Dynamic behavior of gas bubble detached from single orifice in magnetic fluid

Abstract

A Bubble’s behavior in a magnetic fluid is one of the most critical issues in understanding the characteristics of the gaseous-liquid two-phase flow in basic fluid science. In this study, to understand the dynamic behavior of a gas bubble in a magnetic fluid, a bubble detached from a single orifice in a magnetic fluid is investigated using a near-infrared light source with a long wavelength of 800–1000 nm. The surface tension of a magnetic fluid, which is a crucial factor in determining the bubble’s characteristics, is also investigated by the maximum bubble pressure method. Based on the visualization measured, it is found that the bubble diameter decreases by applying magnetic field. This is caused by a magnetic body force, that enlarges the bubble in the same direction as the buoyancy force. The measurement of the surface tension of the magnetic fluid shows that the surface tension increases as the applied magnetic field increases. From the measurement of the bubble dynamics, the volume of the detached bubble under a magnetic flux density can be evaluated by a force balance equation with an average error of 16.8%.