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化工学报  2014 

气液传质过程中Marangoni对流的观测与定量分析

DOI: 10.3969/j.issn.0438-1157.2014.10.003, PP. 3760-3768

Keywords: Marangoni对流,纹影,解吸,界面,传质,浓度分布,界面张力梯度

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Abstract:

建立了一套气液传质装置和一套纹影系统对乙醇解吸CO2过程中产生的Marangoni对流结构进行垂直界面方向上的观察,发现解吸过程中近界面处出现均匀分布的旋涡状的对流结构,并随时间聚合发展变大。此外还利用定量纹影法考察了传质过程中的浓度分布和界面张力梯度等信息。定量的结果表明较大的界面张力梯度位于对流胞型的边缘和中心处,驱动着界面流体的运动,并耦合浮力效应,形成了近界面环流的运动形式。这种环流运动造成了对流胞型边缘浓度较大、内部浓度小的分布,促进了相界面流体微元的更新,加强了传质过程。

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