A Numerical Study on Cooling-Solidification Process of Urea Particles in Prilling Tower

2014 ◽  
Vol 47 (8) ◽  
pp. 628-634 ◽  
Author(s):  
Ali Mehrez ◽  
Shinichi Ookawara ◽  
Ahmed Hamza H. Ali ◽  
Masaaki Suzuki
Keyword(s):  
Numerical Study ◽  
Solidification Process

Numerical Study of Liquid Core Solidification in Influence of Soft Reduction Deformation on Steel Slab Continuous Casting Process

2008 ◽  
Vol 575-578 ◽  
pp. 80-86 ◽  
Author(s):  
J. Luo ◽  
Xin Lin ◽  
Yan Hong Ye ◽  
K.W. Liu
Keyword(s):  
Continuous Casting ◽  
Numerical Study ◽  
Liquid Core ◽  
Solidification Process ◽  
Casting Process ◽  
Reduction Factor ◽  
Two Dimensions ◽  
Temperature Function ◽  
Soft Reduction ◽  
Steel Slab

A two dimensions (2D) multiphase solidification model is used to study the liquid core solidification in the influence of deformation during soft reduction of continuous casting (CC). The transient transport equations (mass, momentum and enthalpy) for each phase of a thin steel slab CC are solved. Four different cases including of density-temperature function and deformation reduction factor on this CC are simulated. The solidification ending point position of liquid core, temperature, velocity and fracture of liquid and solid phases are compared. Understandings to the deformation and liquid core formation mechanism on soft reduction solidification process of CC are improved.

Solidification of a Binary Solution (NH4Cl+H2O) under Shear Flow: A Numerical Study

2014 ◽  
Vol 217-218 ◽  
pp. 174-181
Author(s):  
Akshaya Kumar Nayak ◽  
Nilkanta Barman ◽  
Himadri Chattaopadhyay
Keyword(s):  
Mathematical Model ◽  
Shear Flow ◽  
Numerical Study ◽  
Binary Solution ◽  
Species Conservation ◽  
Solidification Process ◽  
Bulk Solution ◽  
Computational Domain ◽  
Simpler Algorithm ◽  
Slurry Layer

In the present work, the solidification behaviour of a metal analogues transparent binary solution (8 wt% of NH4Cl in H2O) under shear flow is investigated numerically. The shear flow in the mush is developed due to flow over an inclined cooling plate. The dendrites formed during solidification are fragmented under the shear flow and transported into the bulk solution. The suspended dendrites form a slurry layer in the domain. Consequently, a suitable mathematical model is considered to study the transport phenomena. In the mathematical model, the free surface of the solution is represented by the volume-of-fluid (VOF) method. The solidification process is modelled by a set of volume-averaged-single-phase mass, momentum, energy and species conservation equations. A separate equation is considered for the solid velocity based on Stokes model. The governing equations are solved based on the pressure-based semi-implicit finite volume method according to the SIMPLER algorithm using TDMA solver along with the enthalpy update scheme. Finally, the simulation predicts temperature, velocity, solid fraction and the species distributions in the computational domain. Normal 0 false false false EN-US X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;}

Numerical Study on Solidification Process and Shrinkage Porosity for Engine Block Casting

2010 ◽  
Vol 37-38 ◽  
pp. 753-756
Author(s):  
Jin Xiang Liu ◽  
Ri Dong Liao ◽  
Zheng Xi Zuo
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Analysis ◽  
Cylinder Head ◽  
Numerical Study ◽  
Solidification Process ◽  
Shrinkage Porosity ◽  
Temperature Distributions ◽  
Simulation Results ◽  
Casting Design

The latent heat releasing and the criterion for shrinkage porosity in solidification progress of casting are studied. A numerical analysis is presented for solidification progress of the cylinder head casting using finite element method. The temperature distributions of the casting in different solidification phases are solved, and the shrinkage porosity is predicted. Based on this, the solidification progress of casting is evaluated. The simulation results can offer a helpful reference for casting design of cylinder head casting.

scholarly journals Calculated Study of the Influence of Overheating Aluminum Melt on the Dynamics the Granulation Process

2020 ◽  
pp. 84-93
Author(s):  
Alexander P. Skuratov ◽  
Alexander V. Ivlev ◽  
Artem A. Pianykh
Keyword(s):  
Heat Transfer ◽  
Phase Transition ◽  
Solid Phase ◽  
Numerical Study ◽  
Three Dimensional ◽  
Solidification Process ◽  
Square Root ◽  
Effective Heat Capacity ◽  
Granulation Process ◽  
Aluminum Melt

