Direct spatiotemporally resolved fluorescence investigations of gas absorption and desorption in liquid film flows

作者：Kapoustina Viktoria^*; Ross Jones Jesse; Hitschler Michael; Raedle Matthias; Repke Jens Uwe

来源：Chemical Engineering Research and Design, 2015, 99: 248-255.

DOI：10.1016/j.cherd.2015.03.024

• Planar Laser Induced Fluorescence
• Diffusion
• Mass transfer
• Liquid film flow
• Absorption
• Desorption

An optical measuring technique, combining Planar Laser Induced Fluorescence (PLIF) with the effect of fluorescence quenching, is used for the local concentration analysis of a gas absorbed and desorbed in a thin liquid film flow. The absorption and desorption process is visualized by using oxygen in a mixture of water, ethanol and glycerol. Fluorescence is strongly reduced by the presence of molecular oxygen as a result of dynamic quenching. The resulting decrease in intensity is detected and interpreted through image processing. The image analysis provides a spatiotemporal value of fluorescence intensity and therefore enables the direct characterization of local transport phenomena in the liquid film flow. In this way, the impact of a single pyramidal microstructure on mass transfer into the film flow is examined. The results are compared to liquid film flow over a smooth surface. The measuring methodology is validated through diffusion experiments.

• 出版日期2015-7
• 单位中国矿业大学（北京）