Visualization and modeling of the hydrodynamics of an impinging microjet

Analytical Chemistry
Eleni BitziouPatrick R Unwin

Abstract

The use of fluorescence confocal laser scanning microscopy (CLSM) for flow visualization is described, with a focus on elucidating the pattern of flow in the microjet electrode (MJE). The MJE employs a nozzle, formed from a fine glass capillary, with an inner diameter of approximately 100 microm, to direct solution at an electrode surface, using high velocity but at moderate volume flow rates. For CLSM visualization, the jetted solution contains a fluorescent probe, fluorescein at high pH, which flows into a solution buffered at low pH, where the fluorescence is extinguished, thereby highlighting the flow field of the impinging microjet. The morphology of the microjet and the hydrodynamic boundary layer are shown to be highly sensitive to the volume flow rate, with a collimated jet and thin boundary layer formed at the faster flow rates (approximately 1 cm(3) min(-1)). In contrast, at lower flow rates and for relatively large substrates, an unusual recirculation zone is observed experimentally for the first time. This effect can be eliminated by employing small substrates. The experimental observations have been quantified through numerical solution of the Navier-Stokes equations of continuity and momentum balance. The new insi...Continue Reading

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Citations

Oct 29, 2008·Chemical Communications : Chem Comm·Barry R Silver, Patrick R Unwin
Jan 24, 2016·Journal of Colloid and Interface Science·Jing JiangLishi Wang
Sep 21, 2016·The Journal of Physical Chemistry Letters·Kim McKelveyHenry S White
May 30, 2019·Physical Chemistry Chemical Physics : PCCP·Mariam FadelJérôme Vicente
May 29, 2015·Veterinary Pathology·M R Hardcastle, K E Dittmer
Mar 25, 2010·Analytical Chemistry·Michael E SnowdenPatrick R Unwin
Jan 29, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Meiqin ZhangPatrick R Unwin
Nov 30, 2007·The Journal of Physical Chemistry. a·Costas A AnastassiouDanny O'Hare

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