Numerical Simulation of Single‐Bubble Dynamics in High‐Viscosity Ionic Liquids Using the Level‐Set Method

Abstract

Two numerical models for studying the dynamics of formation and rise of single bubbles in high-viscosity ionic liquids were implemented using the level-set method. The models describe two stages of bubble dynamics: bubble formation at the inlet nozzle and bubble displacement across the column. The models were experimentally validated through a laboratory-scale bubble column using water-glycerol mixtures and two imidazolium-type ionic liquids. The models were consistent with the experimental tests for Reynolds numbers < 5. Outside this range, the models tend to underestimate the bubble terminal velocity, which can be explained by the effect of the high velocity and pressure gradients close to the gasliquid interface. The models also predicted the velocity and pressure fields near the bubble surface before and after detachment.

Quantitative characterization of bubble evolution in mineral oil for different air‐injection nozzles

“…It is seen in Figure 15 that in mineral oil, Re is lower than 300, and C d ranges between 2.5 and 4.3. According to the results obtained by Carvajal et al 50 Re is much larger, and C d is smaller in deionized water. In this context, the effect of the liquid viscosity is crucial.…”

Experimental Study on the Suspension Amount of Invasion Gas in Drilling Fluid with Yield Stress

“…Gas suspension is the combined effect of resistance produced by buoyancy and yield stress, and gas buoyancy is closely related to the bubble size. In the process of deep water and deep drilling, the pressure in the wellbore changes complicatedly and the bubble size is quite different [23,24]. The suspension concentration prediction model that only considers the yield stress of the drilling fluid has poor applicability.…”

Experimental and simulation studies of the shape and motion of an air bubble contained in a highly viscous liquid flowing through an orifice constriction

“…Here, is defined as the ratio between the continuous phase viscosity and the dispersed phase viscosity. A variety of numerical methods were used in these studies including the VoF method (Lörstad and Fuchs, 2004), the level-set method (Carvajal et al, 2015), a combined level-set and VoF method (Ohta et al, 2005) and the front-tracking method (Hua et al, 2008;Hua and Lou, 2007).…”