Journal ArticleDOI
Calibration of electrodiffusion friction probes using a voltage-step transient
TLDR
In this article, a voltage-step transient experiment is used to calibrate electrodiffusion (ED) friction probes in high-speed rotating impellers and the results show that shear rates as high as 106s-1 can be reliably measured using 0.5mm Pt working electrodes in ferro/ferricyanide aqueous solutions.Abstract:
Voltage-step transient experiments are used to calibrate electrodiffusion (ED) friction probes. The approach is demonstrated on the probes in high-speed rotating impellers. This calibration has shown that shear rates as high as 106s-1 can be measured reliably using 0.5mm Pt working electrodes in ferro/ferricyanide aqueous solutions. The complete transient calibration experiment provides sufficient information about the dynamics of ED friction probes.read more
Citations
More filters
Journal ArticleDOI
Current methods for characterising mixing and flow in microchannels
TL;DR: A review of existing methods for the characterisation of mixing and flow in microchannels, micromixers and microreactors can be found in this article, where the authors analyze the current experimental techniques and methods available for characterising mixing and the associated phenomena in single and multiphase flow.
Journal ArticleDOI
Cleaning in place: effect of local wall shear stress variation on bacterial removal from stainless steel equipment
C. Lelièvre,Patrick Legentilhomme,Cécile Gaucher,Jack Legrand,Christine Faille,Thierry Benezech +5 more
TL;DR: In this paper, local wall shear stress analysis as well as cleanability experiments on various pieces of equipment in various circuit arrangements were performed, including straight pipes of different diameters, sudden or gradual contraction or expansion pipes.
Journal ArticleDOI
Distribution of surface shear forces and bubble characteristics in full-scale gas sparged submerged hollow fiber membrane modules
TL;DR: In this paper, the authors studied the shear forces induced by gas sparging in full-scale submerged hollow fiber membrane modules and found that they were highly variable over time and heterogeneously distributed within the system.
Journal ArticleDOI
Influence of viscosity and surface tension on performance of gas–liquid contactors with ejector type gas distributor
TL;DR: In this paper, the effect of the liquid-phase viscosity and surface tension on hydraulic and mass transfer characteristics in a bubble column with an up-flow ejector-type gas distributor was studied.
Journal ArticleDOI
Diffusion coefficients of ferricyanide ions in polymeric solutions — comparison of different experimental methods
TL;DR: In this paper, the diffusion coefficient of ferricyanide ions in polymeric Newtonian and non-Newtonian solution has been studied at 25°C with different experimental methods: rotating-disc flow, Couette-flow and unsteady diffusion.
References
More filters
Journal ArticleDOI
Frequency response of electrochemical sensors to hydrodynamic fluctuations
TL;DR: In this article, the response of mass transfer to a small mass sink to hydrodynamic fluctuations in the concentration boundary layer has been calculated as a function of frequency, and the dimensionless local flux was expressed as a series expansion of the dimensioness local diffusion layer thickness η and as the asymptotic power law in the high frequency range.
Journal ArticleDOI
Simultaneous measurement of film thickness and wall shear stress in wavy flow of non-newtonian liquids
TL;DR: In this article, the authors present a confrontation between the theories de l'ecoulement par gravite d'un fluide newtonien en couches ondulees a surface libre.
Journal ArticleDOI
Shear rates on turbine impeller blades
TL;DR: In this article, the authors measured the shear rates on the front side of a turbine impeller blade by an electrochemical method and found that the values obtained for water, CMC solutions and a kaoline suspension were in general higher than assumed.
Journal ArticleDOI
Study of Taylor-Couette flow using a three-segment electrodiffusion probe
V. Sobolik,B. Benabes,G. Cognet +2 more
TL;DR: In this paper, the axial and azimuthal components of the shear rate on the wall of a pair of concentric cylinders with the inner cylinder rotating were measured using a three-segment electrodiffusion probe.