| Effect of Ultrafine Particles on Flow Field and Transport Properties near the Interface Around a Moving Bubble |
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| 作者姓名： | 马友光 徐世昌 冯惠生 余国琮 |
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| 作者单位： | StateKeyLaboratoryofChemicalEngineering,SchoolofChemicalEngineeringandTechnology,TianjinUniversity,Tianjin300072,China |
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| 基金项目： | SupportedbyNationalNaturalScienceFoundationofChina(No.2 0 1 760 36) |
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| 摘 要： | Laser Doppler Anemometer has been used to measure the flow field characteristics near the interface around a moving bubble in the presence of ultrafine particles. In order to model a moving bubble, the bubble was fixed into the counter-flow liquid by a metal mesh. Experimental materials are air and water, and the particles are complex oxidate powder. Experiments were carried out under the operating conditions: the liquid flow velocity u0 is 12.6cm/s, the equivalent diameter de is 0.6cm, the mass concentration of particle is 0.2%,the average particle diameter is about 10nm and the density is 2g/cm^3. The velocity profiles of beth frontal and tail-vortex areas were measured respectively. The experimental results show that the velocity fields are obviously changed in the existence of particles. In the frontal area of the bubble, beth tangential and normal velocities decrease due to the presence of particles, but in tail vortex area, the tangential velocities increase remarkably,and normal velocities rise gradually from the center towards the fringe in the opposite tendency to that of no partitles. The influences of flow field change in the presence of particles on gas-liquid mass transfer are analyzed and discussed.
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| 关 键 词： | 流场 传输性质 激光Doppler风速计 细微粒子 速度分布 移动泡沫 |
Effect of Ultrafine Particles on Flow Field and Transport Properties near the Interface Around a Moving Bubble |
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| MA You guang,XU Shi chang,FENG Hui sheng,YU K T.Effect of Ultrafine Particles on Flow Field and Transport Properties near the Interface Around a Moving Bubble[J].Transactions of Tianjin University,2004,10(1):1-4. |
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| Authors: | MA You guang XU Shi chang FENG Hui sheng YU K T |
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| Abstract: | |
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| Keywords: | Laser Doppler Anemometer ultrafine particle moving bubble flow field velocity distribution |
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