Oxygen as a tracer for measurements of steady and turbulent flows

Deslouis, C.; Gil, O.; Tribollet, Bernard; Vlachos, G. D.; Robertson, Baldwin

doi:10.1007/bf01023727

Cited by 18 publications

(3 citation statements)

References 11 publications

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“…However, it is smaller, which shows a higher diffusion coefficient of oxygen, in agreement with the general increase of the diffusion coefficient of oxygen for more concentrated solutions. 29 For seawater, the diffusion time constant is lower than for the other qualities of water. This feature was certainly due to the porous morphology of the deposit, which is totally different from the more compact scale layer found in scaling water without magnesium.…”

Section: Resultsmentioning

confidence: 99%

Influence of Water Composition and Substrate on Electrochemical Scaling

Jaouhari

Ben-Bachir²,

Guenbour³

et al. 2000

J. Electrochem. Soc.

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Scaling of gold, bronze, and stainless steel was investigated in synthetic fresh and seawater. It is shown that the calcium carbonate precipitation rate increased from stainless steel, to bronze and then to gold whatever the composition of the scaling water. The morphology of the deposited scale depended on the substrate and on its surface state. For fast scaling, as with 200 mg dm Ϫ3 Ca 2ϩ carbonically pure water, calcite was mainly deposited; for slower scaling vaterite was also observed. When foreign ions were added in the scaling water, aragonite appeared. In particular, for synthetic seawater, where magnesium ions are highly concentrated, aragonite is preferentially selected, so at the end of scaling aragonite covered the whole electrode surface. The kinetic parameters, which characterize a precipitation model, were extracted from impedance measurements through a fitting procedure. The morphology of the precipitated calcium carbonate was examined by means of a scanning electron microscope.

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Section: Resultsmentioning

confidence: 99%

Influence of Water Composition and Substrate on Electrochemical Scaling

Jaouhari

Ben-Bachir²,

Guenbour³

et al. 2000

J. Electrochem. Soc.

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“…Impedance spectroscopy in electrochemistry is not restricted to correlation of current and potential: other physical variables have successfully used such as pulsation of velocity in electrohydrodynamic impedance [32], or the sine weight fluctuations monitored by a quartz balance upon potential modulation [33]. Moreover, it has recently been suggested to extend dynamic diagnostics in cells with gaseous reactants or products to the pressure at the cell outlet.…”

Section: Electrochemical Impedance Spectroscopy (Eis) For Mass Transfer Phenomena In Pemfcmentioning

confidence: 99%

Electrochemical pressure impedance spectroscopy for investigation of mass transfer in polymer electrolyte membrane fuel cells

Shirsath

Raël

Bonnet

et al. 2020

Current Opinion in Electrochemistry

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Mass transfer phenomena in membrane fuel cells are complex and diversified, because of the presence of complex transport pathways including porous media of very different pore sizes, and possible formation of liquid water. Electrochemical impedance spectroscopy, although allowing valuable information on ohmic, charge and mass transfer phenomena, may nevertheless appear insufficient below 1 Hz. Use of another variable i.e. back pressure as excitation variable for electrochemical pressure impedance spectroscopy is shown here a promising tool for investigations and diagnosis of fuel cells.

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“…For this purpose, other physical variables have successfully been used e.g. pulsation of velocity in electrohydrodynamic impedance [11] or the sine weight fluctuations monitored by a quartz balance upon potential modulation [12], or the back-pressure of an electrochemical cell as the oscillating excitation variable [13,14]. This last technique, called electrochemical pressure impedance spectroscopy (EPIS), was shown to be promising in complement to regular EIS [15,16] for better understanding of transport phenomena in electrochemical cells involving the presence of gases.…”

Section: -Introductionmentioning

confidence: 99%