Modeling of Unidirectional-Overloaded Transition in Catalytic Tubular Microjets

Anke Klingner, Islam S. M. Khalil, Veronika Magdanz, Vladimir M. Fomin, Oliver G. Schmidt, Sarthak Misra

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)

Abstract

A numerical time-resolved model is presented for predicting the transition between unidirectional and overloaded motion of catalytic tubular microjets (Ti/Fe/Pt rolled-up microtubes) in an aqueous solution of hydrogen peroxide. Unidirectional movement is achieved by periodic ejection of gas bubbles from one end, whereas formation of multiple bubbles hinders microjet movement in overloaded regime. The influence of nucleation positions of bubbles, hydrogen peroxide concentration, liquid-platinum contact angle, microjet length, and cone angle on the bubble ejection frequency and microjet speed are investigated. We find agreement between the theoretical speeds of the microjet for a range of bubble nucleation positions (0.4L ≤ x0 ≤ 0.6L) and our measurements (108 ± 35 μm/s) for unidirectional motion. In addition, we observe experimentally that transition to overloaded motion occurs for hydrogen peroxide concentration of 5%, whereas our model predicts this transition for concentrations above 2.5%.
Original languageEnglish
Pages (from-to)14854-14863
Number of pages10
JournalJournal of physical chemistry C
Volume121
Issue number27
DOIs
Publication statusPublished - 13 Jul 2017

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Hydrogen peroxide
Hydrogen Peroxide
bubbles
hydrogen peroxide
Nucleation
ejection
Platinum
Bubbles (in fluids)
Contact angle
Cones
nucleation
Gases
Liquids
cones
platinum
aqueous solutions
liquids
gases

Cite this

Klingner, Anke ; Khalil, Islam S. M. ; Magdanz, Veronika ; Fomin, Vladimir M. ; Schmidt, Oliver G. ; Misra, Sarthak. / Modeling of Unidirectional-Overloaded Transition in Catalytic Tubular Microjets. In: Journal of physical chemistry C. 2017 ; Vol. 121, No. 27. pp. 14854-14863.
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abstract = "A numerical time-resolved model is presented for predicting the transition between unidirectional and overloaded motion of catalytic tubular microjets (Ti/Fe/Pt rolled-up microtubes) in an aqueous solution of hydrogen peroxide. Unidirectional movement is achieved by periodic ejection of gas bubbles from one end, whereas formation of multiple bubbles hinders microjet movement in overloaded regime. The influence of nucleation positions of bubbles, hydrogen peroxide concentration, liquid-platinum contact angle, microjet length, and cone angle on the bubble ejection frequency and microjet speed are investigated. We find agreement between the theoretical speeds of the microjet for a range of bubble nucleation positions (0.4L ≤ x0 ≤ 0.6L) and our measurements (108 ± 35 μm/s) for unidirectional motion. In addition, we observe experimentally that transition to overloaded motion occurs for hydrogen peroxide concentration of 5{\%}, whereas our model predicts this transition for concentrations above 2.5{\%}.",
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Modeling of Unidirectional-Overloaded Transition in Catalytic Tubular Microjets. / Klingner, Anke; Khalil, Islam S. M.; Magdanz, Veronika; Fomin, Vladimir M.; Schmidt, Oliver G.; Misra, Sarthak.

In: Journal of physical chemistry C, Vol. 121, No. 27, 13.07.2017, p. 14854-14863.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - Modeling of Unidirectional-Overloaded Transition in Catalytic Tubular Microjets

AU - Klingner, Anke

AU - Khalil, Islam S. M.

AU - Magdanz, Veronika

AU - Fomin, Vladimir M.

AU - Schmidt, Oliver G.

AU - Misra, Sarthak

PY - 2017/7/13

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AB - A numerical time-resolved model is presented for predicting the transition between unidirectional and overloaded motion of catalytic tubular microjets (Ti/Fe/Pt rolled-up microtubes) in an aqueous solution of hydrogen peroxide. Unidirectional movement is achieved by periodic ejection of gas bubbles from one end, whereas formation of multiple bubbles hinders microjet movement in overloaded regime. The influence of nucleation positions of bubbles, hydrogen peroxide concentration, liquid-platinum contact angle, microjet length, and cone angle on the bubble ejection frequency and microjet speed are investigated. We find agreement between the theoretical speeds of the microjet for a range of bubble nucleation positions (0.4L ≤ x0 ≤ 0.6L) and our measurements (108 ± 35 μm/s) for unidirectional motion. In addition, we observe experimentally that transition to overloaded motion occurs for hydrogen peroxide concentration of 5%, whereas our model predicts this transition for concentrations above 2.5%.

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