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Dynamical mass‐transfer process of a CO 2 bubble measured by using LIF/HPTS visualisation and photoelectric probing
Author(s) -
Hanyu Kodai,
Saito Takayuki
Publication year - 2010
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.20319
Subject(s) - wake , bubble , mass transfer , particle image velocimetry , analytical chemistry (journal) , buoyancy , chemistry , advection , mechanics , physics , thermodynamics , turbulence , chromatography
We directly visualised the dynamical mass‐transfer process from a zigzagging rising CO 2 bubble (2.9 mm in equivalent diameter) to its surrounding liquid by using laser‐induced fluorescence/8‐hydroxypyrene‐1, 3, 6‐trisulfonic acid (LIF/HPTS). We measured the surrounding liquid motion induced by bubble buoyancy using particle image velocimetry (PIV). Further, the CO 2 concentration profile inside the bubble wake was measured directly by using a newly developed photoelectric optical fibre probe (POFP). Making the best and mutually complementary use of these three measurement techniques, we discuss the relationship between the mass‐transfer process and the flow structure. We succeeded in clearly visualising CO 2 ‐rich regions corresponding with the dynamical mass‐transfer process from the bubble to the wake and the surrounding liquid (LIF/HPTS). We also obtained a CO 2 concentration profile in the bubble wake (the POFP). It was found that the CO 2 ‐rich regions were formed into horseshoe‐like vortices; the CO 2 concentration at the centre region of the wake was the highest, and the concentration decreased toward the outer edge of the wake; the CO 2 ‐rich regions were transported widely into the surrounding liquid by the advective liquid‐phase flows (PIV). In addition, we discuss the performance and characteristics of the newly developed POFP.