计及气泡诱导与剪切湍流的气泡破碎、湍流相间扩散及传质模型  

Bubble breakage, turbulence dispersion and mass transfer model considering the joint effects of bubble-induced turbulence and shear turbulence

作　　者：施炜斌 龙姗姗 杨晓钢 蔡心悦 SHI Weibin;LONG Shanshan;YANG Xiaogang;CAI Xinyue(College of Mechanical Engineering and Automation,Huaqiao University,Xiamen 361021,Fujian,China;Department of Mechanical,Materials and Manufacturing Engineering,University of Nottingham,Ningbo 315100,Zhejiang,China)

机构地区：[1]华侨大学机电及自动化学院,福建厦门361021 [2]宁波诺丁汉大学机械、材料与制造工程系,浙江宁波315100

出　　处：《化工学报》2022年第6期2573-2588,共16页CIESC Journal

基　　金：国家自然科学基金项目(91534118,21761132026);福建省自然科学基金项目(2021J01296)。

摘　　要：在以鼓泡塔为代表的气液鼓泡流动中,存在着气泡诱导湍流(BIT)和剪切湍流两种湍流机制,并且二者在不同的时间、空间范围内既相互竞争又共同作用。受制于BIT动能能谱的形式和特性不够完整清晰,过去的研究中关于BIT如何对气泡破碎聚并、相间作用力、相间传热传质等相间相互作用过程产生影响的结论比较模糊。因此,本文在具有波数κ-3特性的BIT能谱的基础上,提出了在不同工况下考虑BIT与剪切湍流共同作用的研究思路。研究结果表明,考虑两种湍流机制的气泡破碎模型和湍流相间扩散模型对BIT在整体或局部占据不同程度主导地位的情况,都能很好地捕捉气液鼓泡流动的动力学特性,为进一步准确揭示气液相间传质过程的内在机理提供了基础。In the gas-liquid bubbling flow represented by the bubble column,there are two turbulence mechanisms,the bubble induced turbulence(BIT)and the shear turbulence,and they both compete and work together in different time and space ranges.There are uncertainties remain in how BIT affects the bubble breakage and coalescence,the interphase interaction forces and the mass transfer,due to the limited understanding of the BIT energy spectrum.Considering the joint effects of bubble-induced turbulence and shear turbulence,we proposed the bubble breakage model and the turbulence dispersion force model in dealing with the global or the local dominance of BIT.For different operating conditions,these models have performed well in capturing the dynamic behaviors of both the gas-and the liquid-phase,which offers fresh insights into understanding the mechanisms of the interphase mass transfer process in the gas-liquid bubbly flows.

关 键 词：气泡 湍流 传质 种群平衡 大涡模拟 气液两相流 鼓泡塔 

分 类 号：TQ021.1[化学工程]