Study of mass transfer in supercritical carbon dioxide (SCCO2) using optical methods

Hu M, Benning R, Delgado A, Ertunc Ö, Nercissian V, Berger M (2017)

Publication Type: Journal article

Publication year: 2017

Journal

Heat and Mass Transfer Springer Verlag (Germany)

Book Volume: 53

Pages Range: 3409-3420

Journal Issue: 12

DOI: 10.1007/s00231-017-2075-7

Abstract

The purpose of this work is to design and develop a type of experiment setup that would enable the direct observation of steady diffusion process in situ. Two different optical methods - shadowgraph and shearing interferometry - were used for the first time to visualise and quantitatively analyse the diffusion around a droplet of organic substance in supercritical carbon dioxide (SCCO₂) as well as in its direct vicinity. We constructed and tested a cylindrical high-pressure chamber and an experiment system with a high speed camera. The solute/solvent combination of DL-α-tocopherol/SCCO₂ was applied using shadowgraph. The diffusion coefficients at temperatures of 40^o C, 50^o C and 60^o C and pressures between 75 bar and 90 bar were calculated based on the displacement of the droplet contour in the captured images. The shearing interferometry with a Wollaston-prism was then applied not only for the combination of DL-α-tocopherol/SCCO₂, but also for other substances in SCCO₂, for example for a type of rose oil and lubricant oil as well as for acetone, benzene, toluene and naphthalene. The changes of the refractive index gradient were directly measured and evaluated with the interferograms; afterwards changes of the density gradients and the diffusion coefficients were determined. We propose then a multivariate regression model to capture the relationship between the diffusion coefficient, the pressure and the temperature. To minimize the influence of gravity-driven convections in the solvent during diffusion, the experiments were also carried out under microgravity condition, i.e. in two parabolic flight campaigns.

Authors with CRIS profile

Miao Hu Lehrstuhl für Strömungsmechanik Rainer Benning Lehrstuhl für Strömungsmechanik Antonio Delgado Lehrstuhl für Strömungsmechanik Özgür Ertunc Lehrstuhl für Strömungsmechanik Vanusch Nercissian Lehrstuhl für Experimentalphysik (Optik)

How to cite

APA:

Hu, M., Benning, R., Delgado, A., Ertunc, Ö., Nercissian, V., & Berger, M. (2017). Study of mass transfer in supercritical carbon dioxide (SCCO2) using optical methods. Heat and Mass Transfer, 53(12), 3409-3420. https://doi.org/10.1007/s00231-017-2075-7

MLA:

Hu, Miao, et al. "Study of mass transfer in supercritical carbon dioxide (SCCO2) using optical methods." Heat and Mass Transfer 53.12 (2017): 3409-3420.

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