机械搅拌槽内非牛顿流体内流特性研究

doi:10.3901/JME.2021.20.244

机械工程学报 ›› 2021, Vol. 57 ›› Issue (20): 244-253.doi: 10.3901/JME.2021.20.244

扫码分享

机械搅拌槽内非牛顿流体内流特性研究

方玉建¹, 张敏², 孙先朋², 张金凤², 瞿晔飞¹

1. 江苏大学京江学院镇江 212000;
2. 江苏大学国家水泵及系统工程技术研究中心镇江 212000

收稿日期:2020-03-05 修回日期:2021-03-18 出版日期:2021-10-20 发布日期:2021-12-15
通讯作者: 张金凤(通信作者),女,1981年出生,博士,研究员。主要研究方向为流体机械水力设计优化及内部流动特性。E-mail:zhangjinfeng@ujs.edu.cn
作者简介:方玉建,男,1976年出生,博士,讲师。主要研究方向为流体机械水力设计优化及内部流动特性。E-mail:eugenef@126.com
基金资助:
国家重点研发计划（2018YFB06061001）和江苏省重点研发计划（BE2019009-1）资助项目。

Study on Internal Flow Characteristics of Non-Newtonian Fluids in Mechanical Stirred Tank

FANG Yujian¹, ZHANG Min², SUN Xianpeng², ZHANG Jinfeng², QU Yefei¹

1. Jingjiang College, Jiangsu University, Zhenjiang 212000;
2. Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212000

Received:2020-03-05 Revised:2021-03-18 Online:2021-10-20 Published:2021-12-15

摘要/Abstract

摘要： 在工业生产中获得广泛应用的机械搅拌混合，其流体大都是非牛顿流体，具有与牛顿流体不同的流变性质（弹性效应，剪切稀化以及剪切变稠），所以急需对非牛顿流体情况下搅拌槽内的内流特性开展研究。基于Lin-A315桨型的粒子图像测速技术（Particle Image velocimetry，PIV）试验结果对搅拌槽内非牛顿流体的流场特性进行定常/非定常数值模拟，研究不同质量分数的黄原胶溶液在不同搅拌速度下的轴面流速分布、湍动能分布、径向截线的流速剖面、所需要的搅拌混合时间以及搅拌能耗。结果表明，数值模拟可以很好地模拟分析机械搅拌槽内非牛顿流体的流场特性；提高搅拌速度可以增加槽内主循环流的范围和强度，搅拌槽内涡的分布和湍动能分布范围也相应变大，与100 r/min相比，300 r/min和500 r/min工况下的轴向速度最大值增加3.6倍和5.9倍，所需要的混合时间缩短0.46倍和0.36倍；增加黄原胶溶液的浓度会减小流场的主循环流范围，增加速度梯度，降低槽底区域循环速度，所以与非牛顿流体溶液浓度的变化相比，所需要混合时间对转速变化更为敏感；另外提高搅拌速度会增加搅拌能耗，因此对低浓度非牛顿流体宜选择中等转速、高浓度非牛顿流体宜选择高转速以有利于溶液混合和能源节约。

关键词: 机械搅拌槽, 非牛顿流体, PIV, 数值模拟, 流场特性

Abstract: Most of the fluids, involved in mechanical agitation widely applied in the industry, are non-Newtonian ones and have different rheological properties from Newtonian fluids (elastic effect, shear thinning and shear thickening), so there is an urgent need to study the internal flow characteristics of non-Newtonian fluids in a mechnical stirred tank. Based on the results of Lin-A315 particle image velocimetry (PIV) experiment results, steady and unsteady numerical simulations are carried out with non-Newtonian fluid in the stirred tank. The distribution of flow field, turbulent kinetic energy at the axial section, the flow velocity profile at the radial transversely line, the necessary mixing time and the corresponding energy consumption are investigated and compared with experiments for xanthan gum solution with different mass fractions at different speeds. The results show that the internal flow characteristics revealed by numerical simulation agrees quite well with experiment for non-Newtonian fluid in the stirred tank. Increasing the stirring speed, the range and size of the main circulation flow are enlarged, and the distribution range of vortex and turbulent kinetic energy in the tank is increased as well. Compared with 100 r/min, higher stirring speeds 300 r/min and 500 r/min lead to the maximum axial velocity increased by 3.6 times and 5.9 times, and the necesary mixing time shortened by 0.46 times and 0.36 times. As the concentration of xanthan gum rising, the main circulation range of the flow field shrunk, the velocity gradient increased, the circulating velocity in the bottom zone is reduced, so the necessary mixing time is more sensitive to the the stirring speed than the concentration of non-Newtonian fluid. But increasing the stirring speed for non-Newtonian fluid will lead to higher energy consumption. Therefore, medium speed shall be preferred for low concentration non-Newtonian fluid and high speed be preferred in case of high concentration for better mixing performance and energy saving.

