EAGER: Development of prompt molecular tagging velocimetry and thermometry

该项目旨在利用激光诊断的最新发展，开发一种新的方案，以前所未有的分辨率测量复杂流动中的传热。这将是首次演示直接测量湍流与温度的结合。这项新技术将为深入了解这一重要现象提供一种工具，并将导致新模型的发展，以改进许多过程的操作。例如，流体从热表面传输热量的能力直接影响许多系统（例如，太阳能电池板，核反应堆，计算机芯片，电动汽车电池）的效率或影响运动物体（例如，海军舰艇，飞机，汽车）的阻力。本研究的主要目的是利用分子标记测速技术的最新发展，进一步将分子标记测速技术扩展到温度测量领域，从而实现湍流边界层热通量的时间分辨和空间分布感知。这项研究将利用MTV的光谱特性来选择染料和测量方案，使温度场的分辨率，而不是惰性染料。在MTV计划中增加测温将首次能够以瞬时方式和在许多工业流动的最小尺度上测量温度和速度场。该项目将在局部加热的湍流通道中演示该技术。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

This project aims to take advantage of the latest developments in laser diagnostics to develop a new scheme to measure heat transfers in complex flows at an unprecedented resolution. This will represent the first demonstration of the direct measurement of turbulent flow combined with temperature. The new technique will provide a tool to shed insights into this important phenomenon and will lead to the development of new models to improve the operation of many processes. For example, the ability of a fluid to transport heat away from hot surfaces directly affects the efficiency of many systems (e.g., solar panels, nuclear reactors, computer chips, electric car batteries) or affect the drag of moving bodies (e.g., naval ships, airplanes, automobiles).The main objective of the proposed work is to take advantage of the latest developments in the design of molecular tagging velocimetry (MTV) to further expand MTV to thermometry with the ability to achieve time-resolved and spatially distributed sensing of heat fluxes in turbulent boundary layers. The research will take advantage of the spectroscopic nature of MTV to select dye and measurement schemes that enable the resolution of the temperature field, instead of an inert dye. The addition of thermometry to the MTV scheme will enable for the first time to measure temperature and velocity fields in an instantaneous manner and at the smallest scales of relevance for many industrial flows. The project will demonstrate the technique in a locally heated turbulent channel flow.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.