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Coalescence behavior of two bubbles growing side-by-side

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Abstract

Coalescence percentage and coalescence times of thin films formed between nitrogen bubbles wee measured in dilute aqueous solutions of sodium laurylsulfate, n-amyl alcohol, and l-butanol. The bubble pairs were formed on two adjacent capillary tubes through a well-controlled stepping motor, and the coalescence time was determined by an optical sensing method. The results showed the appearance of a sharp transition concentration, at which the coalescence percentage was drastically reduced. But the effect of bubbling frequency on transition concentration showed the opposite tendency in some cases, according to the properties of the solute added. Coalescence times increased with solute concentration and also increased with surface tension gradient.

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