Trajectory of a spherical bubble rising in a fully developed laminar flow. (December 2022)

• Record Type: Journal Article
• Authors: Yang, Bo; Jafarian, Mehdi; Freidoonimehr, Navid; Arjomandi, Maziar
• Is Part Of: International journal of multiphase flow. Volume 157(2022)
• Publication Date: 2022-12
• Subjects: Lift coefficient -- Bubble trajectory -- Bubble hydrodynamics -- Shear-induced lift force -- Bubble image velocimetry; Multiphase flow -- Periodicals; Écoulement polyphasique -- Périodiques; Multiphase flow; Periodicals; 620.1064
• DOI: 10.1016/j.ijmultiphaseflow.2022.104250
• Languages: English
• ISSNs: 0301-9322

Abstract

Highlights: Analysis of the rising trajectory of a microbubble in a fully developed laminar flow. Assess lift and drag forces on a bubble using bubble visualisation technique. Flow field visualisation using fine hydrogen bubble as the tracer. Abstract: The rising trajectory of bubbles subjected to shear-induced lift force in a vertical channel is of great interest for designing and optimising a variety of electrochemical equipment. In this work, the rising trajectory of a spherical microbubble with a diameter of 0.3-1.0mm in a vertical channel with a fully developed laminar flow is investigated experimentally. Subsequently, the lift and drag forces on the bubble are assessed. Due to the limitation of the existing correlations for lift force coefficient, a new correlation is developed, which can be used to estimate the trajectory of a bubble in a vertical channel. The effect of flow velocity gradient and bubble diameter on the bubble motion is discussed to control bubble rising trajectory. It is concluded that the lift coefficient for a spherical microbubble in vertical channels with a fully developed laminar flow is slightly higher than the reported shear lift coefficient for larger bubbles rising in a high viscous liquid.