CAREER: Vapor-Liquid Separation for Sustainable Condensation Heat Transfer

职业：用于可持续冷凝传热的汽液分离

基本信息

批准号：
2044348
负责人：
Xianming Dai
金额：
$ 51.71万
依托单位：
University of Texas at Dallas
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：
2021-06-15 至 2026-05-31
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2044348&HistoricalAwards=false
关键词：
CAREER Vapor Liquid Separation Sustainable

项目摘要

Improving the performance of condensation heat transfer reduces size, weight, and cost in refrigeration, air conditioning, heat exchangers, and thermal management systems. To achieve a large heat transfer coefficient, condensates on a surface must be rapidly removed to provide liquid-free areas for vapor-liquid phase change to occur. The ideal surface is one that provides a large heat transfer area and rapidly removes condensates for sustainable condensation. Present challenges include the removal of ultralow surface tension refrigerants and the lack of long-term durability of engineered surfaces. The goal of this CAREER project is to address those challenges by developing a vapor-liquid separation process to advance condensation heat transfer of ultralow surface tension fluids, and integrate the new knowledge into education to train the next generation of heat transfer leaders.The objective of this project is to achieve: (1) dropwise condensation of ultralow surface tension fluids (e.g., R134a), and (2) sustainable vapor-liquid separation that provides large liquid-free areas for rapid condensation. The proposed approach will use the newly developed durable quasi-liquid surface to achieve dropwise condensation and rapid removal of ultralow surface tension condensates. The super slippery quasi-liquid surface will prevent the dropwise to filmwise transition. To achieve a high heat transfer performance, the vapor and liquid will be separated on a slippery rough surface with quasi-liquid lubrication which will provide a large surface area for condensation. X-ray nano-imaging will be used to investigate the nucleation and liquid removal inside microstructures of the slippery rough surfaces. The surface durability and sustainable condensation performance of quasi-liquid lubricated microstructures will be studied under various subcooling and shear stress conditions. The preliminary results in heat transfer and materials fabrication provide a solid foundation to execute those activities. The proposed project is in line with the PI’s long-term career goal to address heat transfer challenges by incorporating learning from multidisciplinary areas.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.

提高冷凝传热性能可以减小制冷、空调、热交换器和热管理系统的尺寸、重量和成本。为了实现较大的传热系数，必须快速去除表面上的冷凝物以提供无液体区域。理想的表面是一种能够提供大的传热面积并快速去除冷凝物以实现可持续冷凝的表面。目前的挑战包括去除超低表面张力制冷剂和缺乏。该职业项目的目标是通过开发汽液分离工艺来解决这些挑战，以促进超低表面张力流体的冷凝传热，并将新知识融入教育中以培训下一代。该项目的目标是实现：(1) 超低表面张力流体（例如 R134a）的逐滴冷凝，以及 (2) 可持续的汽液分离，提供大量所提出的方法将使用新开发的耐用准液体表面来实现滴状冷凝和超低表面张力冷凝物的快速去除，超滑的准液体表面将防止滴状向膜状过渡。实现高传热性能，蒸汽和液体将在具有准液体润滑的光滑粗糙表面上分离，这将为冷凝提供大的表面积。 X射线纳米成像将用于研究光滑粗糙表面微观结构内部的成核和液体去除，对各种过冷和剪切应力条件下的准液体润滑微观结构的表面耐久性和可持续凝结性能进行初步研究。传热和材料制造方面的成果为执行这些活动奠定了坚实的基础。拟议的项目符合 PI 的长期职业目标，即通过结合多学科的学习来应对传热挑战。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。