Publication: Effect of insoluble surfactant on turbulent bubbly flows in vertical channels
Program
KU-Authors
KU Authors
Co-Authors
Lu, Jiacai
Tryggvason, Gretar
Publication Date
Language
Type
Embargo Status
Journal Title
Journal ISSN
Volume Title
Alternative Title
Abstract
The effect of an insoluble surfactant on the structure of turbulent bubbly upflow in a vertical channel is examined by direct numerical simulations (DNS). For nearly spherical bubbles the presence of a surfactant reduces the lateral lift on the bubbles and changes the structure of the flow in major ways. Clean bubbles are driven to the walls by the lift force and the void fraction distribution has a well defined peak near the walls, resulting in significant reduction in flow rate. Bubbles with strong enough surfactants do not experience significant lateral lift and remain in the bulk flow. Indeed, when surfactant is present the addition of bubbles to a turbulent flow has relatively little effect on the flow, once the pressure gradient is adjusted to account for the reduced weight of the mixture.
Source
Publisher
Elsevier
Subject
Mechanics
Citation
Has Part
Source
International Journal of Multiphase Flow
Book Series Title
Edition
DOI
10.1016/j.ijmultiphaseflow.2017.05.003