Prediction and Attainment Capability for Quasi-Steady Internal Condensing Flows: An Integrated Experimental/Computational Approach

提案编号： CTS-0086988主要研究者：A.在给定进口压力、质量流量和冷凝表面温度分布的情况下，管内稳态或准稳态环形或分层内部冷凝流的实现取决于冷凝器段排热率与出口压力条件或出口蒸汽流量分数之间的相容性。 对于某些出口条件，准定常波界面流实现，并在其他条件下，显着的压缩性诱导的振荡将持续。这些未解决的问题将实验研究的帮助下，电子流量控制技术，帮助确定的条件范围内的准稳定流是可实现的不同出口条件。 该实验还将允许新的观察和测量的环形膜冷凝在6.35毫米内径管0.8米长。 管道以及随后的通道可以从垂直向下到水平配置操作。 本文还提出了用荧光技术测量掺杂介质制冷剂（如FC-72等）的沸腾和冷凝流动中随时间变化的冷凝液膜厚度的方法，从这些测量中可以得到平均和波动结构，并将实验结果与计算模拟和应用（如环形热管等）相联系。

Proposal Number: CTS-0086988Principal Investigator: A. NarainAbstractAchievement of steady or quasi-steady annular or stratified internal condensing flows in pipe (for any given inlet pressure, mass flow rate, and condensing surface temperature distribution) is dependent on compatibility between the condenser-section heat removal rate and exit pressure condition, or, equivalently, exit vapor flow rate fraction. For certain exit conditions, quasi-steady wavy-interface flows are realized and, for other conditions, significant compressibility-induced oscillations will persist. These unresolved issues will be experimentally investigated with the help of electronic flow control techniques which assist in identifying the range of conditions for which quasi-steady flows are achievable for different exit conditions. The experiment will also allow for novel observations and measurements for annular film condensation in 6.35 mm inner diameter pipe of 0.8 m length. The pipe, and subsequently channel, may operate from vertically downward to horizontal configurations. We also propose to measure time-varying condensate film thickness by fluorescence technique applicable to boiling and condensing flows of doped di-electric refrigerants such as FC-72, etc. From these measurements, mean and wave-structure may be found. Separate efforts relate the results of the proposed experimental research to computational simulations and applications such as Looped Heat Pipes, etc.