Liu Fengxia   

Associate Professor
Supervisor of Doctorate Candidates
Supervisor of Master's Candidates

Title : 化工机械与安全实验室副主任

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Language:English

Paper Publications

Title of Paper:微曝氧化沟气液两相传质模型构建及传质影响因素分析

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Date of Publication:2019-01-05

Journal:过程工程学报

Included Journals:PKU

Volume:19

Issue:4

Page Number:676-684

ISSN No.:1009-606X

Key Words:气液两相流;传质;数值模拟;气含率;微孔曝气;横向流动

Abstract:基于ANSYS Fluent软件建立了微曝氧化沟气-液两相流动和溶解氧输运模型,对比不同工况下氧体积传质系数的实验测量值和模拟结果,误差在7%以内.采用验证可靠性的模型模拟研究了气泡直径、曝气量和横向流动速度对微曝氧化沟内氧传质的影响.结果 表明,气泡直径由1.5 mm增至3 mm时,氧体积传质系数由15.80 h-1降低至5.83 h-1;曝气量由0.5 m3/h增大至2 m3/h时,氧体积传质系数由4.21 h-1增至14.15 h-1,减小气泡直径和增大曝气量能明显提高氧体积传质系数.微曝氧化沟内气-液相间传质及溶解氧的分布受横向流动影响,开启单台和两台推流泵时,氧体积传质系数分别比无横向推流工况增大27.7%和42.4%,横向流动能有效提高气泡羽流内的气含率,增强氧传质效果.

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