Fluid-structure interaction in liquid mixing intensified by flexible-rigid impeller

doi:10.11949/j.issn.0438-1157.20141571

CIESC Journal ›› 2015, Vol. 66 ›› Issue (10): 3849-3856.DOI: 10.11949/j.issn.0438-1157.20141571

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Fluid-structure interaction in liquid mixing intensified by flexible-rigid impeller

ZHU Jun¹, ZHOU Zhenglin¹, LIU Zuohua^1,2, ZHENG Xiongpan¹, LIU Renlong¹, TAO Changyuan¹, WANG Yundong²

1 School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China;
2 Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

Received:2014-10-22 Revised:2015-04-20 Online:2015-10-05 Published:2015-10-05
Supported by:
supported by the National Basic Research Program of China (2012CBA01203), the State Key Laboratory of Chemical Engineering (SKL-ChE-12A02) and the Key Natural Science Fund of Chongqing (CSTC2012JJB0006).

刚柔组合搅拌桨强化流体混合的流固耦合行为

朱俊¹, 周政霖¹, 刘作华^1,2, 郑雄攀¹, 刘仁龙¹, 陶长元¹, 王运东²

1 重庆大学化学化工学院, 重庆 400044;
2 清华大学化学工程系, 北京 100084

通讯作者: 刘作华
基金资助:
国家重点基础研究发展计划项目(2012CBA01203);清华大学化学工程联合国家重点实验室开放课题(SKL-ChE-12A02);重庆市自然科学基金重点项目(CSTC2012JJB0006)。

Abstract

Abstract:

Traditional rigid impeller transfers energy by shearing action, while flexible-rigid impeller can intensify energy transfer by multiple-body movement. Based on the interaction between impeller and fluid, the equivalent stress and total deformation are computationally simulated for flexible-rigid and rigid impellers. Macroscopic flow structure is obtained by two-way fluid-structure interaction technique with simulation platform ANSYS Workbench, and the mixing effect in two stirred systems are discussed with measured mixing time and calculated impeller power dissipation. Compared with rigid impeller, the mixing time of flexible-rigid impeller system is decreased by 32%, its power dissipation is declined by 7%, its total deformation of blade tip is 10⁵ times larger, and its equivalent stress of blade tip is 83% greater, so that flexible-rigid impeller exerts greater force to fluid with the fluid-structure interaction, which contributes to energy transmission, liquid flow and mixing intensification.

Key words: mixing, fluid, transfer, flexible-rigid impeller, ANSYS Workbench, fluid-structure interaction

摘要：

传统刚性搅拌桨通过对流体的剪切作用实现能量的传递,而刚柔组合搅拌桨可通过其多体运动行为强化能量传递。基于搅拌桨桨叶与流体之间的耦合运动作用,结合ANSYS Workbench仿真平台,采用双向流固耦合方法,模拟计算了刚性搅拌桨与刚柔组合搅拌桨桨叶的等效应力和总变形量,研究了流场的宏观结构;并通过测定混合时间和计算搅拌桨功耗对比分析了两种不同搅拌体系的混合行为。结果表明:刚柔组合搅拌桨使体系的混合时间缩短了近32%,搅拌桨功耗下降了7%,其桨叶尖端的变形量是刚性搅拌桨的10⁵倍,其应力比刚性搅拌桨增加了83%;与刚性搅拌桨相比,刚柔组合搅拌桨在流固耦合作用下对流体的作用力更大,能够更好地传递能量,增强流体运动,强化流体混合。

关键词: 混合, 流体, 传递, 刚柔组合搅拌桨, ANSYS Workbench, 流固耦合

CLC Number:

TQ027.2

ZHU Jun, ZHOU Zhenglin, LIU Zuohua, ZHENG Xiongpan, LIU Renlong, TAO Changyuan, WANG Yundong. Fluid-structure interaction in liquid mixing intensified by flexible-rigid impeller[J]. CIESC Journal, 2015, 66(10): 3849-3856.

朱俊, 周政霖, 刘作华, 郑雄攀, 刘仁龙, 陶长元, 王运东. 刚柔组合搅拌桨强化流体混合的流固耦合行为[J]. 化工学报, 2015, 66(10): 3849-3856.

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Fluid-structure interaction in liquid mixing intensified by flexible-rigid impeller

刚柔组合搅拌桨强化流体混合的流固耦合行为

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