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Showing 1 to 20 of 29 for “"Bubble Columns"”.
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Viscous liquids in bubble columns
… viscous Newtonian and non-Newtonian liquids in bubble columns with, and without, draft tubes. The importance of the parameters influencing bubble column reactors is discussed with reference to previous work. The shapes and rise velocities of single bubbles in these liquids were studied in an …
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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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Behaviour of Bubble Columns with Two and Three Phases
Bubble columns are multi-phase contactors widely used in the process industries. For proper design, effective operation and analysis of such columns, knowledge of the fluid-dynamics, mixing and transport parameters is essential. Hitherto, most studies have been on simple two-phase systems in …
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Hydrodynamics, Mixing, and Mass Transfer in Bubble Columns with Internals
<p>Bubble columns and slurry bubble columns are considered reactors of choice for a wide range of applications in the chemical, biochemical, and petrochemical industries. Most of the chemical applications of bubble columns include exothermic processes and hence they require some means of heat …
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Fluid Dynamics And Scale-Up Of Bubble Columns With Internals
Bubble columns and slurry bubble columns, as multiphase reactors, are favored for a wide range of applications in the chemical, biochemical, petrochemical and metallurgical industries. They are considered the reactor of choice for the Fischer Tropsch synthesis, among other applications, offering an …
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Numerical Modeling of Air-Water Flows in Bubble Columns and Airlift Reactors
Bubble columns and airlift reactors were modeled numerically to better understand the hydrodynamics and analyze the mixing characteristics for each configuration. An Eulerian-Eulerian approach was used to model air as the dispersed phase within a continuous phase of water using the commercial …
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Numerical Analysis of Multiphase Flow in Bubble Columns and Applications for Microbial Fuel Cells
… predict the hydrodynamics of a column reactor. Bubble columns have applications across many engineering disciplines and improved modeling techniques help to increase the accuracy of numerical predictions. An Eulerian-Eulerian multi-fluid model was used to simulate fluidization and to capture the …
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Numerical simulation of bubble columns by integration of bubble cell model into the population balance framework
Bubble column reactors are widely used in the chemicals industry including pharmaceuticals, waste water treatment, flotation etc. The reason for their wide application can be attributed to the excellent rates of heat and mass transfer that are achieved between the dispersed and continuous phases in …
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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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Studies of multiphase distribution and flow in bubble/ slurry bubble columns with /without internals and advanced sustainable construction materials using sophisticated measurement techniques
<p>"Bubble/slurry bubble columns have been widely studied and employed as multiphase flow reactors with and without vertical heat-exchanging tubes. In order to understand more deeply the effect of the dense internals on the hydrodynamics of bubble/slurry bubble column, systematic experiments were …
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The Effect of Operating Conditions on Gas Holdup and Mixing in Tower Fermenters
The design and operation of bubble columns is a subject which has recently received a great deal of attention, since applications of such equipment are increasing. Recent work has shown that there is a real possibility of utilizing bubble columns in aerobic systems used for fermentations. At …
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A fundamental approach to predicting mass transfer coefficients in bubble column reactors
A bubble column reactor is a vertical cylindrical vessel used for gas-liquid reactions. Bubble Columns have several applications in industry due to certain obvious advantages such as high gas-liquid interfacial area, high heat and mass transfer rates, low maintenance requirements and operating …
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Numerical Investigations of Bubble Column Equipped with Vertical Internals in Different Arrangements
Bubble columns are multiphase contactors with wide applications in industrial processes. Often they are equipped with longitudinal tube bundles to facilitate heat exchange. Studying effects of these internals on column hydrodynamics is vital for the design of these internals. Computational Fluid …
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Studies in three phase gas-liquid-solid fluidised systems
… when studies were conducted on fermentations in bubble columns. The present work highlights typical design and operating problems that could arise in such systems as waste water, chemical, biochemical and petroleum operations involving three-phase, gas-liquid-solid fluidisation; such systems are …
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Development of a computationally efficient bubble column simulation approach by way of statistical bubble micro-flow modelling
… achieved between the gas and liquid phases in bubble columns, coupled with the inherent efficient mixing these reactors offer, yield excellent heat and mass transfer characteristics. These attributes have been exploited commercially for decades, however, due to the complexity of the underlying …
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Use of computational fluid dynamics in the design of bubble column reactors
… depict the transport of discrete phases (gas bubbles or solid particles) and model biochemical reactions in a bubble column reactor are discussed here. The mixture model was used to calculate gas-liquid, solid-liquid and gasliquid-solid interactions. Multiphase flow is a difficult phenomenon …
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Heat and mass transfer in bubble column dehumidifiers for HDH desalination
… transfer processes governing the performance of bubble dehumidifier trays are studied in order to develop a predictive model and design rules for efficient and economical design of bubble column dehumidifiers for humidification-dehumidification (HDH) systems. As a result of their high heat …
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Mathematical Modelling of Tower Fermentation Processes
… (1) a model to describe liquid-phase mixing in bubble columns and tower fermenters; (2) an empirical method for predicting mixing parameters for both the backflow stirred tanks model and the axially-dispersed plug flow model; (3) a theoretical model describing oxygen mass transfer in bubble …
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