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收稿日期:
2024-05-06
修回日期:
2024-06-12
出版日期:
2024-07-17
通讯作者:
谷德银
作者简介:
谷德银(1989—),男,博士,副教授,gdy0811@126.com.
基金资助:
Deyin GU1(), changshu LI1, Hao YANG1, Zuohua LIU2
Received:
2024-05-06
Revised:
2024-06-12
Online:
2024-07-17
Contact:
Deyin GU
摘要:
为减小混合隔离区,增大混沌混合区,强化流体的混沌混合过程。本文基于分形理论的自相似特性,提出了一种具有分形排布式穿流孔的搅拌桨来强化流体的混沌混合行为。采用计算流体力学(CFD)和实验相结合的方法探究了流体混合过程中的功耗特性、速度分布、剪切应变率分布、隔离区结构以及庞加莱截面。研究结果表明,在相同Reynolds数下,与Rushton桨相比,分形排布式穿流搅拌桨(FAPT)能够有效降低搅拌功耗和功率准数,且随着穿流孔分形迭代次数的增加,搅拌功耗和功率准数进一步降低。其中,FAPT-1体系的功率准数降低6.57%~12.50%,FAPT-2体系的功率准数降低10.95%~19.32%,FAPT-3体系的功率准数降低15.25%~24.66%。在相同功耗下,与Rushton桨相比,FAPT桨能够增强对流体的剪切作用,增大剪切应变率,减小混合隔离区,缩短流体的混合时间,提高流体的混合效率,且随着穿流孔分形迭代次数的增加,这一效果更为明显。
中图分类号:
谷德银, 李昌树, 杨豪, 刘作华. 分形排布式穿流搅拌桨强化流体混沌混合行为研究[J]. 化工学报, DOI: 10.11949/0438-1157.20240488.
Deyin GU, changshu LI, Hao YANG, Zuohua LIU. Study on fluid chaotic mixing behavior intensified by a fractal-arranged perforated impeller[J]. CIESC Journal, DOI: 10.11949/0438-1157.20240488.
图6 不同搅拌桨体系中功耗、功率准数以及Reynolds数与功率准数乘积随Reynolds数的变化
Fig.6 Variation of power consumption and power number with Reynolds number in different impeller systems
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