CAREER: Microscale Two-Phase Zeotropic Flow in Energy Systems

摘要提案编号：CTS-0238841主要研究者： Laura Schaefer所属机构： 剑桥大学提案标题：职业：能源系统中的微尺度两相非共沸流动PI将研究微通道和小通道中两相非共沸混合物的耦合传热和流体流动行为。非共沸混合物的不同之处在于，它们的液相和气相的浓度在两相区域中连续变化。浓度分布之间的温度滑移可以导致汽液界面处的组分累积和温度与焓的显著非线性轮廓。在微观尺度上，分子间相互作用的增加会加剧这些行为。这些混合物的热力学，传热和流体流动特性将通过理论建模，数值模拟和实验观察进行研究。该项目的结果将提供创建有效的微型蒸汽压缩和吸收循环，泵送机制和提取设备所需的工具。这项研究还可用于提高利用微加工组件的热交换器的效率，这可能对能源消耗产生的成本和排放产生很大影响。这些类型的能源应用吸引了关注环境的学生和对当前技术感兴趣的学生。高中，本科和研究生将通过四层综合方法介绍能源系统。 该提案由化学和运输系统司的热运输和热处理方案资助。

AbstractProposal Number: CTS-0238841Principal Investigator: Laura SchaeferAffiliation: University of PittsburghProposal Title: CAREER: Microscale two-phase zeotropic flow in energy systemssThe PI will investigate the coupled heat transfer and fluid flow behavior of two-phase zeotropic mixtures in micro- and minichannels. Zeotropic mixtures are distinct in that the concentrations of their liquid and vapor phases are continually changing in the two-phase region. The temperature glide between the concentration profiles can cause both component accumulation at the vapor-liquid interface and drastically nonlinear temperature versus enthalpy contours. On the microscale, these behaviors can be exacerbated by the increased effect of intermolecular interactions. The thermodynamic, heat transfer, and fluid flow properties of these mixtures will be studied through theoretical modeling, numerical simulation, and experimental observation. The results of this project will provide the tools needed to create effective miniature vapor compression and absorption cycles, pumping mechanisms, and extraction devices. This research can also be used to increase the efficiency of heat exchangers that utilize micromachined components, which may have a large impact on the costs and emissions generated by energy consumption. These types of energy pplications are appealing to students who are concerned about the environment and to students who are interested in current technology. High school, undergraduate, and graduate students will be introduced to energy systems through a four-tier integrated approach. The proposal has been funded by the Thermal Transport and Thermal Processing Program of the Chemical and Transport Systems Division.