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Showing 1 to 13 of 13 for “"Bubble velocity"”.
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An automated camera tracking system for single bubble velocity profiling
An apparatus has been developed for the automated velocity profiling of single bubbles in aqueous solutions. Using a mobile IEEE 1394 camera and a control algorithm, the apparatus can automatically track a bubble as it rises in a Perspex column. The resulting video footage is then post-processed to …
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A study of Taylor bubbles in vertical and inclined slug flow using multiphase CFD with level set
… sensitivity analysis has determined that Taylor bubble velocity in slug flow is one such closure relation which significantly affects the calculation of these parameters. The main objective is to develop a unified higher-fidelity closure relation for Taylor bubble velocity. Here, we employ a …
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Heat transfer and bubble dynamics in bubble and slurry bubble columns with internals for Fischer-Tropsch synthesis of clean alternative fuels and chemicals
… Fischer-Tropsch (F-T) synthesis process. Slurry bubble column reactor is the reactor of choice for the commercialization of the F-T synthesis. Even though the slurry bubble column reactors and contactors are simple in structures, their design, scale-up, operation, and performance prediction are …
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Multivariable control of a rougher flotation cell
… the investigation. Online measurements included bubble velocity, average bubble area, bubble colour; Pt, Ni and Cu concentrate grade and concentrate flow rate and density. Air addition and pulp level was used as the manipulated variables.
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A Study of Spherical Bubbles in a Vertical Turbulent Boundary Layer
Liquid forces acting on individual bubbles in this turbulent boundary layer were also explored. This task was accomplished by employing a cinematic Particle Image Velocimetry system. Quadruple-pulsed images were obtained in a temporal sequence, such that the instantaneous liquid velocity and bubble …
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A Study of the Motion of Air Bubbles Moving Unrestrained in Water
… to improve understanding of the motion of air bubbles in water, in order to make possible more precise mass transfer calculations.</p><p>An accurate, low cost photographic technique was developed for studying the trajectory of air bubbles rising unrestrained in water.</p><p>The effect of …
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Caracterização experimental da separação gás-líquido em uma junção do tipo T inclinada
… of pressure distribution in each arm. The velocity profile and mean velocity of the liquid phase were characterized by means of Particle Image Velocimetry (PIV). A Shadow Sizer system and laser-based techniques were used to quantify the properties of the gas phase, such as bubble length and …
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Modelling and simulation of all-vanadium redox flow batteries
… then incorporated into the modelling frame work. Bubble formation as a result of evolution at the negative/positive electrode is included in the model, taking into account the attendant reduction in the liquid volume and the transfer of momentum between the gas and liquid phases, using a modified …
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Application of the polynomial chaos expansion to multiphase CFD : a study of rising bubbles and slug flow
… 3 covers the numerical simulation of a single bubble rising in a quiescent liquid bath. The pertinent quantities from these simulations are the terminal velocity of the bubble and terminal bubble shape. the simulations were performed using the open source gerris flow solver. A handful of test …
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Integrated Liquid/Steam Multiphase Flow Sensors for Geothermal Applications
… optic sensors will be externally mounted to a bubble column along with a digital camera. Data collected from both methods such as bubble diameter, velocity, and volume (air percentage) will be compared. The camera serves as a rudimentary calibration method. Three flow conditions are chosen for …
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Hydrodynamics and Mass Transfer in Bubble Columns
<p>Bubble columns and slurry bubble columns are multiphase reactors used for a wide range of applications in the biochemical, chemical, petrochemical, and metallurgical industries. In spite of their widespread usage, the scale-up of bubble columns remains an ongoing challenge. Various scale-up …
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Molecular fundamentals of foam fractionation
… activities. The process is based on forming bubbles in a certain mixed solution followed by detachment and rising of bubbles through a certain volume of this solution, and consequently on the formation of a foam layer on top of the solution column. Therefore, systematic analysis of this whole …
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Computational studies of viscoelastic multiphase flows
… c, in determining deformation of drops and bubbles, are also analyzed. The numerical code permits us to vary Ca, De and c independently, which is difficult to achieve experimentally. This capability is used to isolate the roles of these parameters on the nature of viscoelastic stress near …