CAREER: Microscale Two-Phase Zeotropic Flow in Energy Systems

摘要项目申请号：cts -0238841项目负责人：Laura schaefer单位：匹兹堡大学项目名称：微尺度两相共沸流体在能量系统中的流动项目将研究两相共沸混合物在微通道和小通道中的耦合传热和流体流动行为。共沸混合物的不同之处在于其液相和气相的浓度在两相区不断变化。浓度分布之间的温度滑动会导致汽液界面的组分积累和温度焓曲线的急剧非线性。在微观尺度上，这些行为会因分子间相互作用的增加而加剧。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。该项目的成果将为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提供所需的工具。这项研究还可用于提高利用微机械部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重大影响。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、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分部的热传输和热处理项目资助。

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.