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

• 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

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减少制冷、空调、热交换器和热管理系统的尺寸、重量和成本。为了实现大的传热系数，必须快速去除表面上的冷凝物，以提供用于发生汽-液相变的无液体区域。 理想的表面是一个提供大的传热面积，并迅速消除冷凝可持续冷凝。目前的挑战包括超低表面张力制冷剂的去除和工程表面缺乏长期耐用性。CAREER项目的目标是通过开发一种汽液分离工艺来解决这些挑战，以提高超低表面张力流体的冷凝传热，并将新知识融入教育中，培养下一代传热领导者。该项目的目标是实现：（1）超低表面张力流体（例如，R134 a），以及（2）可持续的气液分离，其提供用于快速冷凝的大的无液体区域。所提出的方法将使用新开发的耐用准液体表面，以实现滴状冷凝和超低表面张力冷凝物的快速去除。超光滑的准液体表面将阻止滴状到膜状转变。为了实现高传热性能，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射线纳米成像将被用来研究光滑粗糙表面的微结构内部的成核和液体去除。研究了准液体润滑微结构在不同过冷度和剪切应力条件下的表面耐久性和可持续冷凝性能。传热和材料制造的初步结果提供了坚实的基础，执行这些活动。该项目符合PI的长期职业目标，即通过整合多学科领域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。

项目成果

Microchannel-elevated micromembrane for sustainable phase-separation condensation

• DOI: 10.1016/j.joule.2022.11.010
• 发表时间: 2022-12
• 期刊: Joule
• 影响因子: 39.8
• 作者: Li Shan;Zongqi Guo;D. Monga;Dylan Boylan;X. Dai

Quasi-Liquid Surfaces for Sustainable High-Performance Steam Condensation

• DOI: 10.1021/acsami.2c00401
• 发表时间: 2022-03-23
• 期刊: ACS APPLIED MATERIALS & INTERFACES
• 影响因子: 9.5
• 作者: Monga, Deepak;Guo, Zongqi;Dai, Xianming
• 通讯作者: Dai, Xianming