Bubble Coalescence: Effect of Bubble Approach Velocity and Liquid Viscosity

0444323 - ÚCHP 2016 RIV GB eng J - Journal Article
Orvalho, Sandra - Růžička, Marek - Olivieri, G. - Marzocchella, A.
Bubble Coalescence: Effect of Bubble Approach Velocity and Liquid Viscosity.
Chemical Engineering Science. Roč. 134, SEP 29 (2015), s. 205-216. ISSN 0009-2509. E-ISSN 1873-4405
R&D Projects: GA MŠMT(CZ) LD13018
Institutional support: RVO:67985858
Keywords : bubble coalescence * bubble approach velocity * liquid viscosity
Subject RIV: CI - Industrial Chemistry, Chemical Engineering
Impact factor: 2.750, year: 2015

The goal of this study is to present new experimental data on the effect of the bubble approach velocity and liquid viscosity on pairwise bubble coalescence. Measurements were performed to investigate the dynamics of bubble coalescence under well-defined laboratory conditions. Air and pure aqueous solutions of alginate (no surfactants) were the phases. The bubbles were formed from two vertical capillaries, under constant flow conditions. The coalescence process was recorded with a fast video and then image analysed, to evaluate the bubble growth, bubble expansion rate, the first bubble touch, bubble contact time T, bubble coalescence efficiency E. Three control parameters were tested. The bubble size D on contact was set by the spacing between the capillaries (D = 1 and 1.5 mm). The bubble approach velocity V was controlled by the gas input (V = 0.031 - 39 mm/s). The liquid viscosity μ was adjusted by the alginate content (μ = 1.2 - 10.3 mPa.s).
Permanent Link: http://hdl.handle.net/11104/0248846