Using sound to study bubble coalescence

Bubble break-up and the role of frother and salt

“…This gas flow rate was determined acoustically (Kracht and Finch, 2009). The addition of frother or salt did not alter the bubbling frequency (also determined acoustically) hence they did not alter the bubble size being generated at the capillary, which was 2.5 mm volume equivalent diameter.…”

On the origin of bi-modal bubble size distributions in the absence of frother

“…In the example shown, addition of frother prevented coalescence and the related fine bubble formation. The intention was to pursue this experimental technique and determine the gas rate at which coalescence-induced break-up occurred as a function of frother addition, following similar previous work that tracked the transition gas rate between non-coalescence and coalescence (Kracht and Finch, 2009). It became apparent, however, that the mechanism described by Tse et al was only one possibility.…”

Anomalous thickness variation of the foam films stabilized by weak non-ionic surfactants

“…There has been increasing research interest in froth behaviour of flotation [1][2][3][4][5][6][7][8][9][10][11][12][13]. Froth stability in flotation is largely determined by the stability of thin liquid films confined between air bubbles.…”