliminates the influence of the droplet size. Relative velocity uncertainties of down to 0.4% and a temperature uncertainty of down to 0.24 degrees C with a spatial resolution of 10 mu m are achieved in a demonstration air flow experiment. The method has the potential to be optimised for different temperature ranges and uncertainty requirements, making it applicable on a wide range of thermal flows like fuel cells or microbioreactors. A better understanding of heat exchange processes can improve the energy efficiency of microfluidic devices.