内外单螺带式搅拌器的Metzner常数

对１１种不同向何尺寸的内外单累带搅拌器（ＩＯ－ＨＲ），在６６中不同流动行为指数（ｎ＝０．３７－１）的幂律流体中的剪切特性进行了实验研究。发现内外单螺带 的Ｍｅｔｚｎｅｒ常数，Ｋｓ与流动行为指数ｎ、桨的几何尺寸均相关。提出改进的数据处理方法来求算Ｋｓ，并详细分析了桨的几何尺寸和流体剪切稀化特性对Ｋｓ的影响。最后的对包括经典的Ｍｅｔｚｎｅｒ方法在内的不同求解Ｋｓ的方法做了分析比较。     

螺带式搅拌器的功率消耗

对高粘度牛顿流体和非牛顿流体,在层流域测定了多种几何结构的螺带-锚搅拌器的功率消耗和Metzner常数K_(so)用回归分析方法,分别把Kp(N_p·Re)、K_(?)与搅拌器的几何参数和特性参数进行关联,得到:对底部没有锚的螺带搅拌器,由本实验和文献数据得到:结果还证实了螺带搅拌器的功率消耗与螺带高度不成正比.K_(?)与C_(3)进行关联是一种可行的方法.所得计算式能较准确地预测螺带式搅拌器在搅拌牛顿流体和非牛顿流体时的功率消耗和K_8值.     

高粘度非牛顿流作用搅拌器的混合特性

对高粘度非牛顿流体,在层流域测定了双螺带-锚、内外单螺带-锚、田螺带-锚、交叉斜桨(MIG)-锚、椭圆板-锚、框-螺带-锚和偏框-锚等七种搅拌器的混合时间,研究了它们的混合特性。确认在上述搅拌器中,内外单螺带-锚搅拌器的混合性能最佳,混合时间随流体的流动行为指数n值的降低而增大。     

高粘度非牛顿流体用搅拌器的动力特性

研究了多种搅拌器在高粘度非牛顿流体层流域的动力特性。测定了双螺带-锚、内外单螺带-锚、四螺带-锚、MIG-锚、椭圆板-锚、框-螺带-锚、偏框-锚七种组合型搅拌器和三叶后掠式搅拌器的动率消耗,以及在搅拌槽中关联平均剪切速率的Metzner常数K_S,用K_S值和流动行为指数n值可以把功率消耗关联成:N_PRe~(**)=K_P/K_S(1-n)。     

制备高性能聚丙烯腈基碳纤维纺丝液的双螺带管式反应器

本发明涉及一种双螺带管式反应器，尤其适用于高性能聚丙烯腈基碳纤维纺丝液制备。由机械轴封、轴承座、传动链、变频减速电机、恒温水浴槽、水浴搅拌器、双螺带搅拌器组成，所述的双螺带搅拌器是由一根不锈钢管和安装于管内并与管道长度几乎相等的螺带桨组成。     

顺丁聚合釜搅拌装置的特性研究

对国内顺丁聚合釜的搅拌装置进行了研究,描述了釜内胶液的流动状态,提出了动力特性及混合特性的实验关联式。针对混合过程中存在的问题,提出无中心轴螺带搅拌器,以及减小搅拌器和釜壁之间的间隙,作为聚合釜的改进方向。     

锚式搅拌器功率消耗与Metzner常数研究

对锚式搅拌器在牛顿流体和非牛顿流体中的功耗进行了系统地实验研究。利用Ｒｉｅｇｅｒ 法,发现锚的Ｍｅｔｚｎｅｒ常数Ｋｓ 与流体流动行为指数ｎ 基本无关, 仅与桨的几何尺寸有关。由实验数据和文献数据, 得到锚式搅拌器的功率常数Ｋｐ 和Ｋｓ 与桨的几何尺寸的关联式, 两关联式均具有较高精度和较宽适用范围, 可以满足搅拌器设计的要求。最后分析了不同研究者对Ｋｓ 与ｎ 的关系意见不一和Ｋｓ 值相差较大的原因。     

Numerical simulation of three-dimensional flow field of spiral ribbon-screw impeller

应用计算流体力学数值模拟方法,研究了螺带-螺杆组合式搅拌器对高黏度非牛顿流体的搅拌流场特性。结合实例,考察了宏观流场、速度场、剪切速率和表观黏度的分布,分析了流变指数对搅拌特性的影响,并计算了不同工况下的搅拌功率。结果表明：螺带-螺杆组合搅拌器针对高黏度流体,具有良好的全局搅拌特性,在本文的模拟条件下,组合桨的Metzner常数k_s约为13.8,而流变指数变化对k_s的影响不大,为螺带-螺杆搅拌桨在高黏度非牛顿流体搅拌中的应用提供有益指导和参考。     

组合浆搅拌器搅拌特性的研究

为使聚合釜内搅拌介质在湍流，过渡流及层流域都能达到良好的混合，对锚－三叶推进器，锚－内外单螺带，正交双三角桨－单螺带，正交双层三角桨－内外单螺带等４种组合桨搅拌器，于φ３００ｍｍ的有机玻璃釜中，测定了在牛顿流体和假塑性流体中的搅拌功率和循环特性。实验结果表明，４种组合桨中，含正交双层三角桨的２种组合桨功率消耗小，循环能力明显较强，具有较好的循环性能和剪切能力，能在粘度变化范围宽广的介质中获得良好的     

