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化工学报  2015 

静止非牛顿流体中气泡生成过程的传质

DOI: 10.11949/j.issn.0438-1157.20150417, PP. 4335-4341

Keywords: 非牛顿流体,气泡生成,传质,二氧化碳

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Abstract:

气泡生成过程中气液传质是气液接触设备的设计、优化的重要参考指标。以二氧化碳气泡在羧甲基纤维素钠(carboxymethylcellulose,CMC)溶液中生成过程中的传质为研究对象,分别考察了气速、CMC溶液浓度、针头直径对气泡生成过程气液传质的影响,采用具有CCD显微相机的动态接触角分析仪测量了气泡形状、表面积和体积的变化,进而获得气泡生成过程气液传质系数kl。实验结果表明,CMC浓度从0.2%增加到0.8%,黏度逐渐增大,传质系数随CMC浓度的增大而增大;针头直径从2.5mm增加到4mm,传质系数也随之增大;气速从1ml·min-1增加到9ml·min-1,传质系数也逐渐增大。

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