Bubble size distribution and mass transfer on a three-phase electroflotation column
| Autor: | Lassaad Ben Mansour, Maroua Mejri |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Fluid Flow and Transfer Processes
Mass transfer coefficient Coalescence (physics) Materials science 020209 energy Bubble Schmidt number Analytical chemistry Reynolds number 02 engineering and technology Condensed Matter Physics Cathode Anode law.invention symbols.namesake 020401 chemical engineering law Mass transfer 0202 electrical engineering electronic engineering information engineering symbols 0204 chemical engineering |
| Zdroj: | Heat and Mass Transfer. 55:2235-2245 |
| ISSN: | 1432-1181 0947-7411 |
| Popis: | This work aims to experimentally study the bubble size distribution and the oxygen transfer on the electroflotation process. The distribution of bubbles was measured using a high-speed camera. The measurements were conducted in a three-phase electroflotaion column (water- gas-olive stone) equipped with insoluble electrodes, stainless steel as cathode and titanium, covered with ruthenium oxide, as anode. The volumetric mass transfer coefficient kla was determined for some operating parameters such as current density, solid concentrations and sizes. In order to calculate the global coefficient of mass transfer kl, the specific interfacial area, a, was determined. It was chiefly found that bubble size distribution depends on current density and solid concentration, and the wide range of bubble sizes was found to be affected by the phenomenon of break up and coalescence. kla tended to decrease with the increase of solid concentrations. kl exhibited the same behavior as the volumetric mass transfer coefficient. The experimental results were also fitted with the theoretical models, relating ‘kla’, ‘kl’ and ‘a’ with Reynolds number, Schmidt number and operating conditions. |
| Databáze: | OpenAIRE |
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