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

Journal article

Publication Details

Author(s): Hu M, Benning R, Delgado A, Ertunc Ö, Nercissian V, Berger M
Journal: Heat and Mass Transfer
Publication year: 2017
Volume: 53
Journal issue: 12
Pages range: 3409-3420
ISSN: 0947-7411


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 40o C, 50o C and 60o
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.

FAU Authors / FAU Editors

Benning, Rainer Dr.-Ing.
Lehrstuhl für Strömungsmechanik
Delgado, Antonio Prof. Dr.-Ing.
Lehrstuhl für Strömungsmechanik
Ertunc, Özgür Dr.
Lehrstuhl für Strömungsmechanik
Hu, Miao
Lehrstuhl für Strömungsmechanik
Nercissian, Vanusch
Lehrstuhl für Experimentalphysik (Optik)

How to cite

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.

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.


Last updated on 2019-01-07 at 16:53