Key words: stirred tank, non-Newtonian fluid, PIV, numerical simulation, flow field characteristics

中图分类号:

TQ027

方玉建, 张敏, 孙先朋, 张金凤, 瞿晔飞. 机械搅拌槽内非牛顿流体内流特性研究[J]. 机械工程学报, 2021, 57(20): 244-253.

FANG Yujian, ZHANG Min, SUN Xianpeng, ZHANG Jinfeng, QU Yefei. Study on Internal Flow Characteristics of Non-Newtonian Fluids in Mechanical Stirred Tank[J]. Journal of Mechanical Engineering, 2021, 57(20): 244-253.

参考文献

[1] BUFFO A,VANNI M,MARCHISIO D L. Multidimensional population balance model for the simulation of turbulent gas-liquid systems in stirred tank reactors[J]. Chemical Engineering Science,2012,70(10):31-44.
[2] 王凯,虞军. 搅拌设备[M]. 北京:化学工业出版社,2003. WANG Kai,YU Jun. Stirring equipment[M]. Beijing:Chemical Industry Press,2003.
[3] EIN-MOZAFFARI F,UPRETI S R. Using ultrasonic Doppler velocimetry and CFD modeling to investigate the mixing of non-Newtonian fluids possessing yield stress[J]. Chemical Engineering Research & Design,2009,87:515-523.
[4] 栾德玉,张盛峰,郑深晓,等. 基于流固耦合的错位桨搅拌假塑性流体动力学特性[J]. 化工学报,2017,68(6):2328-2335. LUAN Deyu,ZHANG Shengfeng,ZHENG Shenxiao,et al. Dynamic characteristics of impeller of perturbed six-bent-bladed turbine in pseudoplastic fluid based on fluid-structure interaction[J]. CIESC Journal,2017,68(6):2328-2335.
[5] 韩丹,李龙,程云山,等. 现代搅拌技术的研究进展[J]. 食品与机械,2004,20(4):31-34. HAN Dan,LI Long,CHENG Yunshan,et al. Research development of modern stirring technology[J]. Food and Machinery,2004,20(4):31-34.
[6] BAKKER B,VAN DEN AKKER H E A. Single-phase flow in stirred reactors[J]. Chemical Engineering Research & Design,1994,72(4):583-593.
[7] MURTHY B N,JOSHI J B. Assessment of standard k-ε、RSM and LES turbulence models in a baffled stirred vessel agitated by various impeller designs[J]. Chemical Engineering Science,2008,63(22):5468-5495.
[8] 洪厚胜,张庆文,万红贵,等. 搅拌生物反应器混合特性的数值模拟与试验研究[J]. 过程工程学报,2005,5(2):131-134. HONG Housheng,ZHANG Qingwen,WAN Honggui,et al. Numerical simulation and experimental study on mixing characteristics of stirred bioreactor[J]. The Chinese Journal of Process Engineering,2005,5(2):131-134.
[9] ZAMIRI Ali,CHUNG Jin. Numerical evaluation of turbulent flow structures in a stirred tank with a Rushton turbine based on scale-adaptive simulation[J]. Computers & Fluids,2018,170(18):236-248.
[10] MERONEY R N,COLORADO P E. CFD simulation of mechanical draft tube mixing in anaerobic digester tanks[J]. Water Research,2009,43(4):1040-1050.
[11] AMEUR H. Agitation of yield stress fluids in different vessel shapes[J]. Engineering Science & Technology an International Journal,2016,19(1):189-196.
[12] 徐玉明,迟卫,莫立新. PIV测试技术及其应用[J]. 舰船科学技术,2007,29(3):101-105. XU Yuming,CHI Wei,MO Lixin. PIV test technology and its application[J]. Ship Science and Technology,2007,29(3):101-105.
[13] SHARP K V,ADRIAN R J. PIV study of small-scale flow structure around a Rushton turbine[J]. AIChE,2001,47(4):766-778.
[14] KHAN F R,RIELLY C D,BROWN D A R. Angle-resolved stereo-PIV measurements close to a down-pumping pitched-blade turbine[J]. Chemical Engineering Science,2006,61(9):2799-2806.
[15] CHUNG K H K,BARIGOU M,SIMMONS M J H. Reconstruction of 3-D flow field inside miniature stirred vessels using a 2-D PIV technique[J]. Chemical Engineering Research & Design,2007,85(5):560-567.
[16] SONG K W,KIM Y S,CHANG G S. Rheology of concentrated xanthan gum solutions:Steady shear flow behavior[J]. Fibers & Polymers,2006,7(2):129-138.
[17] JUNKER B H,STANIK M,BARNA C,et al. Influence of impeller type on mass transfer in fermentation vessels[J]. Bioprocess Engineering,1998,19(6):403-413.
[18] SHIH T H,LIOU W W,SHABBIR A,et al. A new kappa-epsilon eddy viscosity model for high Reynolds number turbulent flows[J]. Computers and Fluids,1995,24(3):227-238.
[19] KIM S E,CHOUDHURY D,PATEL B. Computations of complex turbulent flows using the commercial code fluent[J]. Modeling Complex Turbulent Flows,1999:259-276.
[20] 李鹏飞,徐敏义,王飞飞. 精通CFD工程仿真与案例实战[M]. 北京:人民邮电出版社,2011. LI Pengfei,XU Minyi,WANG Feifei. Proficient in CFD engineering simulation and case practice[M]. Beijing:People's Posts and Telecommunications Press,2011.

