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

准稳态内部冷凝流的预测和实现能力：综合实验/计算方法

• 批准号: 0086988
• 负责人: Amitabh Narain
• 金额: $ 21.32万
• 依托单位: Michigan Technological University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-05-15 至 2005-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0086988&HistoricalAwards=false
• 关键词: Prediction; Attainment; Capability; Quasi; Steady

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.

提案编号：CTS-0086988主要研究者：A。Narainabstrastarchachievemencement稳定或准稳态或分层的管道内内部凝结流（对于任何给定的入口压力，质量流量和缩合表面温度分布）取决于冷凝物分量的兼容率在冷热率和等效方面均取决于兼容的兼容性。 对于某些出口条件，可以实现准稳态的波浪形界面流，并且对于其他条件，大量可压缩性诱导的振荡将持续存在。这些未解决的问题将在电子流控制技术的帮助下进行实验研究，这有助于确定在不同出口条件下可以实现准稳态流的条件范围。 该实验还将允许在6.35 mm内直径的0.8 m长的6.35 mm内直径管中进行新的观察和测量。 管道以及随后的通道可能从垂直向下运行到水平配置。 我们还建议通过适用于掺杂的Di-Electric制冷剂（例如FC-72）的荧光技术来测量随时间变化的冷凝水膜厚度，例如FC-72等。从这些测量值，平均值和波浪结构中可以找到。 单独的努力将拟议的实验研究的结果与计算模拟和应用，例如循环热管等。