Effects of molecule number on nucleate boiling in a system

Canonical molecular distribution was introduced to analyze characteristics of nucleate boiling when the liquid molecular number is very small. The minimum bulk phase volume in which phase change was able to occur was determined from the thermodynamic theory of bubble formation in a superheated liquid and from the energy distribution of the molecules in the bulk phase at a given temperature and pressure. The energy level of active molecules nearly independently distributing in systems was determined from conservation of mass. The maximum superheat temperature necessary for boiling nucleation was found to relate to the bulk phase volume with the temperature increasing as the volume decreased. © 2005 Wiley Periodicals, Inc. Heat Trans Asian Res, 34(4): 258–264, 2005; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/htj.20061     

钠沸腾噪声探测研究

文章叙述了钠沸腾噪声探测研究进展,建立了离线和在线均可进行的高频和低频信号采集和处理系统,引进、开展、改进和编制了信号处理、故障诊断、事故报警和自回归模型分析等软件包。应用这些硬软件对水和钠沸腾噪声进行了探测和分析。结果表明,沸腾噪声信号的自功率谱密度(APSD)的幅值明显大于沸腾时的值,用自回归模型判别因子分析,可实现钠沸腾在线实时诊断和监护。     

AN ANALYTICAL MODEL ON VAPOR EXPLOSION OF A HIGH TEMPERATURE MOLTEN METAL DROP IN WATER INDUCED BY A PRESSURE PULSE

An analytical model for small-scale single drop fuel coolant interaction based on fragmentation caused by the Taylor instability and transient heat transfer during collapse and bounce period is developed. According to our previous analysis, pressure in the vapor film blanketing hot surface increases transiently more than 10 MPa, when thickness of the vapor film decreases less than 10 μm. The transient high pressure makes vapor-liquid interface bounce and causes the Taylor instabilities at both sides of the vapor-liquid interfaces by the large acceleration. As the growth time of the interface instability is enough short compared with the bouncing time, the instabilities result to fragmentation and mixing of both liquids. In the proposed model, the fragmentation time and fragmented particle size were estimated from the growth rate and the wave length of the instability. The analytical model composed of a set of time dependent differential equations was numerically calculated by the Runge-Kutta-Gill method. The numerical results were compared with the experimental ones done in Sandia Laboratory.     

沸腾换热的传统理论的质疑

对传统的水的汽化相变理论进行了剖析，论述了饱和水的表面张力的不容忽视和表面张力与饱和水温度的关系。并对汽化核心学说进行了分析，指出了汽化核心学说的一个公式中的不妥之处。以上述各点与同行专家商榷。     

内加热式螺旋流流动沸腾传热研究

本文研究了内加热式螺旋流流动沸腾传热的传热性能与临界热通量问题，提出了有旁流和无旁流时沸腾传热系数的计算方法，并进行了验证。     

12种酵母产油脂量的探讨

本文用索氏煮沸抽提法快速测定了酵母１２个菌株的油脂含量，初步地探讨了不同酵母积累油脂的最佳培养期。     

Safety analysis of beyond design basis accidents in RBMK-1500 reactors

At present the design basis accidents for RBMK-1500 are rather thoroughly investigated. The performed analyses helped to develop and implement a number of safety modifications. Further plant safety enhancement requires developing emergency procedures that would enable beyond design basis accidents management by preventing core damage or mitigating consequences of severe accidents.     

FRACTIONATOR TOOLKIT软测量技术在常减压装置的应用

以初馏塔顶直馏汽油的干点为例介绍了Fractionator Toolkit软件包的基本情况和D86温度计算的基本原理及实施方法。并根据软测量模型的实际应用情况在工艺分析的基础上利用最小二乘法建立校正模型，从而大大提高了软测量模型的准确性和抗干扰能力。为RMPCT的应用创造了条件。