机械搅拌槽内非牛顿流体内流特性研究

Study on Internal Flow Characteristics of Non-Newtonian Fluids in Mechanical Stirred Tank

PDF

可视化

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 15

编辑推荐

Metrics

本文评价

[1]	梁伟, 郑颖, 邓德安. 外拘束对铝合金薄板结构焊接变形的影响[J]. 机械工程学报, 2021, 57(6): 70-77.
[2]	尹东杨, 陈晓川, 鲍劲松. 基于磨料水射流的三维编织复合材料铣削技术研究[J]. 机械工程学报, 2021, 57(5): 273-280.
[3]	杜冰, 赵翀昊, 谢军, 李晗, 赵长财, 杜之明. 应力加载路径对板壳塑性起皱失稳极限的影响研究[J]. 机械工程学报, 2021, 57(4): 83-91.
[4]	秦国梁, 耿培皓, 陈永, 任文建. 铝/钢异种金属MIG电弧熔-钎焊接界面应力演变数值分析[J]. 机械工程学报, 2021, 57(2): 87-96.
[5]	张嘉, 吴奇. Inconel718微环形零件激光增材制造残余应力数值分析[J]. 机械工程学报, 2021, 57(18): 172-181.
[6]	王权岱, 杨新宇, 惠振文, 赵仁峰, 杨振朝, 郭美玲, 李言. 约束面投影成型基底表面微织构特征对固化层分离力的影响[J]. 机械工程学报, 2021, 57(17): 196-206.
[7]	黄学颖, 于高潮, 翟瑞雪, 马瑞, 周超, 高才良, 赵军. 大型直缝焊管三辊连续复合矫形工艺的辊形设计及过程仿真[J]. 机械工程学报, 2021, 57(10): 148-159.
[8]	张超华, 王晓霞, 常茂椿, 王虎, 叶延洪, 邓德安. 焊缝金属的屈服强度和材料的加工硬化对Q345钢焊接残余应力与变形计算精度的影响[J]. 机械工程学报, 2021, 57(10): 160-168.
[9]	朱东彬, 吴民强, 王竹贤, 杨伟东. 基于微滴喷射3D打印的纳米颗粒悬浮墨水稳定喷射研究[J]. 机械工程学报, 2020, 56(9): 243-251.
[10]	赵长财, 袁荣娟, 郝海滨, 胡丽梅, 贾向东. 高压气瓶辊模拉拔力的理论计算与数值模拟[J]. 机械工程学报, 2020, 56(4): 49-56.
[11]	陈翔, 陈伟, 禄盛, 金晓清, 马文生, 赵洋. NiTiNb记忆合金热力学性能的试验及其唯象本构模型[J]. 机械工程学报, 2020, 56(4): 65-75.
[12]	史俊杰, 许昌, 雷娇, 李林敏, 薛飞飞, 韩星星. 典型山丘地形与风力机诱导涡流耦合演变规律[J]. 机械工程学报, 2020, 56(4): 85-94.
[13]	董星, 刘雨庆, 段雄. 前混合水射流多弹丸喷丸模型及残余应力场的数值模拟[J]. 机械工程学报, 2020, 56(4): 224-232.
[14]	樊丁, 韩苗苗, 李春玲, 于晓全, 赵金龙. 随焊氩气激冷控制铝/钢薄板残余应力与变形研究[J]. 机械工程学报, 2020, 56(22): 76-81.
[15]	胡建军, 杨子文, 金瑶兰, 王思民, 孔祥东. 近距离淹没冲击射流动态流场特性[J]. 机械工程学报, 2020, 56(22): 263-270.