Measurement using laser induced fluorescence technique for interfacial convection during water-CO2 absorption process

doi:10.11949/j.issn.0438-1157.20160455

Abstract

Abstract:

An experimental apparatus based on laser induced fluorescence (LIF) technique for measuring interfacial Rayleigh convection in process of water-CO₂ absorption was established. By fluorescein sodium and a calibration process, the correlation between the fluorescent light intensity and the concentration of CO₂ in water was obtained, and thus an LIF method of quantitative measurement of CO₂ concentration in water was established. By established installation and method, the concentration distribution evolution for the Rayleigh convection developed near the surface of water in the water-CO₂ absorption process was investigated. Validation of the measurement results was made by checking with the critical value of Rayleigh number reported in literature. The experimental results were also used to analyze the transition mass transfer regime from molecular diffusion to convective diffusion, and the enhancement effect of the interfacial Rayleigh convection on the mass transfer process.

Key words: water-CO₂ absorption, laser induced fluorescence, interfacial Rayleigh convection, concentration distribution, mass transfer enhancement

摘要：

建立了采用激光诱导荧光技术观测水吸收CO₂过程中界面对流现象的实验装置，利用荧光素钠作为荧光剂，通过标定获得了CO₂在水中溶解浓度与荧光强度的关系，进而获得了定量测量水中CO₂浓度分布的实验方法。通过建立的实验装置和方法，测量了水吸收CO₂过程中液体近界面Rayleigh对流发生时的浓度分布演化过程。利用实验结果对文献中报道的临界Rayleigh数进行了验证；并对上述吸收体系的界面传质由分子扩散主导逐步转变为对流传质主导的过程，以及Rayleigh对流对吸收过程界面传质的强化进行了定量分析。

关键词: 水吸收CO₂, 激光诱导荧光, 界面Rayleigh对流, 浓度分布, 传质增强

CLC Number:

TQ021.4

LI Luxing, HU Nan, YUAN Xigang. Measurement using laser induced fluorescence technique for interfacial convection during water-CO₂ absorption process[J]. CIESC Journal, 2016, 67(10): 4055-4063.

李陆星, 胡楠, 袁希钢. 水吸收CO₂过程界面对流的激光诱导荧光观测[J]. 化工学报, 2016, 67(10): 4055-4063.

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Measurement using laser induced fluorescence technique for interfacial convection during water-CO₂ absorption process

水吸收CO₂过程界面对流的激光诱导荧光观测

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