应用多孔转盘的转盘塔进行液膜分离的初步研究

采用带多孔转盘的转盘塔作为液膜分离的连续操作装置,进行了流体力学和传质特性的初步研究。实验表明:开有小孔的转盘塔板具有良好的液液分散性能和传质性能,适用于液膜分离的连续操作。     

应用多孔转盘的转盘塔进行液膜分离的初步研究

采用带多孔转盘的转盘塔作为液膜分离的连续操作装置,进行了流体力学和传质特性的初步研究.实验表明:开有小孔的转盘塔板具有良好的液液分散性能和传质性能,适用于液膜分离的连续操作.     

MASS TRANSFER IN TURBULENT PULSATING FLOWS

The effect of flow oscillation to the mass transfer between turbulent fluid and solid wall was investigatedby measuring the mass transfer rate between fluid and pipe wall with imposed oscillating flow usingelectrochemical method.The velocity and concentration field in the viscous sublayer which controls the mass trans-fer in such a process was simulated by a simple wave model of single harmonics.Experimental results confirmthat the flow oscillation has no influene on time averaged mass transfer rate,but the phase difference betweenphase averaged velocity field and concentration field shifts with the frequency of imposed oscillating flow.Numeri-cal analysis reveals that the concentration boundarylayer which is responsible for the mass transfer is muchthinner than the viscous sublayer which greatly weakens the influence of imposed oscillating flow on mass transfer.     

冷焊技术在齿轮轴上的修复应用

在机械产品使用过程中,常常受一些不可控的意外因素造成零件的局部损伤,出现零件的局部尺寸变小无法满足配合要求、表面拉伤无法满足密封要求等问题,在这种情况下直接报废整个零件会给用户经济造成较大损失。为维护用户利益,本文对冷焊技术在齿轮轴上的修复应用展开了研究,从修复前的准备、修复中的要求、修复后的检查几方面开展。     

A PRELIMINARY STUDY ON LIQUID MEMBRANE SEPARATION IN ROTATING DISK CONTACTORS WITH PERFORATED DISKS

A rotating disk contactor (RDC) with perforated disks was employed for liquid membrane separation. Hydrodynamic characteristics and rate of mass transfer in the contactor were studied. Experimental results indicated that the rotating perforated disks contributed tremendously to liquid-liquid dispersion as well as to the rate of mass transfer. It is claimed, therefore, that contactors equiped with perforated disks is well adaptable to the continuous processing of liquid membrane separations