A three-dimensional mathematical model of the solidification process of a liquid metal is considered, taking into account the mobility of the boundaries at which the phase transition is carried out (Stefan boundary value problem). The algorithm of calculation is improved, allowing due to the use of the Dirac δ-function in determining the effective heat capacity to take into account the nonlinearity of the equation of unsteady thermal conductivity and the heat of the phase transition. A numerical study of heat transfer during solidification of lead-containing aluminum melt droplets in air and water is carried out. The influence of droplet size and melt overheating on the solidification dynamics of granules has been studied. An approximate ratio based on the square root law is proposed, taking into account the amount of overheating of the liquid phase and linking the thickness of the formed solid phase with the duration of the granulation process

Numerical Study on Mold Filling Process of Casting

2008 ◽  
Vol 575-578 ◽  
pp. 87-92
Author(s):  
Xiao Qiang Pan ◽  
Hong Zhu Sun ◽  
Jun Da Chen ◽  
Yu Ling Zhu
Keyword(s):  
Numerical Simulation ◽  
Initial Conditions ◽  
Numerical Study ◽  
Solidification Process ◽  
Mold Filling ◽  
General Purpose ◽  
Filling Process ◽  
Numerical Heat Transfer ◽  
Multiphase Fluid Flow ◽  
Multiphase Fluid

Techniques of numerical simulation on mold filling process of casting are investigated in this paper. The mathematical model is formed on the ground of some selected theories in computational fluid dynamics (CFD), Numerical Heat Transfer (NHT) and computational methods to interfacial tracking. The discrete solution to the governing equations appeals to Finite Volume Method (FVM) on structured mesh. As for viscous turbulence flow and multiphase fluid flow in mold filling, engineering turbulence model and Volume of Fluid (VOF) method are adopted in the algorithms, respectively. As a debut, the general-purpose CFD software is used to establish the practicable mechanical model for the simulation. By means of numerical simulation, variation and distribution of velocity, temperature, stress and configuration of casting, etc. with respect to time and space in the filling process can be quantitatively analysed in detail, which is helpful for engineers to optimize their design of technics with less time and less cost and is meaningful to provide the subsequent simulation, solidification process of casting, with initial conditions.

Numerical Study of a Vertical Solidification Process under Magnetic Field in Unsteady State

2010 ◽  
Vol 297-301 ◽  
pp. 254-262
Author(s):  
Sabrina Nouri ◽  
Mouhamed Benzeghiba ◽  
Ahmed Benzaoui
Keyword(s):  
Magnetic Field ◽  
Binary Alloy ◽  
Numerical Study ◽  
Magnetic Field Effect ◽  
Solidification Process ◽  
Computer Code ◽  
Thermosolutal Convection ◽  
Unsteady State ◽  
Vertical Solidification ◽  
The Magnetic Field

Numerical computation is achieved in an axisymmetric configuration to analyze the magnetic field effect on thermosolutal convection during vertical solidification of a binary alloy. The bath is exposed to a uniform temperature profile in unsteady state. During the growth three regions appear: liquid, mushy and solid zones. The mushy zone is assimilated to porous medium. A mathematical model of heat, momentum and solute transfer has been developed in primitive variables (pressure-velocity). A single domain approach (enthalpy method) is used to build the equations system. In this context, a computer code has been developed and validated with previous studies. The results in term of stream function and solute concentration show the strong effect of the magnetic field on the fluid flow and on the solutal stratification. The effects of magnetic field and melt convection intensity were demonstrated. The main results show that the quality of highly doped binary alloy crystals can be improved when the growth process occurs at low pulling rates and under a magnetic field.

scholarly journals A numerical study of the solidification process of a retracting fluid filament

2021 ◽  
Author(s):  
Binh D. Pham ◽  
Truong V. Vu ◽  
Lien V. T. Nguyen ◽  
Cuong T. Nguyen ◽  
Hoe D. Nguyen ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Flat Surface ◽  
Numerical Study ◽  
Solidification Process ◽  
Navier Stokes ◽  
Front Tracking Method ◽  
Fluid Filament ◽  
Two Phases ◽  
Energy Equations ◽  
Eulerian Grid

In this study, the retraction and solidification of a fluid filament are studied by a front-tracking method/finite difference scheme. The interface between two phases is handled by connected points (Lagrangian grid), which move on a fixed grid domain (Eulerian grid). The Navier-Stokes and energy equations are solved to simulate the problem. Initially, the fluid filament has a shape as half of a cylindrical capsule contact with a cold flat surface. We consider the effect of the aspect ratio (Ar) on the solidification of the fluid filament. It is found that an increase in the aspect ratio (Ar) in the range of 2 – 14 causes the retraction length to increase. The rate of the solidification of a fluid filament decreases when the Ar ratio increases. The solidification time, the solidification height and the tip angle of the fluid filament under the influence of the aspect ratio are also considered. After complete solidification, a small protrusion on the top of the solidified fluid filament is found.

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