Coaxial liquid-liquid flows in tubes with limited length

Coaxial liquid-liquid flows were numerically studied in a nesting two-tube system. Calculations were carried out when various exit-lengths （meaning length differences between the two tubes） were used. Numerical results indicated that there exists a certain range of exit-length for the liquid-liquid flows to form stable and smooth interfaces, which requires that the exit-length should roughly be less than 5.6 times the outer tube diameter. In this range, interface instability is effectively restrained and the core fluid shows a phenomenon of die swell. When the exit-length is about 1.6 times the outer tube diameter, the core fluid has the greatest diameter size in the shell fluid. Velocity distributions at the outer tube exit favor formation of a continuous and stable core-shell structure.     

从设计一个实验看学生能力的培养

以调压室涌浪为例，介绍学生由过去的操作性实验到设计性实验的转变，达到使学生增强对实验的兴趣、创新能力及分析问题和解决问题能力提高的目的。     

海上游泳动作影响因素及对策分析简

海风、潮汐、涌浪以及受训者“恐海”心理,都是影响海上游泳训练的重要因素.在训练中,只有克服负面因素保证游泳训练的安全,才能进一步提高游泳训练质量.     

中国海海表风场、风浪、涌浪、混合浪场时空分布特征研究

利用来自ECMWF的ERA-40海浪再分析资料,采用EOF、线性回归、功率谱分析等方法,对中国海的海表风场、风浪、涌浪、混合浪的变化趋势的及周期进行研究,为海洋水文保障、海洋工程等提供参考。