CAREER: Understanding thermal transport across phase-change interfaces via in situ micro-Raman thermography

职业：通过原位显微拉曼热成像了解相变界面上的热传输

• 批准号: 2047727
• 负责人: Yangying Zhu
• 金额: $ 50万
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-04-01 至 2026-03-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2047727&HistoricalAwards=false
• 关键词: CAREER; Understanding; thermal; transport; across

Liquid-vapor phase change including evaporation, boiling and condensation are utilized in power generation, cooling of micro-electronics, and thermal control of buildings. The advancement of nanotechnology over the last decade has enabled nanoengineered devices with superior heat transfer performance. Although the thermal performance at the macroscale system level can be measured, understanding what happens at the phase change boundary at the microscale is necessary to design the next-generation thermal devices. The overarching goal of this research is to develop a temperature measurement technique that can directly probe phase change region, and to further understand the microscopic mechanisms of liquid-vapor phase-change thermal transport in the presence of nanostructures. The proposed research will be integrated into education and mentoring activities by incorporating hands-on projects into high school and undergraduate teaching, hosting undergraduate researchers and developing new graduate courses. Furthermore, the project plans to broaden the real-world impact of thermo-fluids engineering by studying the transmission of infectious diseases through respiratory droplets from the perspective of heat and mass transfer.The proposed research aims to develop a novel platform, based on micro-Raman spectroscopy interfaced with a thermofluidic chamber, for in-situ measurement of temperature near the solid-liquid-vapor contact line with unprecedented accuracy and spatial resolution. This platform allows one to (i) investigate the role of surface micro and nanostructures in promoting the thermal transport across phase-change interfaces, (ii) develop multi-length-scale structures to maximize the heat transfer coefficient and the critical heat flux simultaneously, and (iii) understand phase change processes associated with high temperature gradients by detailed temperature mapping. The proposed research will bridge the gap between macroscopic thermal characterization and precise thermal measurement at the microscale. The fundamental insights gained through this work will lead to highly effective phase change devices. In addition, the in situ, local temperature measurement method will be a general platform to investigate phase change processes including condensation, frosting, and boiling, contributing broadly to the advancement of phase change heat transfer.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.

液态蒸气相变化，包括蒸发，沸腾和冷凝水，用于发电，微电机冷却以及建筑物的热控制。在过去的十年中，纳米技术的进步使纳米工程设备具有出色的传热性能。尽管可以测量宏观系统级别的热性能，但要了解微观时期的相变边界上发生的事情对于设计下一代热设备是必要的。这项研究的总体目标是开发一种可以直接探测相变区域的温度测量技术，并进一步了解在纳米结构存在下液体蒸气相变热传输的微观机制。拟议的研究将通过将动手项目纳入高中和本科教学，主持本科研究人员并开发新的研究生课程来纳入教育和指导活动。此外，该项目计划通过从热量和传播的角度研究通过呼吸液滴研究传染病的传播，从而扩大热流体工程的现实影响前所未有的准确性和空间分辨率。该平台允许（i）研究表面微观和纳米结构在促进跨相变界面的热传输中的作用，（ii）开发多长度尺度结构，以同时提高热传递系数和关键的热量通量，并且（iii）了解与高度毕业生相关的相位变化过程。拟议的研究将弥合宏观热表征与微观尺度上精确的热测量之间的差距。通过这项工作获得的基本见解将导致高效的相变设备。此外，原位，局部温度测量方法将是研究相变过程的一般平台，包括冷凝，糖霜和沸腾，这广泛促进了相变热传递的进步。该奖项反映了NSF的法定任务，并被认为是通过基金会的智力功能和广泛影响的评估来评估的，并被视为值得通过评估的支持。

项目成果

Manipulation of droplets and bubbles for thermal applications

• DOI: 10.1002/dro2.21
• 发表时间: 2022-10-01
• 期刊: DROPLET
• 作者: Liang, Xichen;Kumar, Vijay;Zhu, Yangying
• 通讯作者: Zhu, Yangying

Salt-rejecting continuous passive solar thermal desalination via convective flow and thin-film condensation

• DOI: 10.1016/j.xcrp.2023.101682
• 发表时间: 2023-05
• 期刊: Cell Reports Physical Science
• 影响因子: 8.9
• 作者: Patrick I. Babb;S. Ahmadi;Forrest Brent;Ruby Gans;M. Lopez;Jiuxu Song;Qixian Wang;Brandon Zou;Xiang-Yun Zuo;A. Strom;Jaya M. Nolt;Tyler Susko;K. Fields;Yangying Zhu