环空套管内粘弹性流的解析解

本文讨论了二阶流体和 Maxwell流体在环形套管内的轴向不定常旋转运动 ,给出了与文 [1 ]不同形式的解析解 ,修正了该文的结果 .     

Gas—liquid annular flow under microgravity conditions: a temporal linear stability study

A temporal linear stability study was performed for a gas—liquid annular flow configuration under microgravity conditions. Data used to validate the modeling includes that generated by Texas A&M as well as all the other known data in two-phase flow under reduced gravity conditions. Following a discussion of theoretical considerations on the growth rates of different instabilities, it is shown that given the fluid properties, pipe diameter and phasic flow rates, one can predict with a high level of confidence the flow regime in the pipe. Acceptable confidence levels (80%) are achieved when one differentiates between slug, slug—annular, and annular flow. Higher confidence levels (90%) are found when one differentiates between slug and annular flow by merging the annular and slug—annular categories.     

双参数地基上圆（环）板轴对称稳态振动的解析解

本文应用贝塞尔函数理论，根据不同的ω值获得了双参数地基上圆（环）板轴对称稳态振动的解析解。最后，给出了一些计算结果。     

热疗用环形平面换能器声场特性的研究

引入负声源，导出了环形平面换能器声场的简洁表示式，计算了单个圆环、多个同心圆环同时激励及环阵相控聚焦声源产生的声场，分析了环的宽度、环数及聚焦点位置等因素对声场特征的影响。提出根据各阵元在声场中某点产生的声压的相位来确定各阵元电激励信号的延时，此方法较根据各阵元到该点的平均声程确定各阵元电激励信号的延时，能更难确地在该点实现聚焦。     

环形管环状流临界热负荷解析模型

根据环形管内流动与传热的特点,重新定义了环形管的水力直径和热周直径,基于圆管环状流CHF解析模型,得到了环形管内环状流临界热负荷解析模型。该模型可以预测环形管内沸腾两相流环状流时在不同加热方式下发生的临界热负荷,加热方式包括有内侧加热、外侧加热、两侧同时加热等。数值预测结果与文献数据比较表明本文的解析模型在P=0.57-15.01.MPa,G=198-3789.5 kgm-2s-1,xc=0.068-0.855,L/Dhe=19.3-539.5范围内预测良好。     

配置环形线电极的单极机中的磁流体力学流动

给出配置了环形线电极的单极机中的磁流体力学解析解. 由于问题是线性的, 求解可简化为基本解的叠加, 可利用单极机在两个区域中的基本解的衔接来求得解析解. 讨论了基本解的性质. 利用非完全电极可改善Hartmann 边界层、增加装置中的质量流量. 应用基本解讨论了连续电极的单极机.     

The solution of a wedge disclination dipole interacting with an annular inclusion and the force acting on the disclination dipole

The interaction between a wedge disclination dipole and an elastic annular inclusion is investigated. Utilizing the Muskhelishvili complex variable method, the explicit series form solutions of the complex potentials in the matrix and the inclusion region are derived. The image force acting on the disclination dipole centre is also calculated. The influence of the location of the disclination dipole and the thickness of the annular inclusion as well as the elastic dissimilarity of materials upon the equilibrium position of the disclination dipole is discussed in detail. The results show that a stable equilibrium point of the disclination dipole near the inclusion is found for certain combinations of material constant. Moreover, the force on the disclination dipole is strongly affected by the position of the disclination dipole and the thickness of annular inclusion. The repulsion force increases （or the attraction force reduces） with the increase of the thickness of the annular inclusion. An appropriate critical value of the thickness of the annular inclusion may be found to change the direction of the force on the disclination dipole. The present solutions include previous results as special eases.     

Bulk interfaces in a Ni-rich Ni-Au alloy investigated by high-resolution Z-contrast imaging

Interfaces between Au-rich precipitates and the Ni-rich matrix in a decomposed Ni-10 at.% Au alloy were investigated by low-magnification and high-resolution Z-contrast imaging. During aging at 923 K, the originally single crystalline sample decomposed and recrystallized resulting in a microstructure consisting of subgrains separated by small-angle grain boundaries. These small-angle grain boundaries are decorated by Au-rich precipitates. The interfaces between the Au-rich precipitates and the Ni-rich matrix were characterized with respect to the orientation relationship between precipitates and matrix, misfit dislocations and concentration gradients. Two transformation modes were identified that are involved in the decomposition of bulk Ni-rich Ni–Au alloys. While in the first mode the interface is semi-coherent, in the second mode the interface corresponds to an incoherent twin boundary. It is further shown that strain fields around misfit dislocations can result in systematic errors in the determination of the concentration gradients across interfaces between precipitates and matrix.     

Influence of a vortex gas flow on an axial laser beam

An experimental investigation of the optical properties of a bilateral straight-through-flow small-scale (1.7410^–2 m) vortex tube has been carried out experimentally, and the influence of this tube on an axial small-section (310^–3 m) laser beam has been studied. Additional data confirming the reliability of the gas-dynamical model of formation of laser beams with an intensity dip at the center are obtained.__________Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 72, No. 1, pp. 58–62, January–February, 2005.     

Separated flow modelling and interfacial transport phenomena

A physical explanation of the different types of interfacial waves that appear in stratified and annular gas-liquid flows is presented. The role of waves in affecting process performance is discussed. Particular attention is paid to interfacial drag, gas absorption, the initiation of slug flow and atomization.This paper was presented at the Shell Conference on Computational Fluid Dynamics in Apeldoorn, December, 1989.