Effect of Plate Oscillation on Bubble Residence Time in an Aerated Stagnant Liquid

Abstract

Gas transfer efficiency during absorption is an important factor in various technological processes involving the interaction between liquid and gaseous systems. It is known that gas bubble motion characteristics strongly affect the efficiency of mass transfer during gas absorption. A device for mechanical vibration of an aerated liquid was designed, based on a cylindrical column filled up with tab water and a plate oscillating in the vertical direction. The goal of the present study is to investigate the effect of vibration parameters such as amplitude, frequency and form of the applied signal on the efficiency of the oxygenation process. Bubble residence time in the liquid and bubble depth of submergence related to the oscillating plate surface were chosen as main parameters for measurements. Furthermore, experiments were conducted to study the effect of the design parameters of the vibrating plate on bubble motion characteristics. The resultant data show that bubble residence time and depth of submergence can be controlled by changing the amplitude, the frequency and the form of the vibration field applied.

Gas Holdup from the Free Surface of Liquids Subjected to a Vertically Vibrating Plate

“…The bubble velocity was calculated by using obtained in previous studies by the present authors [7]. The following expression was used for calculation of the bubble rise velocity:…”

“…The experimental method of a previous study by the current authors [7] was used to obtain the values of this variable.…”

“…In the present research, a vibrating plate suggested in previous studies [6,7] is used, but here it is located sufficiently close to the liquid surface. Vibrations of the plate generate gas bubbles and entrain them into the liquid.…”

“…The influence of vibrations on gas bubble behavior in liquids was investigated theoretically and experimentally in various studies [5][6][7]. It was shown theoretically that when a small bubble is placed in a vertically vibrating liquid, it is subjected to a downward force which opposes the buoyancy force due to gravity.…”

Optimization of semi‐pulsatile liquid‐liquid extraction operations in milli‐channels

“…[ 15 ] Moreover, the use of pulsatory flow to intensify transport properties is now being studied comprehensively, with application in a plethora of fields, and the same can be found in a host of research. [ 16–25 ]…”