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Direct contact condensation with and without noncondensable gas in a water pool.

机译：水池中有无不凝性气体的直接接触凝结。

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摘要

Direct contact condensation is widely used in industrial applications due to the required low driving potential and high energy conversion efficiency. It plays an important role in the performance of the suppression pool in the Simplified Boiling Water Reactor. Transport phenomena in the pool start from the initial generation of interfacial structures and gas composition from exhaust devices. In particular for the bubbly regime, the bubble detaching size, gas concentration at the bubble detachment and bubble formation frequency are the boundary conditions for later liquid-gas interactions in the liquid pool. These parameters are coupled together with system operational variables, including system pressure, liquid subcooling, sizes of exhaust devices and gas composition.; The bubble formation experiments with and without the presence of noncondensable gas have been conducted in a subcooled water pool with the variations of the liquid subcooling, noncondensable gas concentration, nozzle size, system pressure and gas mass flow rate. The bubble formation device chosen was an up-standing double-walled nozzle. Nitrogen was used as noncondensable gas. The temperature and pressure of fluids and gas flow rates were measured appropriately. The bubble formation behaviors were recorded by using a high speed video camera and the images were stored digitally.; A bubble formation hydrodynamic equation was obtained from a constant flow bubble formation model to predict bubble detaching sizes with and without phase change. A linear combination of analytical formulas for static and dynamic regimes was found to be appropriate for both regimes and the transition between them. The condensation at the bubble interface was considered as the flow similarity of film condensation at the surface of a solid sphere including effects of gravitational and interfacial shear forces. Thermodynamic simplifications of interfacial variables allow for analysis of coupled heat and mass transfer without knowing the distributions of the temperature and noncondensable gas in detail. The model equations have been expressed explicitly and compared with the present database in terms of heat transfer at the interface, bubble detachment volume, bubble formation frequency and gas composition at the detachment.
机译：由于所需的低驱动电位和高能量转换效率，直接接触冷凝被广泛用于工业应用。它在简化沸水反应堆中抑制池的性能中起着重要作用。池中的运输现象始于界面结构的初始生成和排气装置中的气体成分。特别是对于起泡状态，气泡分离的大小，气泡分离时的气体浓度和气泡形成的频率是后来液池中液-气相互作用的边界条件。这些参数与系统操作变量结合在一起，包括系统压力，液体过冷，排气装置的尺寸和气体成分。在过冷水池中进行了有无不凝性气体存在和不存在的气泡形成实验，其中液体过冷，不凝性气体浓度，喷嘴尺寸，系统压力和气体质量流量都有变化。选择的气泡形成装置是直立的双壁喷嘴。氮气用作不凝气体。适当地测量了流体的温度和压力以及气体流速。使用高速摄像机记录气泡形成行为，并将图像数字存储。从恒流气泡形成模型获得气泡形成流体动力学方程，以预测有无相变时的气泡分离尺寸。发现静态和动态状态的分析公式的线性组合适用于两个状态及其之间的过渡。气泡界面处的冷凝被认为是固体球表面上的薄膜冷凝的流动相似性，包括重力和界面剪切力的影响。界面变量的热力学简化可以分析传热和传质，而无需详细了解温度和不可冷凝气体的分布。模型方程式已明确表示，并在界面传热，气泡分离体积，气泡形成频率和分离时的气体成分方面与本数据库进行了比较。

著录项

  • 作者

    Xu, Yiban.;

  • 作者单位

    Purdue University.;

  • 授予单位 Purdue University.;
  • 学科 Engineering Nuclear.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 181 p.
  • 总页数 181
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 原子能技术;
  • 关键词

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