Diffusion coefficients of ferricyanide ions in polymeric solutions — comparison of different experimental methods

Legrand, Jack; Dumont, Éric; Comiti, Jacques; Fayolle, Francine

doi:10.1016/s0013-4686(99)00391-6

Cited by 47 publications

(43 citation statements)

References 13 publications

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“…Taking into account this fact the basic measurements were performed in the following solution: 0.005 (kmol m À3 ) Table 1. The values of diffusivity coefficients were taken from [36][37][38]. It has been shown that the value of limiting diffusion current is constant in the whole range of angular coordinates u 2 hÀ43°; 43°i tested, confirmed by measurements for Newtonian fluids.…”

Section: Distribution Of Hydrodynamic and Heat Transfer Coefficients mentioning

confidence: 80%

Determination of the flow and heat transfer characteristics in non-Newtonian media agitated using the electrochemical technique

Broniarz-Press

Różańska

2008

International Journal of Heat and Mass Transfer

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Section: Distribution Of Hydrodynamic and Heat Transfer Coefficients mentioning

confidence: 80%

Determination of the flow and heat transfer characteristics in non-Newtonian media agitated using the electrochemical technique

Broniarz-Press

Różańska

2008

International Journal of Heat and Mass Transfer

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“…More sophisticated electrochemical procedures such as methods based on rotation disc measurements [4], on transient chronoamperometric data collected after voltage step [5], Couette-flow cell [6] experiments, etc. are applicable for diffusion coefficient determinations with conventional size electrode.…”

Section: Introductionmentioning

confidence: 99%

“…The position of the microdispenser was set with high precision. Measurements were done with K 4 [Fe(CN) 6 ] and with ferrocene and its derivatives. A home-made, quite complicated apparatus was needed to perform the experiments.…”

Section: Introductionmentioning

confidence: 99%

Determination of diffusion coefficient in gel and in aqueous solutions using scanning electrochemical microscopy

Csóka¹,

Nagy

2004

Journal of Biochemical and Biophysical Methods

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“…The physical properties of CMC electrolyte are summarised in Table 1. The determination of the diffusion coefficients of the ferricyanide ions, D, in these polymeric solutions is described in Legrand et al [19].…”

Section: Characteristics Of the Electrolytesmentioning

confidence: 99%

Determination of heterogeneities in a scraped surface heat exchanger using electrochemical sensors

2005

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An experimental investigation of a scaled-down model of an industrial exchanger, using an electrochemical technique, was undertaken in order to show the presence of hydrodynamic heterogeneities at low axial Reynolds number. Heterogeneities were revealed in the bowls with respect to the generalised Taylor number as the result of the perturbations added to the flow by blade rotation at both ends of the exchanger. Shear heterogeneities associated to flow visualisations were correlated to temperature heterogeneities observed in the bowls. Shear fluctuations were revealed in the scraped part describing two distinctive zones at low rotation speed caused by varying viscosity in the flow field. A complex spiral flow was observed by flow visualisation characterising a mass transfer evolution comprised between these two distinctive zones at low Taylor number.of the microelectrode (m) d h hydraulic diameter (m) d h = (d s -d r ) d r rotor diameter (m) d s stator diameter (m) e gap (m) F Faraday constant (A s mol )1 ) K consistency coefficient of the product (Ostwald law (Pa s n )) L stator length (m) n flow behaviour index of the product (Ostwald law (-)) N rotation speed (rps) n L number of blades (-) Q flow rate (m 3 s )1 ) Re ax ¼ &U d d h axial Reynolds number (-) Re axg ¼ &U 2Àn d d n d K generalised axial Reynolds number (-) Re r ¼ &Nd 2 r Rotational Reynolds number (-) R r rotor radius (m) R s stator radius (m) S wall shear rate (s )1 ) Sc exchange surface (m 2 ) T temperature (°C) Ta ¼ ffiffiffiffiffiffiffiffiffiffi R s ÀR r R r q &d h 2 ðR r Þ Taylor number (-) Ta g ¼ ffiffiffiffiffiffiffiffiffiffi R s ÀR r R r q &d n h 2 n ðR r Þ 2Àn K generalised Taylor number (-) Ta c , Ta gc critical values of Taylor number (-) U d mean axial velocity in the annular space (m s )1 ) z number of electrons (-) q density (kg m )3 ) g dynamic viscosity (Pa s) cshear rate (s )1 ) X rotating speed of the rotor (rad. s )1 ); X = 2pN s shear stress (Pa)

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Diffusion coefficients of ferricyanide ions in polymeric solutions — comparison of different experimental methods

Cited by 47 publications

References 13 publications

Determination of the flow and heat transfer characteristics in non-Newtonian media agitated using the electrochemical technique

Determination of the flow and heat transfer characteristics in non-Newtonian media agitated using the electrochemical technique

Determination of diffusion coefficient in gel and in aqueous solutions using scanning electrochemical microscopy

Determination of heterogeneities in a scraped surface heat exchanger using electrochemical sensors

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