非牛顿流体中的气泡行为

非牛顿流体广泛存在于各学科领域（如化工、食品和生物医学等）,也与许多工业过程及人类的生命过程密切相关。非牛顿流体中的气泡行为直接影响流体传质、传热及化学过程的快慢。因此,了解和研究非牛顿流体中的气泡行为具有重要意义。本文分别从气泡生成、聚并和破裂3个方面对非牛顿流体中气泡行为的研究进展进行评述。     

非牛顿流体中的单气泡行为研究

本文通过实验研究了非牛顿流体ＣＭＣ水溶液－Ａｉｒ中的单气泡行为，并重点考察了操作条件，液体性质，通过型式等因素的影响，结果表明：操作条件、液体性质对气泡的形态、小及其运动均有直接影响，通过型式对气泡形态的影响并不明显；体非牛顿性的增强，气泡间的聚并加剧。     

非牛顿流体中双喷嘴连续气泡的生成与聚并

采用VOF-CSF法模拟研究了幂律型非牛顿流体中双喷嘴气泡的生成及聚并行为,得到稳定状态下3种不同的气泡流型:1两喷嘴处的气泡在生成过程中发生聚并;2两喷嘴处的气泡交替生成并发生在线聚并;3两喷嘴处的气泡几乎同时生成,在上升过程中由相互吸引变为相互排斥,无聚并现象发生。第1、2种流型中,先前生成气泡的尾流会对正在生成的气泡产生显著影响,使气泡倾向液体流动的方向生成;第3种流型中,气泡间因涡流重叠面积的不同和液相惯性力作用,在上升过程中由开始的相互吸引逐渐变为相互排斥。     

静止非牛顿流体中气泡生成过程的传质

气泡生成过程中气液传质是气液接触设备的设计、优化的重要参考指标。以二氧化碳气泡在羧甲基纤维素钠(carboxymethyl cellulose,CMC)溶液中生成过程中的传质为研究对象,分别考察了气速、CMC溶液浓度、针头直径对气泡生成过程气液传质的影响,采用具有CCD显微相机的动态接触角分析仪测量了气泡形状、表面积和体积的变化,进而获得气泡生成过程气液传质系数k_l。实验结果表明,CMC浓度从0.2%增加到0.8%,黏度逐渐增大,传质系数随CMC浓度的增大而增大;针头直径从2.5 mm增加到4 mm,传质系数也随之增大;气速从1 ml·min^-1增加到9 ml·min^-1,传质系数也逐渐增大。     

拟塑性非牛顿流体中在线气泡聚并规律

以拟塑性羧甲基纤维素钠(CMC)水溶液作为非牛顿流体,对在线上升气泡的聚并规律进行了研究。利用光电信号采集系统测定了不同高度的气泡聚并分布规律,分析了气体速度及流体性质等因素对聚并规律的影响。结果表明,在测量高度和实验气速范围内,随着高度升高,在高气速下,气泡聚并率减小,在低气速下,则先增大后减小。2种情况下,达到一定高度后均趋于恒定;在一定高度下,达到一定气速后,气泡聚并率变化较小;中低气速下,聚并率随CMC质量分数增大而减小,而在高气速下,CMC质量分数变化对聚并率影响较小。     

非牛顿流体中气泡群传质的研究

CO2气泡群在液相中的传质在化工过程中广泛存在.对CO2气泡群在3种不同流体(牛顿流体、非弹性剪切变稀流体和黏弹性剪切变稀流体)中的气液传质过程进行了研究.利用CO2探针测定了不同操作条件下CO2的体积传质系数,考察了液相浓度,气体流量以及流变性质对体积传质系数的影响.结果表明:在3种流体中,体积传质系数均随气体流量的...     

非牛顿流体减速带的应用研究

减速带意在提醒司机减速,但在通过减速带时会感到有强烈的震感。而非牛顿流体减速带可以使车辆在低速过该减速带时如履平地,不会产生不适感。非牛顿流体减速带利用非牛顿流体的粘度随剪切应力和剪切速率增大而增大的性质。通过建立非牛顿流体减速带的模型,设置临界速度V_K。对于水泥生料浆作为填充物,车速小于临界速度V_K(33.5m/s),减速带仅产生形变,而以大于临界速度通过减速带时,减速带变成刚体,表现出与常规减速带相同的效果。本模型使得定制特征减速带成为可能,推进了非牛顿流体减速带的应用。     

