Heat and Mass Transport in Horizontal Two Phase He II Vapor

摘要建议编号：CTS-9806725首席研究员：S·范·西弗氦II，或超流氦，是一种存在于2.2K以下的独特流体。在其他性质中，He II具有极高的导热系数，并遵循非线性热方程。这一特性鼓励了He II在一些技术设备中的使用，包括超导磁体和基于空间的仪器。到目前为止，对He II的研究主要集中在单相流体中的传热传质研究，重点放在静态和强迫流动下的稳态和暂态换热。在拟议的工作中，这将扩大到包括水平流动时共存的He II/饱和蒸汽。将开发一台水平实验测试装置来测量蒸汽质量、含气率、质量流量和传热率的影响。实验结果将与根据He II和蒸汽的基本性质开发的模型进行比较。模拟工作将提供有关常规两相流模型的局限性和对He II输运性质的基本理解的信息。

Abstract Proposal Number: CTS-9806725 Principal Investigator: S. Van Sciver Helium II, or superfluid helium, is a unique fluid existing below 2.2K. Among other properties, He II has an extremely high heat conductivity and obeys a non-linear heat equation. This property has encouraged the use of He II in a number of technical devices including superconducting magnets and spaced based instruments. To date, most work on He II focussed on studies of heat and mass transport in the single phase fluid with emphasis on steady state and transient heat transfer in static and forced flow. In the proposed work, this will be expanded to include coexisting He II/saturated vapor while in a horizontal flow. A horizontal experimental test facility will be developed to measure the effects of vapor quality, void fraction, mass flow, and heat transfer rates. Experimental results will be compared to models developed based on the fundamental properties of the He II and the vapor. The modeling effort will provide information on the limits to conventional two phase flow models and the basic understanding of the transport properties of He II.