动态混合器内流动和混合特性的CFD模拟
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摘要
首先建立了动态混合器的三维实体模型,然后利用动态方腔拖曳流的粒子图像测速(PIV)流场实验检验了模拟方法的可靠性。在此基础上对动态混合器进行了计算流体力学(CFD)模拟,研究了进料量和操作转速对混合器内流动和混合特性的影响规律。研究结果表明:动态混合器的高剪切速率主要集中在定转子交界处;动态混合器出口处的浓度分布标准差正比于质量流量,反比于转速。最后提出了一种评价动态混合器操作性能的新方法。
Dynamic mixers have many advantages and a wide range of applications in the field of high viscosity polymer blending. In this paper,the 3D model of dynamic mixer is established firstly,and then the reliability of the simulation method is verified by flow field of the dynamic lid-driven cavity obtained by the particle image velocimetry( PIV) experiments. Based on the simulation method,the effects of feed rate and operating speed on the flow and mixing characteristics in the dynamic mixer were studied. Studies have shown that the high shear rate region of the dynamic mixer is mainly concentrated at the junction of the stator and rotor,and that the standard deviation of the concentration distribution at the outlet of the dynamic mixer is proportional to the mass flow rate and inversely proportional to the operating speed. Finally,a new method for evaluating the operating performance of a dynamic mixer is presented.
Dynamic mixers have many advantages and a wide range of applications in the field of high viscosity polymer blending. In this paper,the 3D model of dynamic mixer is established firstly,and then the reliability of the simulation method is verified by flow field of the dynamic lid-driven cavity obtained by the particle image velocimetry( PIV) experiments. Based on the simulation method,the effects of feed rate and operating speed on the flow and mixing characteristics in the dynamic mixer were studied. Studies have shown that the high shear rate region of the dynamic mixer is mainly concentrated at the junction of the stator and rotor,and that the standard deviation of the concentration distribution at the outlet of the dynamic mixer is proportional to the mass flow rate and inversely proportional to the operating speed. Finally,a new method for evaluating the operating performance of a dynamic mixer is presented.
引文
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[2]JIANG Z,GUO Z,JIA Z,et al.Mixing mechanism and evaluation of the dispersion effect of a 3D dynamic mixer[J].Journal of Testing&Evaluation,2016,44(1):367-375.
[3]DICKMEIB F,ALEXANDER J,杨铖.现代纺丝设备中的添加剂注入和混合[J].国际纺织导报,2014,42(2):16-22.DICKMEIB F,ALEXANDER J,YANG C.Additive injection and mixing in modern spinning equipment[J].Melliand China,2014,42(2):16-22.(in Chinese)
[4]DICKMEIB F,邹海霞.颜料注射-合成纤维的纺前染色[J].国际纺织导报,2002,1(1):32-37.DICKMEIB F,ZOU H X.Color injection-mass-dyeing of synthetic fibers[J].Melliand China,2002,1(1):32-37.(in Chinese)
[5]崔利,庄耀中,姚敏刚,等.267 dtex/288 f竹炭涤纶预取向丝的生产开发[J].合成纤维,2015,44(6):19-21.CUI L,ZHUANG Y Z,YAO M G,et al.Development of267dtex/288f bamboo charcoal polyester pre-oriented yarn[J].Synthetic Fiber in China,2015,44(6):19-21.(in Chinese)
[6]张志强,王大中,叶南飚.双螺杆挤出机的排气原理及在改性ABS中的应用[J].塑料工业,2013,41(12):39-43.ZHANG Z Q,WANG D Z,YE N B.The exhaust principle of twin-screw extruder and application in modified ABS[J].China Plastics Industry,2013,41(12):39-43.(in Chinese)
[7]贾朝阳,张小莹,梁晓刚.同向双螺杆挤出机在聚合物脱挥中的应用研究[J].中国塑料,2012,26(8):107-110.JIA C Y,ZHANG X Y,LIANG X G.Application of corotating twin-screw extruder in devolatilization of polymer[J].China Plastics,2012,26(8):107-110.(in Chinese)
[8]徐能,金志明,薛平.行星挤出机的研究与应用进展[J].塑料工业,2011,39(9):9-10.XU N,JIN Z M,XUE P.Research and application progress of planetary extruder[J].China Plastics Industry,2011,39(9):9-10.(in Chinese)
[9]尤作虎,郝恩全,宋云鹤.行星挤出机在PVC压延薄膜生产线上的应用[J].现代塑料加工应用,2006,18(1):26-27.YOU Z H,HAO E Q,SONG Y H.Application of planetary extruder to production line of PVC calendaring films[J].Modern Plastics Processing and Applications,2006,18(1):26-27.(in Chinese)
[10]刘晶,薛平,金志明.行星螺杆挤出机的发展[J].中国塑料,2013,27(3):1-5.LIU J,XUE P,JIN Z M.Development of planetary roller extruders[J].China Plastics,2013,27(3):1-5.(in Chinese)
[11]TANG Y.Recycled rubber processing and performance enhancement:US 6590042 B1[P].2003-07-08.