高粘度假塑性流体搅拌功率的研究

本文研究了适用于高粘度假塑性流体的螺带螺旋组合式新型搅拌器的搅拌功率，并得出了搅拌功率并联式。     

组合桨搅拌器的宏观混合特性

分别以浓度为１％，２％，３％，３．５％的羧甲基纤维素溶液为实验，采用测温法，测定了正交双层三角桨－单螺带桨，正交双层三角桨－内外单螺带桨．锚式桨－三叶推进器．锚式桨－内外单螺带４种组合桨拌器的宏观混合时间，无量钢数Ｃ１，Ｃ２，Ｃ３，Ｃ４综合评判了它们的宏观混合性能，实验证明，前２种组合桨搅拌器在不同流域内都使搅拌介质达到良好的宏观混合，且功率消耗低，混合效率高，具有明显的节能优势，对搅拌变粘度体系     

3D/2D hybrid model for ribbon impellers operating in laminar regime

In the study a 3D/2D hybrid model for ribbon mixers, for a laminar range of mixing was verified. Distributions of the experimental and model values of velocity components and the experimental and model values of mixing power for this type of mixers were compared. Further on, based on the model solutions the optimum parameters of ribbon agitators due to the time of homogenization were established.     

BR生产中首釜桨型选择问题的探讨

根据合成高聚物的桨型选择的基本原则,以首釜液体不属于高粘液体为前提,提出了BR生产中首釜聚合工艺对混合的三要素。通过小试用框式桨和螺带桨的混合状态及混合时间的测定,生产装置操作数据与产品性能的分析,指出首釜由框式桨改为螺带桨是有效的。并提出了开发大尺寸轴向流较之螺带式桨相当或稍逊,而微尺寸混合较强的新桨型的建议。     

A new expression of the Ks factor for helical ribbon agitators

The purpose of this note is to present a new model that is able to predict an effective shear rate in a vessel equipped with helical ribbon agitators, when mixing shear‐thinning fluids. This model is based on well established results obtained for non‐Newtonian flow in cylindrical ducts.     

Mixing in the transition flow regime with helical ribbon agitators

The effects of the non-Newtonian properties on the effective deformation rate, mixing and circulation times and flow behaviour have been investigated in the transition flow regime of mixing systems. Based on the equivalent Couette flow, three models are proposed and are shown to predict similar and drastic increases of the effective deformation rate with the impeller rotational speed in the transition regime. The predictions are shown to fit very well data obtained for various non-Newtonian fluids mixed with helical ribbon agitators, and with literature data for anchor, blade turbine and flat disc agitators. The elasticity along with shear-thinning properties appear to have slight effects on the dimensionless mixing and circulation times in the transition regime, whereas their effects in the laminar regime are quite drastic, as reported by others.     

组合桨聚合釜内非牛顿流体的混合特性

在φ476mm的椭圆底有机玻璃聚合釜中,以羧甲基纤维素-甘油水溶液(前者质量分数为1.3％)为实验物系。利用酸碱中和法测定了9种不同的搅拌桨直径与聚合釜直径比接近于1的组合搅拌桨沿聚合釜轴向及径向的混合特性。结果表明：内外螺带-锚式组合桨的轴向混合最强,但径向混合较差。框板式搅拌桨的轴向混合较内外螺带-锚式组合桨弱,但比改进偏框式桨强,其径向混合较后者弱。改进偏框桨的7种不同组合方式沿径向的混合良好,多数组合桨沿轴向的混合较前2种组合桨弱,更接近于平推流。     

Finite element modeling of the laminar and transition flow of the Superblend dual shaft coaxial mixer on parallel computers

The macro-mixing mechanisms of the Superblend coaxial mixer consisting of a Maxblend impeller and a double helical ribbon agitator mounted on two independent coaxial shafts rotating at different speeds are numerically investigated. The simulations are based on the resolution of the Navier-Stokes equations with help of a parallel three-dimensional finite element solver exploiting the capabilities of high performance computers. To model the rotation of agitators a hybrid approach based on a novel finite element sliding mesh and fictitious domain method is used. The power consumption, the flow patterns, the shear rate distribution, the pumping capacity and the mixing time of the Superblend mixer are calculated from the simulated hydrodynamics. The simulations allow observing the flow as it evolves from deep laminar (Re=0.1) to transition (Re=520) regime. As Reynolds number increases, several recirculation zones above and below the middle of the tank are formed. It is found that operating the agitators in co-rotation mode requires less power consumption and exhibits equal or shorter mixing time than counter-rotation mode. The larger power consumption in counter-rotating mode is caused by the presence of high shear vortices generated between the two coaxial agitators. Furthermore it is shown that the shear distribution throughout the Superblend coaxial mixer operating in co-rotation mode is almost homogenous, which is highly desirable for shear sensitive products. In view of the results obtained in this work, the Superblend coaxial mixer is found as a good alternative for tough mixing applications.     

筒式搅拌器性能试验研究

介绍了获得实用新型专利的筒式搅拌器的结构和工作原理,对筒式搅拌器的搅拌性能进行了试验研究和分析,并与推进式搅拌器和涡轮式搅拌器进行了比较。试验结果表明,3种搅拌器在同等条件下,筒式搅拌器的能耗最小,且其排液量和循环流量最大。     

行星轮式搅拌器及其性能分析

介绍了行星轮式搅拌器的结构特征和工作原理,并且应用fluent软件模拟其流场。对锚式、推进式及行星轮式3种搅拌器的功率准数和相对混合效率数进行了对比分析。结果表明,在相同的工作条件下,行星轮式搅拌器的功率准数与锚式、推进式搅拌器的基本相等,而行星轮式搅拌器的相对搅拌混合效率远大于锚式和推进式搅拌器的。     

筒式搅拌器及其开发

介绍了实用新型专利——筒式搅拌器的结构和设计原理。筒式搅拌器主要有筒体和内弯叶片组成,搅拌时能同时产生强大的径向流和轴向流,具有较大的排液量和循环流量,混合效果极强。筒式搅拌叶轮的各尺寸设计取决于液体性质、混合要求、容器直径和转速等因素。