Bubble coalescence and its effect on dynamic foam stability

✍ Scribed by Yoon Seong Cho; Janusz S. Laskowski

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 601 KB
• Volume: 80
• Category: Article
• ISSN: 0008-4034
• DOI: 10.1002/cjce.5450800216

✦ Synopsis

Abstract

The size of bubbles generated using a single‐hole sparger, a multi‐hole sparger and a flotation cell were measured. While the size of bubbles generated from the single‐hole sparger does not depend on frother concentration, the bubble size strongly depends on frother concentration when the multi‐hole sparges, or flotation cell, are utilized. The bubbles size ceases to depend on frother at the concentrations exceeding the value characteristic for each frother and referred to as the critical coalescence (CCC). All the bubble size vs. frother concentration curves converge on a single curve. Aqueous solutions of the frothers that are characterized by low CCC values from foams quite stable under dynamic conditions. Since bubble coalescence can be inhibited by frother concentrations exceeding the CCC, sparing systems can be studied and compared only at frother concentrations that exceed CCC.