Foam fraction as a function of gas velocity, for a 0.06% wt. SDS + 1.0% wt. 1-Butanol solution, at a liquid velocity of 0.205 cm/s; without particles (red, solid circles) and with resin coated or hydrophobic sand from STIM-LAB = 2.65 g/cc; mean size = 600-850 µm. The volume fractions are 10% (blue, open circles) and 20% (green diamonds).

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