Turbulent mass transfer on a rotating disk

Hanna, Owen T.; Sandall, Orville C.; Ruiz-Ibanez, Gabriel

doi:10.1016/0009-2509(88)85114-5

Cited by 7 publications

(5 citation statements)

References 16 publications

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“…27 Besides, turbulence first occurs near the rim of the disk, the liquid flow at a small disk radius is then still laminar. 28 In the transition regime, the observed power in Re is 3.0, which describes the transition from laminar to turbulent flow and is thus not a fundamental property of the mass transfer mechanism, as is the value of 0.5 in laminar flow and the value of 0.9 in turbulent flow.…”

Section: Resultsmentioning

confidence: 99%

Liquid−Solid Mass Transfer and Reaction in a Rotor−Stator Spinning Disc Reactor

Meeuwse

Lempers

Schaaf

et al. 2010

Ind. Eng. Chem. Res.

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The heterogeneously catalyzed oxidation of glucose is performed in a rotor−stator spinning disk reactor. One side of the rotor is coated with a Pt/C and Nafion catalytic layer, resulting in a liquid−solid interfacial area of 274 mi 2 mR −3. At the lowest rotational disk speed, 26 rad s−1, the reaction is liquid−solid mass transfer limited; at the highest rotational disk speed, 180 rad s−1, the intrinsic kinetics are rate determining. The experimental overall reaction rates are fitted with a resistances in series model, with the activation energy, pre-exponential factor, and volumetric liquid−solid mass transfer coefficient as parameters. The volumetric liquid−solid mass transfer coefficient, k LS a LS, increases from 0.02 to 0.22 mL 3 mR −3 s−1 for a rotational disk speed of 26 to 157 rad s−1. These values are high in comparison to conventional reactors, like packed beds, in spite of the low liquid−solid interfacial area used in this study. The values of the liquid−solid mass transfer coefficient k LS are 1 order of magnitude higher compared to values reported for packed beds. The Sherwood number for the liquid−solid mass transfer in the rotor−stator spinning disk reactor depends on the Reynolds number to the power 2 in the range 1 × 105 < Re < 7 × 105. In this range, the transition of laminar flow to turbulent flow takes place, resulting in a change of the mass transfer mechanism.

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Section: Resultsmentioning

confidence: 99%

Liquid−Solid Mass Transfer and Reaction in a Rotor−Stator Spinning Disc Reactor

Meeuwse

Lempers

Schaaf

et al. 2010

Ind. Eng. Chem. Res.

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“…For example, for wall-jet hydrodynamic electrodes [18] the transition to turbulent flow has been expressed in terms of the critical Reynolds number with 25 < Recritical < 1000 (with Re = where U is the velocity in ms -1 , l is the nozzle diameter in m, and v is the kinematic viscosity in m 2 s -1 ). Similarly, for the rotating disc electrode under high speed conditions [19] the transition to turbulent conditions is expected at Recritical = 3 × 10 5 [20,21]…”

Section: Discussionmentioning

confidence: 93%

Hydrodynamic Voltammetry at a Rocking Disc Electrode: Theory versus Experiment

Ahn

Somasundaram

Nguyen

et al. 2016

Electrochimica Acta

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Rocking disc electrode voltammetry (RoDE) is introduced as an experimentally convenient and versatile alternative to rotating disc voltammetry. A 1.6 mm diameter disc electrode is employed with an overall rocking angle of Θ = 90 degree applied over a frequency range of 0.83 Hz to 25 Hz. For a set of known aqueous redox systems (the oxidation of Fe(CN)6 4in 1 M KCl, the reduction of Ru(NH3)6 3+ in 0.1 M KCl, the oxidation of hydroquinone in 0.1 M pH 7 phosphate buffer, the oxidation of Iin 0.125 M H2SO4, and the reduction of H + in 1 M KCl)

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“…Next, the Reynolds number was calculated to see if the high-speed rotating disk electrode operated under laminar or turbulent conditions, noting that eqs 1 and 2 presume laminar conditions. The Reynolds number was estimated via the following: The critical Reynolds number separating laminar from turbulent flow has been described as being Re c = 3 × 10 5 . , Using eq 3, the Reynolds number was found to be 658 (±32), which is below the Re c number, confirming that the HSRDE operates under a laminar flow regime.…”

Section: Resultsmentioning

confidence: 99%

Hydrodynamic Electrochemistry: Design for a High-Speed Rotating Disk Electrode

et al. 2005

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We report a novel gas-driven high-speed rotating disk electrode (HSRDE). The HSRDE when immersed in an aqueous solution rotates at approximately 650 Hz, generating laminar flow resulting in a diffusion layer, under steady-state conditions, of thickness approximately 2 microm. The use of high-pressure gas to drive the rotator offers significant improvement in electrical noise as compared to conventional mechanically driven devices. The electroanalytical utility of the HSRDE was exemplified by the anodic stripping voltammetry of arsenic(III) at a gold working electrode. The charge under the arsenic stripping peak was found to increase by more than 1 order of magnitude under the enhanced mass transport regime at the HSRDE in comparison to that seen under quiescent conditions.

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Turbulent mass transfer on a rotating disk

Cited by 7 publications

References 16 publications

Liquid−Solid Mass Transfer and Reaction in a Rotor−Stator Spinning Disc Reactor

Liquid−Solid Mass Transfer and Reaction in a Rotor−Stator Spinning Disc Reactor

Hydrodynamic Voltammetry at a Rocking Disc Electrode: Theory versus Experiment

Hydrodynamic Electrochemistry: Design for a High-Speed Rotating Disk Electrode

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