Characterization of slug flow of two aqueous phases by electrochemical impedance spectroscopy in a fluidic chip
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F18%3A43915898" target="_blank" >RIV/60461373:22340/18:43915898 - isvavai.cz</a>
Alternative codes found
RIV/49777513:23640/18:43964124
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0167931718301138?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0167931718301138?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.mee.2018.03.003" target="_blank" >10.1016/j.mee.2018.03.003</a>
Alternative languages
Result language
angličtina
Original language name
Characterization of slug flow of two aqueous phases by electrochemical impedance spectroscopy in a fluidic chip
Original language description
We adopted a method of electrochemical impedance spectroscopy (EIS) for the characterization of slug flow of two immiscible aqueous phases in a flow channel. The impedance response (both magnitude and phase shift) of the two-phase system is measured as a function of time at selected frequencies. The presence of slugs or a continuous phase at a pair of parallel facing electrodes can be determined under various signal frequencies mainly due to a significant difference in the electrolytic conductivities of both phases. We found that EIS data are sensitive to the total flowrate at low signal frequencies. Further, we suggested an equivalent electric circuit that takes into account all capacitances and resistances emerging between the two sensing electrodes. We determined the values of these elements by fitting a theoretical model to the experimental data. The obtained values of resistances were used to estimate the thicknesses of the wall film of the continuous phase that is present between a slug of the dispersed fluid and a channel wall. The estimates given by the EIS method were successfully verified by microscopic observation and an available hydrodynamic correlation. The developed EIS method represents an original approach to the estimation of wall film thickness applicable to the efficient control of various droplet-based microfluidic devices such as microreactors and microextractors working with aqueous two-phase systems.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20402 - Chemical process engineering
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Microelectronic Engineering
ISSN
0167-9317
e-ISSN
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Volume of the periodical
194
Issue of the periodical within the volume
July
Country of publishing house
US - UNITED STATES
Number of pages
7
Pages from-to
89-95
UT code for WoS article
000433265900016
EID of the result in the Scopus database
2-s2.0-85044131761