浅述设备对PCB微孔电镀镀液更新之影响

分析了设备对PCB电镀过程中孔中镀液更新之影响,为有效地利用设备条件改善孔中镀液的更新提供了一些方法及理论数据。     

Characteristics of hydrostatic bearing/seal parts for water hydraulic pumps and motors. Part 1: Experiment and theory

In this paper, the load-carrying capacity, power losses and stiffness of disk-type hydrostatic thrust bearings including the case of eccentric loading are discussed theoretically. The numerical analysis method is established based on a two-dimensional elastohydrostatic problem with an elastic deformation model, which is extended to adapt it for a non-axisymmetric load acting on the thrust bearing. The bearing is made of a combination of stainless steel/stainless steel and stainless steel/plastics. For the elastic materials, the maximum stiffness derived from, i.e., minimum film thickness is, larger than that of the rigid material in the range of a large ratio of pocket pressure and a hydrostatic balance ratio of over unity, which is defined as the ratio of the load to the maximum hydrostatic load-carrying capacity. The maximum load-carrying capacity and minimum power loss can exist in the domain of the hydrostatic balance ratio over unity for the case of the bearing consisting of elastic/rigid materials, in comparison with that composed of the same rigid materials. For the case of water, the power loss due to leakage flow is slightly larger but that due to frictional torque is much smaller than that in the case of hydraulic oil. Then, the total power loss is much smaller than that of hydraulic oil.     

用搅拌式旋转粘度计测水泥生料浆的流变性能

为了消除在粗分散体系中应用圆筒式旋转粘度计所存在的壁效应和沉降效应，尝试将Ｂｒａｂｅｎｄｅｒ型搅拌式旋转粘度计应用于水泥生料浆系统的流变性能测试。对比试验表明：这种方法测定的数据较圆筒式旋转粘度计测定的数据重现性好，更为合理。     

超高摩尔质量聚乙烯内衬复合管应用前景展望

通过对超高摩尔质量聚乙烯内衬复合管的技术特点及国内外现场试验效果的阐述；证明了超高摩尔质量聚乙烯内衬复合管自身的各种物理特性。对延长旧管使用寿命,减少杆管偏磨,延长油井清蜡周期具有良好的效果。     

两个同心施转圆柱间的Taylor问题

本文推导了在修正双极坐标系下的Ｎａｖｉｅｒ－Ｓｔｏｋｅｓ方程和讨论了它的基本流的扰动解     

非牛顿流体在气液搅拌槽内强制流动传热特征研究

为了确定非牛顿流体气流搅拌流动传热特征，对气体有效分散区域（载点）提出了无因次准数关联式，并就两种不同叶轮搅拌的通气管外传热系数作了比较。     

高转速、无稳心搅拌装置介绍

本文介绍了一种特殊的高转速、无稳心搅拌系统，具备简洁、高效、稳定、安全的特点，经使用证明，效果良好，性能可靠，为高速搅拌及无稳心反应釜的应用提供了一条新的设计及运用的途径。     

A STUDY OF SILICONE OIL-IN-WATER EMULSIONS

Emulsions of silicone oil-in water were formed using a Brinkmann Polytron homogenizer with Igepal CO-530 as an emulsifier. Silicone viscosities ranged from 10 to 33,000 mPa.s at 25°C. Rheological characteristics and particle size analyses of silicone oil-in-water emulsions were studied. At high volume fraction of the dispersed phase (70%-75%), silicone oil-in-water emulsions were stable. At lower volume fractions (50%-60%), emulsions formed were less stable and the two phases easily separated in a few days. The emulsions formed with high volume fraction silicone oil show highly non-Newtonian behavior (shear thinning). Emulsions made with low viscosity oils had lower viscosities than those made from high viscosity oils. Relative viscosity-concentration data could be correlated by the Frankel and Acrivos Equation. Increasing the emulsifier concentration of 70% oil-in-water emulsions resulted in a decrease in mean droplet size and an increase in emulsion viscosity. Increasing the intensity of agitation also resulted in higher viscosity and smaller droplet size until a critical energy input above which droplet size increased. Emulsification with low shear mixing provides more control in decreasing mean droplet size with time.     

涡轮桨变速搅拌槽内湍流混合的实验研究

以NaCl颗粒在水中的溶解为例,对湍流状态下周期性变速旋转的（改变桨叶转向或速度大小,分别称为周期性换向搅拌和周期性依时搅拌）Rushton桨搅拌槽内的混合特性进行了实验研究,并与稳速搅拌进行了对比。实验过程中测量了不同搅拌模式、不同桨叶安装高度时颗粒的溶解时间,结果证明,搅拌槽底部的流型对NaCl的溶解有重要影响;桨叶安装高度对溶解速度的影响不大,周期性依时搅拌时的溶解时间比稳速搅拌时稍短,而周期性换向搅拌则能明显加快溶解速度,提高混合效率。     

Investigation of Flow Patterns in Continuous‐flow Stirred Vessels by Laser Doppler Velocimetry

The flow structure of a continuous‐flow reactor stirred by a Rushton turbine was investigated by laser Doppler velocimetry for two different mean residence time‐mixing time ratios. Velocity measurements were obtained for two inlet locations, corresponding to the incoming liquid stream being fed co‐currently or counter‐currently to the flow discharged by the turbine. In all investigated configurations and for all operating conditions, it was found that the flow disruption caused by the incoming liquid stream was observable mainly in the first vessel quarter, which followed the feed‐tube plane. From comparison of the velocities encountered in the various planes in the continuous‐flow reactor to the velocities of the batch reactor, it was also concluded that it may be possible to intensify the usage of the turbine‐stirred vessel by decreasing the characteristic times ratio, without considerable flow by‐pass and/or short‐circuiting problems.