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Showing 1 to 20 of 55 for “"bubble column"”.
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Mass transfer in bubble column contractors
… overall volumetric mass transfer coefficients in bubble column contactors have been investigated for water and aqueous electrolyte solutions. Two methods were used to obtain experimental data on volumetric mass transfer coefficients: the steady state oxidation technique and a transient method. The …
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Gas-liquid simulation of an airlift bubble column reactor
Airlift bubble column reactors are finding increasing application on industries such as bioprocess industries. The gas-liquid of two-phase fluid flow system has been carried out to investigate the hydrodynamics parameter. An Eulerian-Eulerian approach was used to model air as the dispersed phase …
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Wall Heat Transfer Coefficient in a Molten Salt Bubble Column
… a competitive titanium metal industry. A bubble column reactor is one of the suitable reactors that were considered for the production of titanium metal. This reactor will be operated with a molten salt medium. Bubble columns are widely used in various fields of process engineering, such …
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Gas holdup in a gas-liquid-fiber semi-batch bubble column
<p>A 4-m high, 15.24-cm diameter semi-batch bubble column connected to one of three perforated plate gas distributors with open area ratios A = 0.57%, 0.99%, and 2.14% is employed to study gas holdup and flow regime in Rayon and Nylon fiber suspensions. This study determines the effect of …
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Modelling the flow behaviour of gas bubbles in a bubble column
The bubble column reactor is commonly used in industry, although the fluid dynamics inside are not well understood. The challenges associated with solving multi phase flow problems arise from the complexity of the governing equations which have to be solved, which are typically mass, momentum and …
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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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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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CFD simulation of the dynamic flow behavior in a bubble column reactor
… Fluid Dynamics (CFD) model for modelling bubble columns is presented. This model is able to predict the bubbly flow parameter such as gas holdup, contact surface area, air volume fraction, pressure drop, and velocity magnitude to understanding the hydrodynamic flow behaviors. Three types …
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Hydrodynamics and gas holdup in a cocurrent air-water-fiber bubble column
… mechanisms of the fiber influences on bubble motions and gas holdup in gas-liquid-fiber bubble columns are connected to the unique structure and properties of fiber suspensions;An experimental study is completed to investigate the hydrodynamics and gas holdup in a cocurrent …
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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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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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GAS HOLD-UP MEASUREMENTS IN 0.3 m DIAMETER BUBBLE COLUMN: EFFECT OF ELECTROLYTES
… gas hold-up profiles in a 0.3 m diameter batch bubble column using a pair of Wire Mesh Sensors and six pressure transducers.</p>
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Comparison of Dairy Manure Anaerobic Digestion Performance in Gas-lift and Bubble Column Digesters
… with confined (gas-lift) and unconfined (bubble column) design. The anaerobic digestion performance and mixing behaviors were studied at different gas recirculation rate. It was found that the biogas production from the bubble column was constantly higher than that from gas-lift digester. …
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Development of a multi-stage bubble column dehumidifier for application in a hymidification dehumidification desalination system
… rates. The proposed solution is to create a bubble column for improved condensation. The condensing coil will be submerged in a body of water while humid air is sent through a sieve plate to create bubbles in this body of water where it will condense directly. Firstly, a single stage bubble …
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Characterizing the Growth of Cyanobacteria Using Coiled and Bubble Column Photobioreactors and Its Separation by Flocculation Filtration
… wall and lower biomass productivity, a bubble column reactor was developed. For bubble column photobioreactor, the optimum growth conditions obtained were light intensity of 77 μmol/m<sup>2</sup>/sec, carbondioxide flow rate of 162.5 mL/min (3.25 % volume of air), and air flow rate of 5 …
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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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Hybridization of electrical resistance tomography to population balance model for accurate bubble column reactor hydrodynamic parameter predictions
A novel approach of obtaining bubble size and spatial distribution is developed by hybridising techniques of Electrical Resistance Tomography and the Gas Disengagement Technique using a Population Balance as a framework. As a result, detailed hydrodynamic predictions suitable for Bubble Column …
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An experimental study on the effect of viscosity on micro-bubble size distribution and rise velocity in a bubble column
… capacities. DAF systems generate microscale air bubbles to lift suspended particles in influent solution to the top of a rectangular tank and remove them by scrapers. Due to the recent focus on different applications of micro and nanoscale air bubbles across many industrial operations, …
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Void fraction measurements in large (0.3 m) diameter bubble column using Wire Mesh Sensor and Pressure transducers- Effect of sparger
… measurements of the two-phase flow parameters in bubble columns is very well known. The aim of this research work is to report the spatial measurements of the void fraction distribution in a 30 cm diameter cylindrical bubble column using Wire Mesh Sensor (WMS) tomography and Pressure Transducers. …
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Computational fluid dynamics and experimental study of the hydrodynamics of a bubble column and an air-water jet-stirred cell
… the hydrodynamics of two bubbly flow systems, a bubble column and a waterjet-agitated flotation cell (Hydrojet cell), were studied by means of numerical simulations. In order to validate the bubble column CFD simulations Particle Image Velocimetry (PIV) was used. An experimental investigation …
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