基于CFD数值模拟的新型撞击流反应器内管内径的优化
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摘要
基于CFD数值模拟技术,对新型撞击流反应器内管内径进行了优化。该反应器由同轴的内外管构成,其中外管固定于机架,内管由锥齿轮带动做旋转运动,内管管壁均匀开设多排微孔,同轴的内外管之间构成环形微反应区。内管内径尺寸直接影响着反应器内部的压力和湍动能的分布,从而决定了微反应区内两种反应液的混合程度,因此它是反应器的一个重要设计参数。本工作系统研究了不同内管内径对环形微反应区内流场结构的影响,结果表明:内管内径为2mm时,在各排微孔处产生的撞击束均获得了较高的能量,微孔喷射速度大,且其喷射速度和湍动能自上而下逐渐增加,反应液在停留时间较短的反应器的底部,具有更好的撞击效果,有利于反应液的充分混合与反应。
In this paper,the inner pipe diameter of the new-style impinging stream reactor was optimized by CFD numerical simulation technology.The reactor was consists of the coaxial inside tube and outside tube,in which,the outer tube is fixed on the rack,and the rotation of the inside tube is driven by bevel gear.The multiple-rows microporous are uniformly opened on the inside tube wall,and looping micro-reaction zone was formed among the coaxial inside and outside tube.The size of the inner pipe diameter directly affect the pressureand turbulent kinetic energy distribution of the reaction liquid in looping micro-reaction zone,and then determine the mixed degree of two kinds of reaction liquid.So the size of the inner pipe diameter is important parameter in design of the reactor.In this paper,the influence of the difference size tube diameter on the flow field structure in the reactor is studied.The results show that high turbulent kinetic energy and the jet velocity were obtained at each microporous,when the inside tube diameter is 2 mm.The jet velocity and turbulent kinetic energy increase gradually from top to bottom,leading to the reaction liquid with short residence time in reaction zone of the reactor bottom has batter impact effect.It is more beneficial to the mixing and reaction of the reaction liquid.
In this paper,the inner pipe diameter of the new-style impinging stream reactor was optimized by CFD numerical simulation technology.The reactor was consists of the coaxial inside tube and outside tube,in which,the outer tube is fixed on the rack,and the rotation of the inside tube is driven by bevel gear.The multiple-rows microporous are uniformly opened on the inside tube wall,and looping micro-reaction zone was formed among the coaxial inside and outside tube.The size of the inner pipe diameter directly affect the pressureand turbulent kinetic energy distribution of the reaction liquid in looping micro-reaction zone,and then determine the mixed degree of two kinds of reaction liquid.So the size of the inner pipe diameter is important parameter in design of the reactor.In this paper,the influence of the difference size tube diameter on the flow field structure in the reactor is studied.The results show that high turbulent kinetic energy and the jet velocity were obtained at each microporous,when the inside tube diameter is 2 mm.The jet velocity and turbulent kinetic energy increase gradually from top to bottom,leading to the reaction liquid with short residence time in reaction zone of the reactor bottom has batter impact effect.It is more beneficial to the mixing and reaction of the reaction liquid.
引文
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[12]杨侠,刘丰良,毛志慧,等.立式撞击流反应器不同撞击间距下混合性能分析[J].化工进展,2012,31(6):1210-1214.YANG Xia,LIU Fengliang,MAO Zhihui,et al.Mixing performance of a vertical circulative impinging stream reactor with different spacing[J].Chemical Industry and Engineering Progress,2012,31(6):1210-1214.
[13]陈平,李俊玲,邵天敏,等.考虑表面张力影响的表面织构最优参数分析[J].机械工程学报,2016(19):123-131.CHEN Ping,LI Junling,SHAO Tianmin,et al.Optimal analysis of geometric parameters of surface texture with surface tension considered[J].Journal of Mechanical Engineering,2016(19):123-131.
[2]CHOW S F,SUN CC,CHOW A.Assessment of the relative performance of a confined impinging jets mixer and a multi-inlet vorte mixer for curcumin nanoparticle production[J].European Journal of Pharmaceutics and Biopharmaceutics,2014,88:462-471.
[3]杨侠,余蓓,郭钊,等.多喷嘴对置式撞击流反应器流场的数值模拟[J].化工进展.2013(7):1480-1483.YANG Xia,YU Bei,GUO Zhao,et al.Numerical simulation of the flow field in multi-nozzle opposed imping stream reactor[J].Chemical Industry and Engineering Progress,2013(7):1480-1483.
[4]LIU X,CHEN Y,CHEN Y.Analysis of gas-particle flow characteristics in impinging streams[J].Chemical Engineering and Processing,2014,79:14-22.
[5]陈平,李俊玲,邵天敏,等.考虑表面张力影响的表面织构最优参数分析[J].机械工程学报,2016(19):123-131.CHEN Ping,LI Junling,SHAO Tianmin,et al.Optimal analysis of geometric parameters of surface texture with surface tension considered[J].Journal of Mechanical Engineering,2016(19):123-131.
[6]GUAN T,ZHANG J,SHAN Y.Convective heat transfer by a row of tab excited impinging jets on a wedge-shaped concave surface[J].International Journal of Thermal Sciences,2016,100:37-53.
[7]LIU Z,GUO L,HUANG T,et al.Experimental and CFD studies on the intensified micro mixing performance of micro-impinging stream reactors built from commercial T-junctions[J].Chemical Engineering Science,2014,119:124-133.
[8]LUKAS M,MATTHIAS K.On the transient flow characteristics in confined impinging jet mixers-CFD simulation and experimental validation[J].Chemical Engineering Science,2015,133:91-105.
[9]罗燕,周剑秋,郭钊,等.液体连续相撞击流反应器中结构与操作参数对混合性能的影响[J].南京工业大学学报(自然科学版),2016,38(3):15-17.LUO Yan,ZHOU Jianqiu,GUO Zhao,et al.Effects of structure and operation parameters on mixing performance[J].Journal of Nanjing tech university(Natural Science Edition),2016,38(3):15-17.
[10]李光霁,潘家祯.基于Fluent的超高压撞击流乳化喷嘴的优化分析[J].力学季刊,2008(12):635-641.LI Guangji,PAN Jiazhen.Optimized analysis for impinging streams emulsification nozzle under hyper high pressure on software fluent[J].Chinese quarterly of mechanics,2008(12):635-641.
[11]李镇江,孙坤岩,孟阿兰,等.一种同轴撞击流反应器及连续制备纳米材料的方法:中国201610981683.2[P].2016-11-09.LI Zhenjiang,SUN Kunyan,MENG Alan,et al.A coaxial impinging stream reactor and continuous preparation methods of nanomaterials:CN 201610981683.2[P].2016-11-09.
[12]杨侠,刘丰良,毛志慧,等.立式撞击流反应器不同撞击间距下混合性能分析[J].化工进展,2012,31(6):1210-1214.YANG Xia,LIU Fengliang,MAO Zhihui,et al.Mixing performance of a vertical circulative impinging stream reactor with different spacing[J].Chemical Industry and Engineering Progress,2012,31(6):1210-1214.
[13]陈平,李俊玲,邵天敏,等.考虑表面张力影响的表面织构最优参数分析[J].机械工程学报,2016(19):123-131.CHEN Ping,LI Junling,SHAO Tianmin,et al.Optimal analysis of geometric parameters of surface texture with surface tension considered[J].Journal of Mechanical Engineering,2016(19):123-131.