Mass‐transfer effects of bubble streams rising near vertical electrodes

Whitney, Gina M.; Tobias, Charles W.

doi:10.1002/aic.690341207

Cited by 43 publications

(44 citation statements)

References 26 publications

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“…Whitney and Tobias [143] used the MME to study the effect of single columns of electrolytically-generated gas bubbles on the mass transport to a vertically-oriented electrode. They found that a distinction could be made between bubbles generated on the MME itself, at a satellite segment, and bubbles evolved from a wire a some distance from the micro-mosaic surface.…”

Section: Mass-transfer Studies With a Micro-mosaic Electrodementioning

confidence: 99%

“…This is equivalent to a Reynolds number of 6700 [143]. Enhancement occurs because bubbles generated on an electrode rise inside of the diffusion boundary layer.…”

Section: Introductionmentioning

confidence: 99%

“…More recently, Bon, Cettou, Dees [132], Dukovic, Elliott, Putt, Sides, and Whitney [142,143] examined various issues concerning bubble nucleation, coalescence, and bubble-induced enhancements in mass transport. The reader is referred to their individual theses for specific details [127][128][129][130][131][132][133][134][135][136][137][138][139][140][141], and to review articles by Vogt and Sides for a broader introduction to the field of electrolytic gas evolution [ 164,166].…”

Section: Introductionmentioning

confidence: 99%

“…By using a micro-mosaic electrode array (MIME), which has a characteristic segment length similar in size to the bubble diameter, one is able to measure local mass-transfer coefficients. Dees [130], who designed the original MME, observed the effect on mass-transport of the detachment and coalescence of bubbles on a horizontal MME, while Whitney [143] examined the effect of an isolated bubble column rising along a vertical MME. In the present work, new, corrosion-resistant MME electrodes are used, equipped with multiple satellite segments for the formation of parallel gas columns.…”

Section: Introductionmentioning

confidence: 99%

“…A micrometer, which is not shown, controls the position of a separate platinum wire. The wire is positioned at a distance of 300 -800 microns from the electrode surface, and can be used to generate a single column of hydrogen gas bubbles [ 143]. The redesigned MME has satellite segments from where hydrogen can be evolved.…”

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confidence: 99%

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Micro-scale mass-transfer variations during electrodeposition

Sutija¹

1991

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Section: Mass-transfer Studies With a Micro-mosaic Electrodementioning

confidence: 99%

“…This is equivalent to a Reynolds number of 6700 [143]. Enhancement occurs because bubbles generated on an electrode rise inside of the diffusion boundary layer.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Micro-scale mass-transfer variations during electrodeposition

Sutija¹

1991

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Electrochemical Reactors

Vogt¹,

Kreysa²

2008

Ullmann's Encyclopedia of Industrial Chemistry

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The article contains sections titled: 1. Reactors with Gas‐Evolving Electrodes 1.1. Effects of Gas Evolution on Cell Operation 1.2. Bubble Nucleation, Growth, and Detachment 1.3. Bubble Coverage 1.4. Product Release 1.5. Ohmic Resistance of the Interelectrode Gap 1.6. Mass Transfer at Gas‐Evolving Electrodes 1.7. Heat Transfer 1.8. Overpotential of Gas‐Evolving Electrodes 1.9. Limiting Current Density at Gas‐Evolving Electrodes 1.10. Electrodes 1.11. Gas‐Lift Systems 2. Reactors with Superficial Electrodes 3. Reactors with Three‐Dimensional Electrodes 4. Special Reactor Designs The operating modes of electrochemical reactors vary as widely as the designs of the reactors. This is determined not only by the chemical behavior of the different electrolytes, especially their corrosivity, but also by the very different products. These can be formed as solids, as in electrodeposition, in liquid form, as in the case of many substances that react further in the liquid phase, or as a gaseous phase, for example, in the electrolysis of water. Operating temperatures cover a wide range, from room temperature to 1000 °C. In most cases the electrolytes are liquid solutions or melts, but more recently also solids (e.g., solid polymer electrolytes) and in special cases gases, as in high‐temperature water electrolysis, or plasmas in glow‐discharge electrolysis. Accordingly, the materials and shapes of the electrodes also very diverse. The simplest electrodes are those with flat surfaces. Two such electrodes face each other a few millimeters apart in order to minimize the ohmic potential drop across the gap, or they are divided by a liquid‐permeable diaphragm or gas‐permeable membrane, which also separates the electrolyte chambers from one another. In many cases specially shaped electrodes are used that better meet the requirements of a process. Their influence on the design and operation of the reactors are the subject of this article. In particular, these are reactors with gas‐evolving electrodes and special reactor designs to meet specific requirements.

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