牛顿及非牛顿流体中的气泡生成与对比

采用激光成像结合CCD摄像技术分别对牛顿及非牛顿流体(甘油和羧甲基纤维素钠水溶液)中的气泡生成行为进行了研究,对2种流体气泡生成过程中气泡形状和体积变化进行了比较。分析了非牛顿流体的弹性效应对气泡生成过程气泡形状的影响。实验结果表明,在实验条件范围内,甘油中,气泡生长初期,气泡体积增加较快,到了后期,增加幅度减缓,气速对气泡生长过程气泡体积影响很小;羧甲基纤维素钠(CMC)水溶液中,气泡生长初期,气泡缓慢生长,气速对气泡体积影响很小,到了后期,气泡体积增加幅度变大,气泡体积随着气速的增大而增大。     

激光成像技术在气泡生成行为研究中的应用

针对液相中单喷嘴的气泡生成过程,采用激光成像技术结合电荷耦合器件(Charge Coupling Device, CCD)摄像机照相方法研究了甘油水溶液中的气泡生成行为,结果表明该法能够获得清晰的二维气泡放大图像. 考察了溶液浓度、气室体积、喷嘴直径和气体流量对气泡分离体积的影响,发现气泡分离体积分别随着溶液浓度和气室体积的增大而增大;在所研究的喷嘴直径(1, 1.5和2 mm)范围内,气泡分离体积随着喷嘴直径的增大而减小;气体流量对气泡分离体积的影响与喷嘴直径有关,当喷嘴直径为1和1.5 mm时,气泡分离体积随着气体流量的升高而增大,但当喷嘴直径为2 mm时,气泡分离体积随着气体流量的升高先减小后增大.     

熔块中气泡的形成与排出

针对熔块中的气泡缺陷，论述了熔块熔体中泡核的形成及长大、常见气体的溶解及扩散、气泡的上升及排出，以及对它们的影响因素。     

Bubble drag in contaminated non-newtonian solutions

The motion of a bubble in an infinite fluid is examined in the case where the surrounding fluid is non-Newtonian and contains impurities. An expression is developed for the drag force as a function of the shear-thinning character as well as of the concentration of surfactant of the fluid. The obtained expression for the drag force correlates quite nicely with experimental data for small bubbles.     

Experimental Investigations of Regimes of Bubble Formation on Submerged Orifices Under Constant Flow Condition

Regimes of bubble formation on a submerged orifice under constant flow conditions were investigated experimentally. The effects of orifice diameter, surface characteristics (contact angle and roughness) and surface tension on the regimes of bubble formation were studied for a wide range of gas flow rates. In particular, the transitions of period‐1 to period‐2 bubbling regime, with pairing or with coalescence at the orifice, and period‐2 to chaotic bubbling were investigated in detail. An attempt is made to provide a generalized bubble formation regime map constructed using appropriate dimensionless numbers. The physical understanding of various bubbling regimes and the experimental data on the effects of various system parameters are expected to contribute to the development and validation of analytical and CFD models     

Bubble formation in cocurrently upward flowing liquid

The effects of liquid velocity, nozzle diameter, gas chamber volume and gas flow rate on volumes, shapes and growth curves of bubbles formed at a nozzle submerged in a cocurrently upward flowing liquid in a bubble column were experimentally investigated. The bubble volume decreases with increasing liquid flow velocity. The effect of liquid flow velocity on the volume of bubble increases with an increase in the gas flow rate. To simulate bubble formation at a nozzle submerged in cocurrently upward flowing liquid, a revised non-spherical bubble formation model was proposed. Bubble volumes, bubble growth curves and shapes experimentally obtained in this study, as well as in previous experimental studies, are well predicted by the present model.     

ILAR中醇及电解质对非牛顿流体中气-液传质的影响

在-气升式内环流反应器中试验考察了非牛顿流体羧甲基纤维素钠(CMC)中的气泡聚并现象以及表面活性物质对液相体积传质系数的影响。结果表明,非牛顿流体中气-液传质效率随黏度的增加而降低,其原因是黏度增加使Taylor泡的尾流趋于稳定,降低了液相扰动,气泡间易聚并,从而气-液传质效率低。向非牛顿流体中添加醇类物质会影响气-液传质行为,对于聚合物含量低的流体,添加微量醇可以促进气-液传质,聚合物含量高的非牛顿流体,微量醇的加入反而不利于气-液间传质过程。非牛顿流体在ILAR上升管中的气含率随着黏度的增加变化不大,而下降管中的气含率有所提高。     

Bubble Formation at a Rotating Cylindrical Surface in Cross‐Flowing Liquid

A novel method of gas sparging from a rotating cylinder is proposed, which prevents against formation of large attached gas cavities in cross‐flowing liquids including those flowing downwards. Experimental and theoretical results regarding critical rotation speed necessary to remove the attached cavity, bubble formation process and size distribution of the produced bubbles in a low viscosity system (air‐water) are presented in this study.