基于FLUENT的双螺带混合机固液两相流数值模拟
|
摘要
针对面粉-水两相混合,设计出一款双螺带混合机模型,并运用流体分析软件FLUENT对其三维流场进行数值模拟。采用ICEM对模型进行非结构网格划分,通过欧拉多相流模型、RNG k-ε湍流模型进行仿真。在稳态条件下模拟槽内的压强分布、速度分布以及固体颗粒体积分数分布的情况。结果表明:双螺带桨对槽内的多相流搅拌效果较佳,且其迎流面和背流面附近容易出现速度峰谷值,产生明显的涡旋,使搅拌均匀。该研究结果为进一步优化混合机的性能提供了理论依据。
A twin-screw mixer model was designed for flour-water two-phase mixture,and its three-dimensional flow field was numerically simulated by FLUENT. Moreover,ICEM was used to divide the unstructured grids for the model,Euler multiphase flow model and RNG k-ε turbulence model were used for simulation. Under steady-state conditions,the pressure distribution,velocity distribution and solid particle volume fraction distribution in a twin-screw mixer were simulated. The results show that the twinscrew propeller has better stirring effect on the multi-phase flow in the tank,the peak and valley values of velocity tend to appear near the incident flow and backflow surface,producing obvious vortices,making the mixing more uniform. The results provide a theoretical basis for further optimization of the performance of the mixer.
A twin-screw mixer model was designed for flour-water two-phase mixture,and its three-dimensional flow field was numerically simulated by FLUENT. Moreover,ICEM was used to divide the unstructured grids for the model,Euler multiphase flow model and RNG k-ε turbulence model were used for simulation. Under steady-state conditions,the pressure distribution,velocity distribution and solid particle volume fraction distribution in a twin-screw mixer were simulated. The results show that the twinscrew propeller has better stirring effect on the multi-phase flow in the tank,the peak and valley values of velocity tend to appear near the incident flow and backflow surface,producing obvious vortices,making the mixing more uniform. The results provide a theoretical basis for further optimization of the performance of the mixer.
引文
[1]何玲,罗金刚,王仁伟.螺带式桨叶带宽对搅拌槽内油制辣椒固液两相流的影响[J].粮油食品科技,2015,23(6):115-118.
[2]朱雪琴.食品工业搅拌混合技术[J].包装与食品机械,1995(1):10-12.
[3]Fajner D,Pinelli D,Ghadge R S,Montante G.Solids distribution and rising velocity of buoyant solid particles in a vessel stirred with multiple impellers[J].Chemical Engineering Science,2008,63(24):5876-5882.
[4]朱桂华,柳颖娇,徐洪威,等.高黏度污泥螺带螺杆搅拌混合特性的数值模拟[J].安全与环境学报,2018,18(3):1121-1126.
[5]董敏,夏晨亮,李想.双螺带及六斜叶组合桨搅拌槽内部流场数值模拟[J/OL].排灌机械工程学报,2018(8):32-36.
[6]邓远锋,黄振峰,李欣欣.基于FLUENT的单层直叶搅拌槽混合时间的数值模拟[J].装备制造技术,2017(7):134-137.
[7]Kasat G R,Khopkar A R,Ranade V V.CFD simulation of liquid-phase mixing in solid-liquid stirred reactor[J].Chemical Engineering Science,2008,64(9):67-71.
[8]Dohi N,Takahashi K,Kawase Y.Power consumption and solid suspension performance of large-scale impellers in gas-liquid-solid three-phase stirred tank reactors[J].Chemical Engineering Journal,2004,97(2):103-108.
[9]杜飞龙,李少波,何玲.卧式组合搅拌槽内固液混合物多相流模拟分析[J].食品与机械,2013,29(5):111-114.
[10]詹民民,俞经虎,代欣.基于Fluent的搅拌桨数值仿真及结构优化[J].食品与机械,2017,33(3):75-79.
[11]夏蕊,郭贵生.基于CFD的卧式螺带混合机的混合过程分析[J].农机化研究,2014,36(7):31-34.
[12]赵小英,杜飞龙,向贤礼.基于Fluent的搅拌槽内多相流数值仿真及研究[J].制造业自动化,2015,37(13):109-112.
[13]毛娅,吕银雷,陈作炳,等.连续性颗粒物料搅拌机的内部流场数值分析[J].中国粉体技术,2016,22(5):78-81.
[14]黄娟,朱孔春.螺带-螺杆搅拌槽内流动与剪切特性的数值模拟[J].上海应用技术学院学报(自然科学版),2016,16(3):262-267.
[15]严宏志,李新明,吴波,等.卧式双轴搅拌槽的液固两相流数值分析[J].中南大学学报(自然科学版),2013,44(2):532-539.
[16]张敏革,张吕鸿,姜斌,等.双螺带螺杆桨气液混合性能数值模拟及其工业应用[J].天津大学学报,2012,45(6):546-551.
[17]周杰敏,余新旸,朱德泉,等.新型多功能搅拌混合机的设计[J].包装与食品机械,2005,23(6):23-25.
[18]王春娥,刘丽,韩婵娟.面粉黏度特性与面条品质的相关研究[J].现代面粉工业,2012,26(2):36-39.
[19]王敏英.小麦面粉及同质淀粉的粘度测定及分析[J].文物修复与研究,2007:102-105.
