Evaporation process for concentrating sea water can be enhanced by bubbling operation

and it is not only significantly influenced by bubble size but also movement of bubbles. Thus

two different sizes of bubbling test rigs were set up indoor and outdoor. The movement

distribution

coalescence and rupture of large bubbles and small bubbles were experimentally analyzed with a single aeration inlet

two aerations inlets and multi-inlets at different gas fluxes

depths and inlet spacings. Small bubbles floating on the liquid surface had higher coverage and scattered more smaller droplets than large bubbles at a lower gas flow flux

implying that the small bubble pattern was more efficient in bubbling for the solar sea water concentration process. The coverage rate of small bubbles in the operation could reach 90%

increasing evaporation rate by 1-1.5 times

based on optimized operational parameters with gas flux at 0.4 L · min-1

level depth at 8 cm and inlet spacing at 12 cm.