GOALI/Collaborative Research: Fundamentals of Microemulsion Boiling: from Interfacial Thermodynamics to Multiphase Heat Transfer

该合作项目的目标是研究微乳中核沸腾的基本机制，并评估其在工业相关冷却系统中的性能和可靠性。pi已经确定了一种有趣的微乳液流体，其中挥发性液体作为自组装液滴分散到另一种不混溶的非挥发性液体中，作为增强相变传热的候选者。研究发现，以聚α烯烃为基础的微乳液的池沸临界热流密度比以聚α烯烃为基础的微乳液高80%左右。为了合理设计微乳液作为传热流体，并充分发挥其在沸腾中的潜力，本项目将进行三个相互交织的活动。首先，pi将研究微乳在高温下的界面热力学，并了解微乳中相变的能量学。其次，pi将通过结合实验表征和数值模拟来研究微乳液沸腾的传热机制。研究将重点放在与经典池沸腾有很大不同的特殊气泡动力学上。第三，通过与工业伙伴的合作，pi将评估微乳液沸腾在工业相关环境下的性能。提出的研究具有潜在的变革性：通过引入微乳液作为传热流体，其沸腾行为与经典沸腾有质的不同，这项工作开创了一种全新的方法来增强沸腾传热。拟议的研究有助于解决高热流密度冷却的长期挑战，并可能使许多受当前冷却瓶颈限制的技术取得新的突破。特别是，这项研究可以极大地有利于两个工业部门：电子热管理和工业热交换器。在马里兰大学、克莱姆森大学及其工业合作伙伴之间启动GOALI合作伙伴关系，将大大提高他们的研究能力，并促进微乳液在工业热管理系统中的应用。拟议的项目将与马里兰大学和克莱姆森大学的教育活动密切相关，通过培训学生进行跨学科研究，扩大代表性不足群体在研究中的参与，以及K-12外展。在实施这些活动时，学院将着重于通过工程科学前沿的研究拓宽学生的视野，并让学生接触现实生活中的行业问题。这些活动将通过充分利用现有的机构资源和利用与工业伙伴的协作来进行。

1336778/1336590PI: Yang/QiaoThe objective of this collaborative GOALI project is to investigate the fundamental mechanisms of nucleate boiling in microemulsions and to evaluate their performance and reliability in industry-relevant cooling systems. The PIs have identified an interesting microemulsion fluid, in which a volatile liquid is dispersed into another immiscible nonvolatile liquid as self-assembled droplets, as a candidate for enhanced phase change heat transfer. It has been observed that the polyalphaolefin-based microemulsion fluids exhibit a pool boiling critical heat flux (CHF) about 80% higher than the base fluid polyalphaolefin. To enable the rational design of microemulsions as heat transfer fluids and to fully exploit their potential in boiling, three interwoven activities will be carried out in this project. First, the PIs will investigate the interfacial thermodynamics of microemulsions at elevated temperatures and understand the energetics of phase change in microemulsions. Second, the PIs will investigate the heat transfer mechanisms of microemulsion boiling by integrating experimental characterization and numerical simulations. The research will focus on the peculiar bubble dynamics that differ greatly from those in classical pool boiling. Third, the PIs will evaluate the performance of microemulsion boiling under industry-relevant settings through collaboration with industrial partners. The proposed research is potentially transformative: by introducing microemulsions as heat transfer fluids, whose boiling behavior differs qualitatively from classical boiling, this work pioneers a radically new approach for enhancing boiling heat transfer. The proposed research helps resolve a long-standing challenge in high-heat flux cooing and can potentially enable new breakthroughs in many technologies limited by current bottlenecks in cooling. In particular, this research can greatly benefit two industrial sectors: thermal management of electronics and industrial heat exchangers. Initiating the GOALI partnership between University of Maryland, Clemson University and their industrial partner will greatly enhance their research capabilities and facilitate the application of microemulsions in industrial thermal management systems. The proposed project will be tied closely with the education activities at University of Maryland and Clemson University through training students in interdisciplinary research, broadening the participation of underrepresented groups in research, and K-12 outreach. When implementing these activities, the PIs will focus on broadening the horizons of students through research at frontiers of engineering sciences and exposing students to real-life industry problems. These activities will be carried by making full use of available institutional resources and by leveraging collaboration with industrial partner.