[1]许晓飞,魏文泽,曾 倩,等.微曝氧化沟水力特性和气泡羽流传质规律研究[J].常州大学学报(自然科学版),2018,30(05):23-31.[doi:10.3969/j.issn.2095-0411.2018.05.004]
 XU Xiaofei,WEI Wenze,ZENG Qian,et al.Hydrodynamics and Bubble Plume Mass Transfer Characteristics in Microporous Aeration Oxidation Ditch[J].Journal of Changzhou University(Natural Science Edition),2018,30(05):23-31.[doi:10.3969/j.issn.2095-0411.2018.05.004]
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微曝氧化沟水力特性和气泡羽流传质规律研究()
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常州大学学报(自然科学版)[ISSN:2095-0411/CN:32-1822/N]

卷:
30
期数:
2018年05期
页码:
23-31
栏目:
机械制造及其自动化
出版日期:
2018-09-28

文章信息/Info

Title:
Hydrodynamics and Bubble Plume Mass Transfer Characteristics in Microporous Aeration Oxidation Ditch
作者:
许晓飞魏文泽曾 倩刘凤霞刘志军
大连理工大学 流体与粉体工程研究设计所,辽宁 大连 116024
Author(s):
XU Xiaofei WEI Wenze ZENG Qian LIU Fengxia LIU Zhijun
Research & Design Institute of Fluid and Powder Engineering, Dalian University of Technology, Dalian 116024, China
关键词:
微曝氧化沟 气泡羽流 非牛顿流体 横向流动 传质
Keywords:
microporous aeration oxidation ditch bubble plume non-Newtonian fluid cross flow mass transfer
分类号:
TQ 021.4
DOI:
10.3969/j.issn.2095-0411.2018.05.004
文献标志码:
A
摘要:
研究微曝氧化沟曝气充氧和横向推流配合运行状态下非牛顿流体流动和气液两相传质问题,有助于实现氧化沟的优化设计和高效运行。以微曝氧化沟内清水和不同质量分数的羧甲基纤维素钠(CMC)水溶液为实验对象,研究曝气量、横向推流强度、曝气器布置方式和液相流变特性对微曝氧化沟内水力特性和气泡羽流传质的影响。实验结果表明,液相的流变特性对微曝氧化沟内水力和传质参数均有较大影响。与清水相比,CMC水溶液中沟道底部流速更小,体积氧传质系数更低。氧化沟底部横向流速随着曝气量的增大呈先减小后增大的变化趋势。基于量纲分析,得到气泡直径和体积氧传质系数的无量纲关联式,可为微曝氧化沟系统实现节能降耗和优化运行的目的提供理论依据。
Abstract:
The study of non-Newtonian fluid flow and gas-liquid mass transfer under the coordinated operation of aerator and flowmaker in microporous aeration oxidation ditch is helpful to optimize the design and efficient operation of the oxidation ditch. Tap water and carboxyl methyl cellulose(CMC)aqueous solution with different mass fraction were selected to study the hydrodynamics and mass transfer in microporous aeration oxidation ditch by accounting for the effect of aeration rate, cross flow strength, aerator arrangement and liquid phase rheological properties. The experimental results show that the rheological properties of liquid phase have great influence on the hydraulic and mass transfer parameters in microporous aeration oxidation ditch. Compared with the clean water, the flow velocity at the bottom of the ditch is smaller and the volumetric oxygen mass transfer coefficient is lower than those in CMC aqueous solutions. The cross flow velocity at the bottom of the ditch decreases first and increases then with the increase of aeration rate. Based on the dimensional analysis, dimensionless correlations of bubble diameter and oxygen mass transfer coefficient are obtained. It can provide a theoretical basis for the purpose of saving energy and optimizing operation of the microporous aeration oxidation ditch system.

参考文献/References:


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备注/Memo

备注/Memo:
收稿日期:2018-05-04。
基金项目:国家自然科学
基金项目(11502046); 教育部留学回国人员科研启动基金项目(第50批); 辽宁省博士科研启动
基金项目(201501179)。
作者简介:许晓飞(1981—), 男, 辽宁大连人, 博士, 副教授。通信联系人:刘志军(1969—), E-mail: liuzj@dlut.edu.cn
更新日期/Last Update: 2018-09-28