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Simultaneous in situ characterisation of bubble dynamics and a spatially resolved concentration profile : A combined Mach-Zehnder holography and confocal Raman-spectroscopy sensor system

Guhathakurta, Jajnabalkya; Schurr, Daniela; Rinke, Günter; Dittmeyer, Roland; Simon, Sven

Abstract:
For a reaction between a gaseous phase and a liquid phase, the interaction between the hydrodynamic conditions, mass transport and reaction kinetics plays a crucial role with respect to the conversion and selectivity of the process. Within this work, a sensor system was developed to simultaneously characterise the bubble dynamics and the localised concentration measurement around the bubbles. The sensor system is a combination of a digital Mach-Zehnder holography subsystem to measure bubble dynamics and a confocal Raman-spectroscopy subsystem to measure localised concentration. The combined system was used to investigate the chemical absorption of CO₂ bubbles in caustic soda in microchannels. The proposed set-up is explained and characterised in detail and the experimental results are presented, illustrating the capability of the sensor system to simultaneously measure the localised concentration of the carbonate ion with a good limit of detection and the 3-D position of the bubble with respect to the spot where the concentration was measured.


Zugehörige Institution(en) am KIT Institut für Mikroverfahrenstechnik (IMVT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator DOI: 10.5194/jsss-6-223-2017
ISSN: 2194-8771, 2194-878X
URN: urn:nbn:de:swb:90-708201
KITopen ID: 1000070820
Erschienen in Journal of sensors and sensor systems
Band 6
Heft 1
Seiten 223-236
Lizenz CC BY 3.0 DE: Creative Commons Namensnennung 3.0 Deutschland
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