Flow resistance characteristics of water in narrow annulus during heat exchange

Considering the special resistance characteristics of fluids flowing through ducts with small gaps, experiments are per-formed to investigate the resistance characteristics of single-phase water, which is forced to flow through vertical annuli. The gap sizes are 0.9, 1,4 and 2.4ram, respectively. The experiments are conducted under condition of 1 atm. The water in the annuli is heated by high temperature water reversely flowing through the inner tube and the outer annulus. The results show that the flow pattern begin to change from laminar to turbulent before Reynolds number approaches 2000, the flow resistance in annulus has llttie relations with the temperature difference and ways of being heated, but mainly depends on the ratio of mass flux to the width of annulus.     

重型液罐车罐体防冲击板的设计

在重型液罐车中，为了防止液体冲击的破坏，需要考虑在罐体中间安装隔板。提出了隔板的厚度与间距的关系公式，并在工程设计中进行了应用。     

液体密度测量的动态补偿

介绍了应变计式液体密度的传感器的工作原理，和这种传感器在摇摆动态条件下的误差产生原因以及减小这种误差的补偿方法，并以实测数据证明效果是明显的。     

自由液面对船舶稳性影响的计算

此文从实用角度论述了各种条件下可能出现的自由液面及其对船舶稳性影响的计算方法，给出了具体的计算公式，并提出了在航海实践中减小和控制自由液面对船舶稳性影响的具体措施。     

不来梅、不来梅港2003年集装箱吞吐量增长6％

世界第一大港新加坡从1995年以来货物吞吐量一直在3亿吨以上，2002年更是创下3．35亿吨的纪录。     

Numerical Simulation of Liquid Sloshing——a Review

Liqui dsloshing is associated with various engineering problems．Many studies have been performed since 1950s．A comprehensive review on the study and advance of numerical simulation of liquid sloshing．with emphasis on free surface tracking techniques，has been presented in this paper．At present．several methods can be used to simulate liquid sloshing numerically．However，each method has its own advantages and disadvantages and it should be applied according tO characteristics of practical engineering problems．In the future．further work should be placed on developing more effective techniques for treating very large amplitude sloshing problems，namely，for simulating overturning，breaking and merging of free surface，for predicting transient impact loads pressure of sloshing．     

散装水泥罐车料盖的自动焊接设备及工艺

针对散装水泥罐车料盖的结构特点,介绍了料盖专用自动焊接设备及相关的焊接工艺.     

集装箱液体货物运输的实施与发展

介绍了国外非危液体货物集装箱运输方式的应用及我国集装箱液体运输运营试验的情况，分析了我国非危液体物流流向和铁路集装箱箱流的不平衡所产生的运能损失以及货主对集装箱液体运输方式的需求，阐述了在我国开展集装箱液体运输的必要性和可行性。