Study of the dynamic behaviour in a multiphase flow system when bubbles of CO2 or Air passes through the interface of two immiscible liquids.

Abstract

The behavior of bubbles at the interface between oil/water is studied. The test are done with Silicon Oil 10 cS as the overlaying liquid and aqueous solutions underneath. Polyanionic Cellulose (PAC) were implemented and dissolved in distilled water with the purpose of having a shear thinning fluid behavior. Air or CO2 bubbles are injected from the bottom of the container. In this project the dynamics and behavior of the bubble at the is evaluated. When the buoyancy force of a single bubble is high enough to overcome the capillary forces at the interface the bubble that is moving upwards drift a column of water that is dragged into the lighter liquid.

A total of 18 different tests were performed. Fluid dynamics of the bubbles and interface of the fluids were examined, explained, and compared between the multiple test performed. With the utilization of high-speed camera, the effect of any asymmetry in the bubble shape and the rising pathway is analyzed. Physical data as the viscosity was obtain using a viscosimeter, were it provided the shear rate and shear stress of the fluids that were used. A tensimeter was used to obtained data of the interfacial and superficial tension of each fluid used on the tests. Based of equations obtained on previous studies three different sizes of the bubble were chosen and used for the experiment 0.014, 0.065 and 0.11 cm3 respectively.