A colorimetric method for quantitative visualization of diffusion and internal circulation in liquid–liquid two-phase flow

Autor:	Tomohiko Kihara, Shogo Tsuzaki, Hideaki Obata, Hiroyuki Hirano
Rok vydání:	2022
Předmět:	Materials science Microchannel Aqueous solution Cyclohexane Applied Mathematics General Chemical Engineering Diffusion Analytical chemistry General Chemistry Industrial and Manufacturing Engineering chemistry.chemical_compound chemistry Distilled water pH indicator Calibration Two-phase flow
Zdroj:	Chemical Engineering Science. 249:117285
ISSN:	0009-2509
DOI:	10.1016/j.ces.2021.117285
Popis:	Herein, we propose a new method for the quantitative evaluation of mass-transfer characteristics in liquid–liquid two-phase flow during the formation of slug and its progression in a microchannel. The experimental setup included a 0.3-mm square microchannel with a Y junction. Distilled water with pH indicator and cyclohexane containing acetic acid were selected as the probe fluids. The acetic-acid concentrations were 0.05 and 0.1 vol.%, while the volumetric velocity of the aqueous and organic phases was 0.03 mL/min. Acetic-acid diffusion and its internal circulation in the aqueous slug were visualized by color changes and recorded as microscopically magnified video images. By adopting a deep-learning algorithm, the aqueous slugs were segmented, and a calibration method converted color information to acetic-acid concentration values. The experimental results were comparable with those of previous studies. The presented method also revealed several new features that could not have been observed quantitatively by established experimental methods.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c9e10e7b7281d0840075312d2ef48c8f https://doi.org/10.1016/j.ces.2021.117285 Zobrazit plný text záznamu Full Text from ScienceDirect