Collision and Attachment Interactions of Single Air Bubbles with Flat Surfaces in Aqueous Solutions - Drops and Bubbles in Contact with Solid Surfaces - page 211

Collision and Attachment Interactions of Single Air Bubbles
with Flat Surfaces in Aqueous Solutions

Anh V. Nguyen and Mahshid Firouzi
School of Chemical Engineering, The University of Queensland, Brisbane, Queensland, 4072,
Australia. E-mail: [e-mail]

Abstract
Interaction of air bubbles with solid surfaces is important in many chemical engineering applications with
mass and heat transfer, and separation processes. This review focuses on the collision and attachment inter-
actions between a rising bubble and a flat surface in water and surfactant solutions. The analysis involves
a numbers of important aspects of the bubble motion and contact interactions which are governed by both
long-range and short-range (thin film) hydrodynamics of the bubble rise, surfactant adsorption and desorp-
tion, wetting film drainage and rupture, and spreading and relaxation of three-phase contact lines. Featured
properties of air-water interface deformation, interfacial forces produced by adsorbed surfactants and inter-
facial mobility have a significant influence on the attachment and dewetting interactions.

Keywords
Bubble rise, surfactant adsorption and desorption, bubble deformation, surface forces, liquid film, dewetting

Contents

A. Introduction ............................................... 212

B. Motion of Bubbles Before Interacting with the Surface ....................... 213

1. Physiochemical Hydrodynamics and Interfacial Rheology of Bubble Rise .......... 213

2. terminal velocity]Terminal Velocity of bubble rise]Bubble Rise ................ 216

C. deformation of bubble]Deformation of Bubble Interacting with the Surface . ........... 217

1. Deceleration and Oscillation of Bubbles Interacting with the Surface . . ........... 218

2. Augmented Young-Laplace equation]Young-Laplace Equation ................ 221

D.interfacialinteractionforces]InterfacialInteractionForces ..................... 222

1.DLVOdisjoiningpressures]DisjoiningPressures........................ 222

2.Non-DLVODisjoiningPressures................................. 224

E.DrainageandRuptureofInterveningliquidfilms]LiquidFilms................... 225

1. Theories on drainage and rupture of wetting films]Drainage and Rupture of Wetting Films . 225

2. Effect of surfactants]Surfactants on Wetting Film Drainage and Rupture ........... 229

F.SpreadingandRelaxationofcontactlines]ContactLines ...................... 231

1. Hydrodynamic Theories . .................................... 232

2.molecular-kinetictheories]Molecular-KineticTheories .................... 233