Autocalibration of electrodiffusion friction probes in microdispersion liquids

Wein, O.

doi:10.1016/j.ijheatmasstransfer.2010.01.001

Cited by 2 publications

(3 citation statements)

References 16 publications

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“…Potassium is commonly used for this purpose. The use of potassium sulfate has the additional beneficial effect that it can also suppress the solubility of oxygen in the solution 46, and it is therefore generally used in cases of long usage of the solution to ensure that no side reactions with oxygen occur. It is worth mentioning that this – in most cases unwanted – side reaction of oxygen has also been used to measure shear stress.…”

Section: Electrodiffusion Method: Theorymentioning

confidence: 99%

“…The Cottrell coefficient can be estimated by applying a voltage step and measuring the current through the electrical system over time 24, 46. The characteristic time of the system, which is the time it takes for the current from an applied voltage step (Eq.…”

Section: Electrodiffusion Method: Theorymentioning

confidence: 99%

“…With increasing computational potential, modeling in this field is still a recent topic and new developments can be expected (see, e.g., 46, 65).…”

Section: Electrodiffusion Method: Theorymentioning

confidence: 99%

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Application of the Electrodiffusion Method to Measure Wall Shear Stress: Integrating Theory and Practice

et al. 2014

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The electrodiffusion method has been used in fluid dynamic research for the past 50 years. It allows the measurement of wall shear stress, a crucial parameter, e.g., for the cleaning of membrane modules used in water filtration. Various authors have published articles dealing with the theory behind this technique. But no paper collects all the knowledge assembled over five decades of application. Here, comprehensive summary of the theory of steady flow, unsteady flow, and transient voltage step experiments is given. Factors influencing the accuracy of the measurements are discussed. Furthermore, a new approach to calibrate the system from voltage step experiments is introduced, and practical issues related to its application in flow measurements are discussed for an exemplary signal response to a near‐wall flow.

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Section: Electrodiffusion Method: Theorymentioning

confidence: 99%

Section: Electrodiffusion Method: Theorymentioning

confidence: 99%

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Application of the Electrodiffusion Method to Measure Wall Shear Stress: Integrating Theory and Practice

et al. 2014

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Diagnostics of Apparent Wall Slip in Aqueous Polymer Solutions

Wein¹,

Tovcigrecko²,

Sobolı́k³

et al. 2009

AIP Conference Proceedings

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Articles you may be interested inSliding plate rheometer studies of concentrated polystyrene solutions: Nonlinear viscoelasticity and wall slip of two high molecular weight polymers in tricresyl phosphate Abstract. Two experimental methods, apparent-wall-slip (AWS) rotational viscometry with "Morse-taper" sensors and electrodiffusion (ED) flow diagnostics with auto-calibrated friction probes, are used to study velocity profiles in aqueous solutions of high-molecular polysaccharides. By comparing the velocity data from the both methods, estimates are obtained of depleted layer thickness in dependence on wall shear stress. Keywords: Apparent wall slip (AWS), Electrodiffusion diagnostics (ED) of flow, Depleted layer thickness. PACS: 83.50.RpFIGURE 10. Edge effects on transient currents. Transient currents at given flow display strong deviations from DLA theory at low H (small probes). RESULTSThe ED transients for each sample were measured at given N J simultaneously for the all 4 pairs of ED probes. The resulting {D, k L } data are converted according to Eq. 5 onto the points on velocity profile v(z) inside the diffusion layer and compared with the linear AWS extrapolation,

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Autocalibration of electrodiffusion friction probes in microdispersion liquids

Cited by 2 publications

References 16 publications

Application of the Electrodiffusion Method to Measure Wall Shear Stress: Integrating Theory and Practice

Application of the Electrodiffusion Method to Measure Wall Shear Stress: Integrating Theory and Practice

Diagnostics of Apparent Wall Slip in Aqueous Polymer Solutions

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