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化工进展  2015 

旋流脱气性能影响因素的CFD模拟

DOI: 10.16085/j.issn.1000-6613.2015.06.011

Keywords: 旋流器,柱径比,计算流体力学(CFD),脱气性能,进口流速

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Abstract:

液体脱气是工业生产环节不可缺少的部分。脱气式旋流器能够在线、快速地进行脱气工作,但目前发展处于初期阶段,对于其脱气性能影响因素的探究还不全面。本文采用计算流体动力学(CFD)的方法,运用流体力学软件Fluent,在H2O-CO2的两相体系、湍流模型采用Reynolds应力模型、多相流模型采用Mixture混合模型的条件下,对不同柱径比的液体脱气式旋流器进行数值模拟,利用旋流离心场的离心力和压力梯度对微小气泡进行分离,获得了对5~50μm不同直径气泡的分离性能以及进口流速对气泡分离性能的影响关系。研究发现,在一定条件下,随着柱径比值的增大,脱气效率总体上先逐渐增大,超过一个极限值后迅速减小,但柱径比越大,越有利于小气泡颗粒的迁移分离;分离效率随着进口流速增加而增加,到达极限之后效率降低。

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