Heat and Mass Transport in Horizontal Two Phase He II Vapor

摘要 提案编号：CTS-9806725 主要研究者：S.货车西弗 氦II或超流氦是一种存在于2.2K以下的独特流体。 在其他属性中，He II具有极高的导热性，并遵守非线性热方程。 这一特性鼓励了He II在许多技术设备中的使用，包括超导磁体和空间仪器。 到目前为止，大部分的工作，他二集中在单相流体中的传热和传质的研究，重点是稳态和瞬态传热在静态和强制流动。 在拟议的工作中，这将扩大到包括共存的He II/饱和蒸汽，而在水平流。 将开发一个水平实验测试设备，以测量蒸汽质量、空隙率、质量流量和传热速率的影响。 实验结果将进行比较的基础上开发的基本属性的He II和蒸汽的模型。 建模工作将提供有关传统两相流模型局限性的信息以及对He II传输特性的基本了解。

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.