Modelling and measurement of bubble formation and growth in electroflotation processes
M. D. Shahjahan K. A. Sarkar , Piotr M. Machniewski , Geoffrey M. Ewans
AbstractElectroflotation is used in the water treatment industry for the recovery of suspended particles. In this study the bubble formation and release of hydrogen bubbles generated electrolytically from a platinum cathode was investigated. Previously, it was found that both the growth rate and detachment diameter increased with increasing wire diameter. Conversely, current density had little effect on the released bubble size. It was also found that the detached bubbles rapidly increased in volume as they rose through the liquid as a result decreasing hydrostatic pressure and high levels of dissolved hydrogen gas in the surrounding liquid. The experimental system was computationally modelled using a Lagrangian-Eulerian Discrete Particle approach. It was revealed that desorption of gaseous solutes from the electrolyte solution, other than hydrogen, may have a significant impact on the diameter variation of the formed bubbles. The simulation confirmed that liquid circulation (forced or induced by the rising bubble plume) influences hydrogen supersaturation (concentration) in the neighbourhood of the electrode and also size of the resulting bubbles.
|Journal series||Chemical and Process Engineering , [Inżynieria Chemiczna i Procesowa], ISSN 0208-6425|
|Publication size in sheets||0.5|
|Conference||14th European Conference on Mixing, 10-09-2012 - 13-09-2012, Warszawa, Polska|
|Keywords in Polish||średnica bańki, oderwanie, masa transferu, modelowanie, CFD|
|Keywords in English||electroflotation, bubble diameter, detachment, mass transfer, CFD modelling|
|Score|| = 15.0, 18-05-2020, ArticleFromJournalAndMatConfByConferenceseries|
= 15.0, 18-05-2020, ArticleFromJournalAndMatConfByConferenceseries
|Publication indicators||= 4; : 2013 = 0.622; : 2013 = 0.467 (2) - 2013=0.408 (5)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.