Related Experiment Video
Updated: Nov 21, 2025

Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
Published on: May 9, 2021
Pressure oscillation of an air pocket beneath a water column in a vertical riser
1Dept. of Civil and Environmental Engineering, University of Alberta, Edmonton, AB, Canada
Abstract:
Storm geysers have received significant attention lately due to its more frequent occurrences and the induced severe local flooding and infrastructure damages. Previous studies suggested that the air pocket pressure oscillated during geyser events especially in rapid filling process, but only the peak values were studied and the oscillation period was not discussed in detail. In this paper, a theoretical model was developed focusing on the period of the pressure oscillation induced by the expansion/compression of the air pocket below a water column in a vertical riser with film flow. It was found that the oscillation period was a function of the initial air pocket volume, initial air pocket pressure head, the riser diameter, and the initial water column length. The oscillation period increased with the air pocket pressure head and the air pocket volume, but decreased with the riser diameter and the polytropic coefficient. The oscillation period increased then decreased with an increasing water column length. Further, when considering the film flow along the riser, the oscillation period decreased slightly from the analytical solution. It was also found that the inflow rate change did not significantly influence the oscillation period.
More Related Videos
08:32Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels
Published on: January 28, 2022
10:02Characterization of the Isolated, Ventilated, and Instrumented Mouse Lung Perfused with Pulsatile Flow
Published on: April 29, 2011
Related Concept Videos
Sound as Pressure Waves
The pressure fluctuation depends on the difference in displacements between the successive points in the...
Damped Oscillations
Although friction and other non-conservative...
Excess Pressure Inside a Drop and a Bubble
Pressure Variation in a Fluid at Rest
When measuring pressure at two different levels within the fluid, the difference in...
Buoyancy
Standing Waves in a Cavity