Abstract
A bubble motion in aqueous surfactant solutions is investigated with the numerical simulation. It is known that the reduction of the terminal velocity of rising bubbles is explained by the so-called Marangoni effect, which is caused by the surfactant adsorption to the air/water interface. But few studies have been done for the shear-induced lift force acting on a bubble under the presence of the Marangoni effect. Here, we conduct the simulation on the force acting on the contaminated bubble in a linear shear flow. To consider the Marangoni effect on the bubble motion, the balance equation for the concentration in liquid phase and the interfacial concentration at bubble surface are solved on the three-dimensional boundary-fitted grid system. The surfactant adsorption and desorption processes to the air/water interface are considered by the Langmuir's kinetics laws. The present simulation showed that the reduction of the lift force occurs when the surface concentration becomes sufficiently large. They also showed that the azimuthal distribution of surface concentration of surfactant gives a large influence to the lift force, although it doesn't to the drag force.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
