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Issue 46, 2013
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Rate of gas absorption on a slippery bubble mattress

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Abstract

We investigate the absorption of a pure gas into a liquid in laminar flow past a superhydrophobic surface consisting of alternating solid walls and micro-bubbles. We experimentally measure and numerically estimate the dynamic mass transfer of gas absorption at stable gas–liquid interfaces for short contacting times. We study the net rate of gas absorption experimentally by in situ measurements of dissolved oxygen concentration profiles in aqueous solutions flowing over oxygen bubbles by fluorescence lifetime imaging microscopy. We numerically analyze the dynamics of interfacial mass transfer of dissolved oxygen by considering (i) kinetic equilibrium conditions at bubble surfaces that are conventionally described by Henry's Law and (ii) non-equilibrium conditions at bubble surfaces using Statistical Rate Theory (SRT). Our experimental results show that kinetic equilibrium is not established for short contact times. Mass transfer of gas into liquid flow past micro-bubbles can be well described by our simulations performed with the non-equilibrium theory for a short exposure time (∼180 μs) of liquid with a microbubble, deviating from the commonly accepted Henry's Law.

Graphical abstract: Rate of gas absorption on a slippery bubble mattress

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Article information


Submitted
15 Jul 2013
Accepted
26 Sep 2013
First published
01 Oct 2013

This article is Open Access

Soft Matter, 2013,9, 11098-11106
Article type
Paper

Rate of gas absorption on a slippery bubble mattress

E. Karatay, P. A. Tsai and R. G. H. Lammertink, Soft Matter, 2013, 9, 11098
DOI: 10.1039/C3SM51928G

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