CAREER: Microscale Two-Phase Zeotropic Flow in Energy Systems

提案编号：CTS-0238841主要研究员：Laura Schaefer从属：匹兹堡大学Proposal标题：Career：能源系统中的微尺度两相共沸流动PI将研究微型和微型通道中两相共沸混合物的耦合换热和流体流动行为。共沸混合物的不同之处在于，其液体和汽相的浓度在两相区域内不断变化。浓度分布之间的温度滑移会导致汽液界面组分的积累，以及温度对热焓等值线的严重非线性。在微观尺度上，分子间相互作用的增强效应可能会加剧这些行为。通过理论建模、数值模拟和实验观察，研究这些混合物的热力学、传热学和流体流动特性。该项目的成果将提供创造有效的微型蒸汽压缩和吸收循环、泵送机构和抽气装置所需的工具。这项研究还可以用来提高使用微机械部件的热交换器的效率，这可能会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对关心环境的学生和对当前技术感兴趣的学生很有吸引力。高中生、本科生和研究生将通过四级综合方法学习能源系统。该提案由化学和运输系统司的热运输和热处理方案提供资金。

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.