[12]MOURI M,USUKI A,MURASE A,et al.Method of manufacturing devulcanized rubber using high temperature and shearing pressure:US 6133413 A[P].2000-10-17.
[13]黄凤磊,刘淼,李志鹏,等.共混用动态混合器的研究与应用进展[J].化工进展,2017,36(10):3549-3557.HUANG F L,LIU M,LI Z P,et al.Research and application progress of dynamic mixers for polymer blending[J].Chem Ind&Eng Pro,2017,36(10):3549-3557.(in Chinese)
[14]柳天磊,王建鸿,杜遥雪.注塑机螺杆混炼元件混炼性能对比研究[J].工程塑料应用,2013,41(4):51-54.LIU T L,WANG J H,DU Y X.Comparative study on plasticizing properties of screw mixing units for injection machine[J].Engineering Plastics Application,2013,41(4):51-54.(in Chinese)
[15]赵式英,王宝灵.球窝型动态混合器结构和机理的研究[J].合成纤维工业,1991,14(5):26-31.ZHAO S Y,WANG B L.Research of the structure and mechanism of spherical cavity type dynamic mixer[J].Synthetic Fiber Industry,1991,14(5):26-31.(in Chinese)
[16]姜兆辉,金剑,肖长发.熔体直纺在线添加制备差别化聚酯纤维研究进展[J].高分子通报,2011,10(5):10-16.JIANG Z H,JIN J,XIAO C F.The progress in preparation of differential polyester fiber by directly melt spinning[J].Chinese Polymer Bulletin,2011,10(5):10-16.(in Chinese)
[17]赵式英,王宝灵,蒋宝春,等.高粘流体混合用动态混合器[J].塑料,1991,20(1):35-40.ZHAO S Y,WANG B L,JIANG B C,et al.Dynamic mixer for high viscous fluids[J].Plastics,1991,20(1):35-40.(in Chinese)
[18]揣成智,EDWARDS M F.腔穴传递式混合器的工作原理和特性[J].塑料,1993,22(6):16-19.CHUAI C Z,EDWARDS M F.Working principle and characteristics of cavity transfer mixer[J].Plastics,1993,22(6):16-19.(in Chinese)
[19]姜兆辉,金剑,肖长发,等.炭黑母粒分散性的定量表征[J].纺织学报,2011,32(11):17-22.JIANG Z H,JIN J,XIAO C F,et al.Quantitative characterization of dispensability of carbon black masterbatch[J].Journal of Textile Research,2011,32(11):17-22.(in Chinese)
[20]RAZA A H,LAI-FOOK R A,LAWRENCE C J,et al.Theoretical and experimental characterization of emulsion flow in a cavity transfer mixer[C]∥Joint Fluids Summer Engineering Conference.Honolulu,2003:2391-2398.