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Visualization and Modeling of the hydrodynamics of an impinging microjet
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UNSPECIFIED (2006) Visualization and Modeling of the hydrodynamics of an impinging microjet. ANALYTICAL CHEMISTRY, 78 (5). pp. 1435-1443. doi:10.1021/ac051692i ISSN 0003-2700.
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Official URL: http://dx.doi.org/10.1021/ac051692i
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 (WE). The MJE employs a nozzle, formed from a fine glass capillary, with an inner diameter of similar to 100 mu m, 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 (similar to 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 insights provided by CLSM imaging demonstrate that flow in the MJE, and impinging jets in general, are more complex than predicted by classical models but are well-defined and quantifiable.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry | ||||
Journal or Publication Title: | ANALYTICAL CHEMISTRY | ||||
Publisher: | AMER CHEMICAL SOC | ||||
ISSN: | 0003-2700 | ||||
Official Date: | 1 March 2006 | ||||
Dates: |
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Volume: | 78 | ||||
Number: | 5 | ||||
Number of Pages: | 9 | ||||
Page Range: | pp. 1435-1443 | ||||
DOI: | 10.1021/ac051692i | ||||
Publication Status: | Published |
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