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dc.contributor.author沙勇zh_CN
dc.contributor.author李樟云zh_CN
dc.contributor.author林芬芬zh_CN
dc.contributor.author吐松zh_CN
dc.contributor.author肖宗源zh_CN
dc.contributor.author叶李艺zh_CN
dc.date.accessioned2011-04-26T08:05:56Z
dc.date.available2011-04-26T08:05:56Z
dc.date.issued2010-04zh_CN
dc.identifier.citation化工学报,2010,61(4):844-847zh_CN
dc.identifier.issn0438-1157zh_CN
dc.identifier.urihttps://dspace.xmu.edu.cn/handle/2288/3754
dc.description联系人及第一作者: 沙勇( 1971- ) , 男, 博士, 副教授。zh_CN
dc.description.abstract[中文文摘]引言在相际质量传递过程中,界面处液体物化性质由于物质传递发生改变,如产生密度梯度和界面张力梯度,使界面流体发生流动的现象即为界面湍动。通常由界面处流体密度梯度引发的界面湍动称为Rayleigh-Bénard对流,而由界面表面张力梯度引发的界面湍动,称为Marangoni对流[1]。由于传质过程中发生的界面湍动在临近界面处发生,其浓度场和速度场难以测量,目前多利用纹影法、投影法、干涉法等光学测试手段,对其湍动形态进行观察,为了解界面湍动提供直接视觉证据。利用蒸发、吸收、解吸、萃取等传质手段,不同的研究者对界面湍动进行了直接光学观察,考察了不同传质条件下的界面湍动结构,获取的形态众多,结构复杂[2-7]。对于气-液界面传质导致的界面湍动,其光学观察多集中在研究界面平面内出现的细胞形、六边形、滚筒形等规则或不规则形态,通常为湍动充分发展后的形态,尺度偏大[6-9],而对于实际应用中更重要的界面湍动向主体相渗透的时空观察,十分匮乏,尚需大量设计精巧的实验以揭示其内在的规律。传质过程中产生的界面湍动为强非线性传质流动耦合现象,是非线性理论良好的研究对象[10],并且界面湍动促进了流体表面更新,可对宏观传质设备传质产生显著影响[11],对其的深入研究有着理论和实际上的需要。 本文利用放大界面区域的投影法, 观察有机溶剂水溶液挥发过程中,由界面向液相主体渗透的界面湍动结构, 获取直接视觉资料。 [英文文摘]In gas-liquid mass transfer processes,interfacial turbulence may occur due to the surface tension gradient and the density gradient produced by mass transfer near the interface.The interfacial turbulence can enhance the mass transfer since it intensifies the movement of interfacial fluid.By means of the shadowgraph optical method,the interfacial turbulence patterns vertical to the interface were observed directly in the volatilization process of binary systems.The images of the amplified interfacial turbule showed the variation of concent ration and the fluid movement under the interface. Two patterns of interfacial turbulence were observed in the experiments: plume and vortex.With the plume, the interfacial fluid moved slowly and penet rated the liquid deeply.With the vortex, the inter facial turbulence occur red in the vicinity of the liquid interface and the fluid moves quite fast. A qualitative analysis was carried out based on the mechanism of Rayleigh-Bénard convection induced by density gradient and Marangoni convection induced by surface tension gradient.zh_CN
dc.description.sponsorship国家自然科学基金项目( 20606027) 。zh_CN
dc.language.isozhzh_CN
dc.publisher《化工学报》编辑部zh_CN
dc.subject投影zh_CN
dc.subject界面湍动zh_CN
dc.subject传质zh_CN
dc.subjectMarangoni对流zh_CN
dc.subjectRayleigh-Bénard对流zh_CN
dc.subjectshadowgraphzh_CN
dc.subjectinterfacial turbulencezh_CN
dc.subjectmass transferzh_CN
dc.subjectMarangoni convectionzh_CN
dc.subjectRayleigh-Bénard convectionzh_CN
dc.title气液传质界面湍动现象投影观察zh_CN
dc.title.alternativeShadowg raph observat ion on interfacial turbulence phenomena in gas-liquid mass transferzh_CN
dc.typeArticlezh_CN


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