[20]李锦雄.面粉品质评定及粘度值的简易测定方法[J].广东饲料,2001(4):38-39.
[21]姚大年,李保云,梁荣奇,等.小麦品种面粉粘度性状及其在面条品质评价中的作用[J].中国农业大学学报,2000(3):25-29.
[22]段文广.基于FLUENT的搅拌机械内部流场模拟研究[J].现代制造技术备,2009(1):33-34.
[23]杨绮云,赵静静.食品双螺杆挤出机内物料停留时间及其分布研究[J].农业机械学报,2006(8):175-177.
[24]史仕荧,梁楚楚,孟熙然,等.双同向旋流场中液液变质量流动压降特性研究[J].流体机械,2018,46(4):12-17.
[25]杨琳琳,吴高杰,陈剑佩,等.螺带螺杆搅拌釜中高黏流体的CFD模拟计算[J].华东理工大学学报(自然科学版),2009,35(5):693-700.
[26]张志森,张裕中,张文明.工业流体混合技术现状与展望[J].包装与食品机械,2001(4):24-25.
[2]朱雪琴.食品工业搅拌混合技术[J].包装与食品机械,1995(1):10-12.
[3]Fajner D,Pinelli D,Ghadge R S,Montante G.Solids distribution and rising velocity of buoyant solid particles in a vessel stirred with multiple impellers[J].Chemical Engineering Science,2008,63(24):5876-5882.
[4]朱桂华,柳颖娇,徐洪威,等.高黏度污泥螺带螺杆搅拌混合特性的数值模拟[J].安全与环境学报,2018,18(3):1121-1126.
[5]董敏,夏晨亮,李想.双螺带及六斜叶组合桨搅拌槽内部流场数值模拟[J/OL].排灌机械工程学报,2018(8):32-36.
[6]邓远锋,黄振峰,李欣欣.基于FLUENT的单层直叶搅拌槽混合时间的数值模拟[J].装备制造技术,2017(7):134-137.
[7]Kasat G R,Khopkar A R,Ranade V V.CFD simulation of liquid-phase mixing in solid-liquid stirred reactor[J].Chemical Engineering Science,2008,64(9):67-71.
[8]Dohi N,Takahashi K,Kawase Y.Power consumption and solid suspension performance of large-scale impellers in gas-liquid-solid three-phase stirred tank reactors[J].Chemical Engineering Journal,2004,97(2):103-108.
[9]杜飞龙,李少波,何玲.卧式组合搅拌槽内固液混合物多相流模拟分析[J].食品与机械,2013,29(5):111-114.
[10]詹民民,俞经虎,代欣.基于Fluent的搅拌桨数值仿真及结构优化[J].食品与机械,2017,33(3):75-79.
[11]夏蕊,郭贵生.基于CFD的卧式螺带混合机的混合过程分析[J].农机化研究,2014,36(7):31-34.
[12]赵小英,杜飞龙,向贤礼.基于Fluent的搅拌槽内多相流数值仿真及研究[J].制造业自动化,2015,37(13):109-112.
[13]毛娅,吕银雷,陈作炳,等.连续性颗粒物料搅拌机的内部流场数值分析[J].中国粉体技术,2016,22(5):78-81.
[14]黄娟,朱孔春.螺带-螺杆搅拌槽内流动与剪切特性的数值模拟[J].上海应用技术学院学报(自然科学版),2016,16(3):262-267.
[15]严宏志,李新明,吴波,等.卧式双轴搅拌槽的液固两相流数值分析[J].中南大学学报(自然科学版),2013,44(2):532-539.
[16]张敏革,张吕鸿,姜斌,等.双螺带螺杆桨气液混合性能数值模拟及其工业应用[J].天津大学学报,2012,45(6):546-551.
[17]周杰敏,余新旸,朱德泉,等.新型多功能搅拌混合机的设计[J].包装与食品机械,2005,23(6):23-25.
[18]王春娥,刘丽,韩婵娟.面粉黏度特性与面条品质的相关研究[J].现代面粉工业,2012,26(2):36-39.
[19]王敏英.小麦面粉及同质淀粉的粘度测定及分析[J].文物修复与研究,2007:102-105.
[20]李锦雄.面粉品质评定及粘度值的简易测定方法[J].广东饲料,2001(4):38-39.
[21]姚大年,李保云,梁荣奇,等.小麦品种面粉粘度性状及其在面条品质评价中的作用[J].中国农业大学学报,2000(3):25-29.
[22]段文广.基于FLUENT的搅拌机械内部流场模拟研究[J].现代制造技术备,2009(1):33-34.
[23]杨绮云,赵静静.食品双螺杆挤出机内物料停留时间及其分布研究[J].农业机械学报,2006(8):175-177.
[24]史仕荧,梁楚楚,孟熙然,等.双同向旋流场中液液变质量流动压降特性研究[J].流体机械,2018,46(4):12-17.
[25]杨琳琳,吴高杰,陈剑佩,等.螺带螺杆搅拌釜中高黏流体的CFD模拟计算[J].华东理工大学学报(自然科学版),2009,35(5):693-700.
[26]张志森,张裕中,张文明.工业流体混合技术现状与展望[J].包装与食品机械,2001(4):24-25.