Near-wall turbulence in drag reducing flows investigated by the photolithography-electrochemical probes

Deslouis, C.; Tribollet, Bernard; Tihon, J.

doi:10.1016/j.jnnfm.2004.07.016

Cited by 18 publications

(11 citation statements)

References 23 publications

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“…Using modern microfilm technologies [8,13], it is possible to fabricate sensors with extremely small working electrodes. Hence, it is interesting to estimate the minimum distance l min between the generator and the detector electrodes that is admissible for the delay-time method.…”

Section: Accuracy and Limitations Of The Delay-time Methodsmentioning

confidence: 99%

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Electrodiffusion diagnostics of laminar flows using the delay-time method

2007

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Electrodiffusion diagnostics are widely used for measurement of local wall shear stresses in liquid flows. At present, this method requires special electrolytes, so the applications are limited to laboratory conditions. Another problem concerns the dependence of the limiting diffusion current on the electrode surface state and on the bulk concentration of the electroactive species. In this paper, it is shown that the delay time between generation of the electroactive species and their detection on the downstream electrode, is directly related to the local wall shear stress value. Thus, the measurements of the delay-time open a new way for the study of near-wall hydrodynamics. This new method has been confirmed experimentally using an electrolyte containing the conventional hexacyanoferrate(III/II) redox couple, as well as with the chlorine (chloric(I))/ chloride couple in an electrolyte similar to seawater.

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Section: Accuracy and Limitations Of The Delay-time Methodsmentioning

confidence: 99%

“…The electrochemical (electrodiffusion) diagnostics of flows are widely used for the measurements of the wall velocity gradient and the local wall shear stress s w in electrolyte solutions [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. This method is based on the measurement of the limiting diffusion current I on small flush-mounted electrodes.…”

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confidence: 99%

Electrodiffusion diagnostics of laminar flows using the delay-time method

2007

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“…A sequence of fabrication steps, including photoresist removal, electrodeposition, casting and etching, then complete the process of microelectrode fabrication. An array of gold microelectrodes on a silicon wafer prepared for a near-wall turbulence study [3] is shown in Figure 3. There are two masks levels applied: the first one corresponds to the overall design including both the active areas and the paths for the current to the measuring device.…”

Section: Sensor Fabrication Based On Photolithographymentioning

confidence: 99%

“…This is important especially in the preparation of sensors for the investigation of near-wall turbulence structures. This is reason why the probably first electrodiffusion experiment done with photolithography-made sensors has been focused on the drag reduction phenomenon [3]. An array of gold double semi-circular microsensors shown in Figure 3 elucidates the effect of addition of high molecular polymers on the character of turbulent vortices located in the near-wall region.…”

Section: Near-wall Flow Turbulencementioning

confidence: 99%

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Application of the electrodiffusion method for near-wall flow diagnostics

Tihon

2014

EPJ Web of Conferences

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Abstract. The electrodiffusion method is presented as a measuring technique suitable for the flow measurement done in close proximity of the wall, thus in the region difficultly accessible by standard anemometric techniques (e.g. PIV, LDA). The experimental results obtained in different flow configurations (backward-facing step flow, wavy film flow, turbulent channel flow, rising Taylor bubbles) document application capabilities of this technique, e.g. for mapping of wall shear stresses, delimitation of stable flowrecirculation zones, detection of short-time reversal of the near-wall flow, investigation of the near-wall turbulence, or detection of moving fluid particles. A new technology of sensor fabrication based on photolithography is introduced and possible applications of microsensors in microfluidic devices discussed.

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Electrochemical Methods for the Study of Wall Transfer Phenomena

2024

Some Complex Phenomena in Fluid and Solid Mechanics

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Near-wall turbulence in drag reducing flows investigated by the photolithography-electrochemical probes

Cited by 18 publications

References 23 publications

Electrodiffusion diagnostics of laminar flows using the delay-time method

Electrodiffusion diagnostics of laminar flows using the delay-time method

Application of the electrodiffusion method for near-wall flow diagnostics

Electrochemical Methods for the Study of Wall Transfer Phenomena

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