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Full-Text Articles in Engineering
Numerical Investigation Of The Layer-Inversion Phenomenon In Binary Solid Liquid Fluidized Beds, Kevin F. Malone, Bao H. Xu, Michael Fairweather
Numerical Investigation Of The Layer-Inversion Phenomenon In Binary Solid Liquid Fluidized Beds, Kevin F. Malone, Bao H. Xu, Michael Fairweather
The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering
Layer inversion behaviour in binary-solid liquid fluidized beds is examined using a Combined Continuum and Discrete Model. A suitable bidisperse system was selected from information in the literature. By simulating the fluidization of the system at a range of liquid velocities, varying degrees of segregation and mixing have been observed.
Bubble Size And Mass Transfer In A Modified Airlift Loop Reactor With Continuous Slurry Phase, Mengxi Liu, Chunxi Lu, Mingxian Shi
Bubble Size And Mass Transfer In A Modified Airlift Loop Reactor With Continuous Slurry Phase, Mengxi Liu, Chunxi Lu, Mingxian Shi
The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering
A modified internal airlift loop reactor with continuous slurry phases was explored to investigate the local bubble size and the local mass transfer properties. A mathematical model was derived to simulate the bubble size in every flow region. Also, a new method was developed to measure the dissolved oxygen concentration.
Fluid Mechanical Phenomena Of Liquid-Solid Fluidization In The Centrifugal Field, Jan Margraf , Joachim Werther
Fluid Mechanical Phenomena Of Liquid-Solid Fluidization In The Centrifugal Field, Jan Margraf , Joachim Werther
The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering
The flow pattern in a rotating liquid-solid fluidized bed with particles in the micron range was investigated in the bed and in the freeboard. Simulations of the liquid flow in absence of particles with the CFD-Software CFX 5.7 showed a strong influence of the Coriolis force, which results in high tangential velocities. Experiments in a 1 m diameter rotor confirmed the results of the simulation. The fluidized bed is also moving in the tangential direction. The bed expansion is described by a Richardson-Zaki type correlation.
Numerical Modelling Of Sloshing With Vof Method, Hamid Rezaei, Mohammad Javad Ketabdari
Numerical Modelling Of Sloshing With Vof Method, Hamid Rezaei, Mohammad Javad Ketabdari
The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering
Sloshing in tanks carrying LNG, LPG and petroleum is an important phenomenon as dynamic pressure arises from sloshing can destroy the containing tanks. So it is vital to consider this phenomenon in design stages of carriers. The governing equations in fluid flow are conservation of mass and momentum. Modeling of free surface flow in tank needs a suitable tool. One of the most powerful tools to model the free surface is VOF method. Employing additional transport equation together with conservation of mass and momentum enable us to follow the free surface changes. A computer code was developed to evaluate sloshing …
Dynamic Simulation Of Gas Hydrate Formation In An Agitated Three-Phase Slurry Reactor, Shahrzad Hashemi, Arturo Macchi , Phillip Servio
Dynamic Simulation Of Gas Hydrate Formation In An Agitated Three-Phase Slurry Reactor, Shahrzad Hashemi, Arturo Macchi , Phillip Servio
The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering
Gas hydrate growth was simulated in an agitated three-phase slurry reactor using a dynamic model that incorporates hydrate formation kinetics as well as system hydrodynamics and interphase heat and mass transfer rates. Supersaturation ratios and mole consumption rates were evaluated as a function of time for different gas and liquid superficial velocities. Based on available data and the conditions investigated, the kinetic resistance was found to be more influential than the resistance to gas-liquid mass transfer.
Hydrodynamic And Rtd Of Sectionalized Bubble Column, Nahidh W. Mecaial, Burhan Sadik
Hydrodynamic And Rtd Of Sectionalized Bubble Column, Nahidh W. Mecaial, Burhan Sadik
The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering
The sectionalization of conventional bubble columns to tray partitioned bubble column using perforated trays has been used to investigate the effect of tray hole diameter, tray open area, superficial gas velocity, gas sparger design, and liquid phase properties on gas holdup, residence time distribution (RTD), and overall liquid-phase backmixing. The erected column is sectionalized into three stages using two perforated plates of different holes diameter and open free area. Overall gas holdup is measured experimentally by bed expansion technique. Liquid backmixing, mixing time and axial dispersion model (ADM) is determined using tracer response experiments. In general, it seems that the …
Volume Contraction In Liquid Fluidization Of Binary Solids Mixtures, Norman Epstein , R. Escudié, John R. Grace, Xiaotao T. Bi
Volume Contraction In Liquid Fluidization Of Binary Solids Mixtures, Norman Epstein , R. Escudié, John R. Grace, Xiaotao T. Bi
The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering
When liquid-fluidized particles of radically different sizes and densities mix, the serial (additive volume) model fails to predict the fluidized bed voidage due to contraction of the mixed bed relative to the volumetric sum of the corresponding monocomponent beds. Models are proposed to predict contraction reported in the literature for both upflow and downflow fluidization.