Thermo-liquid crystal (TLC) thermography for the 3D temperature characterization of liquid microflows

用于液体微流 3D 温度表征的热液晶 (TLC) 热成像

• 批准号: 329301939
• 负责人: Professor Dr. Christian Joachim Kähler
• 金额: --
• 依托单位: Institut für Strömungsmechanik und Aerodynamik (LRT-7)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/329301939?language=en
• 关键词: Thermo; liquid; crystal; TLC; thermography

The field of microfluidics is growing exponentially as is its impact in modern industrial applications ranging from the pharmaceutical/medical sector, to consumer electronics, reaching all the way to aerospace and large scale machinery. A great amount of such microfluidics applications, involve heat transfer solutions which employ sophisticated microfluidic devices with complex geometries and flow structures. However, all these innovations have been developed in the absence of an experimental time-resolved means of simultaneously characterizing the 3D velocity and temperature fields of the flow that runs through the microfluidic chips. The ability to understand the flow with this degree of precision will empower scientist and engineers to correct mistakes and device failures before they happen and save substantial costs in development of complex designs.The aim of this research project is to further develop the thermo-liquid crystal (TLC) thermography measurement technique in order to materialize the long awaited simultaneous 3D reconstruction of temperature and velocity fields in liquid flows. Over the last few years, the foundation of the method has been laid out, but further improvements in the fabrication of the TLC particles, acquisition hardware and software, color evaluation algorithms and calibration procedures are necessary to bring the technique to the point where flows in real industrial and scientific applications can be measured reliably. Furthermore, critical questions regarding the nature and color response of the TLC materials, which have remained unanswered for many years, will also be assessed but also the time response of their color signal and the effect of strong shear forces on their color will be examined.

微流体领域正呈指数级增长，其在现代工业应用中的影响也在不断扩大，从制药/医疗部门到消费电子产品，一直到航空航天和大型机械。大量的这种微流体应用涉及传热解决方案，其采用具有复杂几何形状和流动结构的复杂微流体装置。然而，所有这些创新都是在缺乏实验性时间分辨手段的情况下开发的，该实验性时间分辨手段同时表征流过微流体芯片的流的3D速度和温度场。以这种精确度理解流动的能力将使科学家和工程师能够在错误和设备故障发生之前纠正错误和设备故障，并节省开发复杂设计的大量成本。热成像测量技术，以实现期待已久的同时三维重建的温度和速度场的液体流动。在过去的几年中，该方法的基础已经奠定，但在TLC颗粒的制造，采集硬件和软件，颜色评估算法和校准程序的进一步改进是必要的，使该技术的点，在真实的工业和科学应用中的流量可以可靠地测量。此外，关于TLC材料的性质和颜色响应的关键问题，多年来一直没有答案，也将进行评估，但也将检查其颜色信号的时间响应和强剪切力对其颜色的影响。