Numerical simulation of kink dynamics for a two-component field

1984 ◽  
Vol 29 (6) ◽  
pp. 1154-1159 ◽  
Author(s):  
P. Hawrylak ◽  
K. R. Subbaswamy ◽  
S. E. Trullinger
Keyword(s):  
Numerical Simulation ◽  
Two Component ◽  
Component Field

CFD-DEM Numerical Simulation and Experimental Validation of Heat Transfer and Two-Component Flow in Fluidized Bed

2017 ◽  
Vol 16 (1) ◽  
Author(s):  
Feihong Guo ◽  
Zhaoping Zhong
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Fluidized Bed ◽  
Quartz Sand ◽  
Thermal Imager ◽  
Gas Velocity ◽  
Bed Height ◽  
Two Component ◽  
Superficial Gas Velocity ◽  
Infrared Thermal Imager

AbstractBased on the improved computational fluid dynamics and discrete element method (CFD-DEM), heat transfer and two-component flow of biomass and quartz sand have been studied from experiments and numerical simulation in this paper. During experiments, the particle temperature and moving images are respectively recorded by infrared thermal imager and high speed camera. With the increase of the velocity, the mixing index (MI) and the cooling rate of the particles are rising. Due to larger heat capacity and mass, the temperature of biomass drops slower than that of quartz sand. Fictitious element method is employed to solve the incompatibility of the traditional CFD-DEM where the cylindrical biomass are considered as an aggregation of numerous fictitious sphere particles arranged in certain sequence. By the comparison of data collected by infrared thermal imager and the simulated results, it can be concluded that experimental data is basically agreement with numerical simulation results. Directly affected by inflow air (25℃), the average temperature of particles in the bed height area (h>30 mm) is about 3 degrees lower than that of the other heights. When the superficial gas velocity is larger, the fluidization is good, and the gas temperature distribution is more uniform in the whole area. On the contrary, bubbles are not easy to produce and the fluidization is restricted at lower superficial gas velocity. Gas-solid heat transfer mainly exists under the bed height of 10 mm, and decreases rapidly on fluidized bed height. The mixing index (MI) is employed to quantitatively discuss the mixing effectiveness, which first rises accelerate, then rising speed decreases, finally tends to a upper limit.

Multi-layered diffusive convection. Part 2. Dynamics of layer evolution

2010 ◽  
Vol 651 ◽  
pp. 465-481 ◽  
Author(s):  
TAKASHI NOGUCHI ◽  
HIROSHI NIINO
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Direct Numerical Simulation ◽  
Analytical Model ◽  
The Other ◽  
One Dimensional ◽  
Turbulent Entrainment ◽  
Diffusive Convection ◽  
Two Component

Evolution of layers in an unbounded diffusively stratified two-component fluid and its dynamics are studied by means of a direct numerical simulation (DNS) and an analytical model. The numerical simulation shows that the layers grow by repeating mergings with the neighbouring layers. By analysing the results of the numerical simulation, the mechanism of the merging is examined in detail. Two modes of merging are found to exist: one is the layer vanishing mode and the other is the interface vanishing mode. The vanishings of layers and interfaces are caused by turbulent entrainment at the interfaces. Based on the analysis of the numerical model, a one-dimensional asymmetric entrainment model is proposed. In the model, each layer is assumed to interact with its neighbouring layers through simplified convective entrainment laws. The model is applied to two simple configurations of layers and is proved to reproduce the layer evolutions found in the DNS successfully.

scholarly journals Numerical simulation of two-component flow fluid - fluid in the microchannel T- type

2015 ◽  
Vol 23 ◽  
pp. 01043 ◽  
Author(s):  
A.A. Shebeleva ◽  
A.V. Minakov ◽  
A.A. Yagodnitsina ◽  
V.G. Andyuseva
Keyword(s):  
Numerical Simulation ◽  
Two Component

Numerical simulation and solutions of the two-component second order KdV evolutionarysystem

2017 ◽  
Vol 34 (1) ◽  
pp. 211-227 ◽  
Author(s):  
Asif Yokus ◽  
Haci Mehmet Baskonus ◽  
Tukur Abdulkadir Sulaiman ◽  
Hasan Bulut
Keyword(s):  
Numerical Simulation ◽  
Second Order ◽  
Two Component

A Continuous Interface Model for the Direct Numerical Simulation of Phase-Change in Two-Component Liquid-Vapor Flows

2002 ◽  
Author(s):  
Ce´lia Fouillet ◽  
Didier Jamet ◽  
Daniel Lhuillier
Keyword(s):  
Numerical Simulation ◽  
Phase Change ◽  
Diffuse Interface ◽  
Governing Equations ◽  
Closure Relation ◽  
Second Gradient ◽  
Two Component ◽  
Change Problem ◽  
Good Agreement ◽  
Liquid Vapor

This paper presents a model dedicated to the numerical simulation of two-component liquid-vapor flows with phase-change. This model is an extension to binary mixtures of the second gradient method, initially dedicated to pure fluids. It is a diffuse interface method: by assuming that the free energy of the mixture depends on its density gradient, liquid-vapor interfaces are described as volumetric transition regions across which physical properties vary continuously. The corresponding governing equations of the mixture are derived and the thermodynamic closure relation is established in order to recover the equilibrium properties of a mixture. As a first validation of this model, it is applied to study a one-dimensional isothermal phase-change problem. When the system reaches a stationary state, an asymptotic analysis shows that this model is in good agreement with sharp interface models, as well as numerical calculations.

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