Table 1 - uploaded by Carlos Salinas
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The objective of the present work is to develop a numerical model to analyze the melting solidification process considering the natural convection phenomena to alloy aluminum in a square section. Physical medium is taken as incompressible Newtonian fluid with isotropy thermal properties where the heat is transferred by conduction and convection, in...
Context in source publication
Context 1
... mathematical model for two dimension liquid-solid phase-change problem, included the natural convection, in a simple domain solution considering alloys aluminum material is based on the Continuity, Linear Momentum and energy equations are presented by equations (1)- (4). It is supposed incompressible Newtonian fluid with properties constants (See table 1) except the density evaluated as linear function of temperature by Boussinesq approximation. The enthalpy method [27] is used to model the phase-change latent heat liberation by using a liquid-solid fraction function [30]. ...
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A two-dimensional rectangular enclosure containing a binary-fluid saturated porous layer of finite thickness placed in the centre of the cavity is considered. Phase change is neglected. Vertical and horizontal solid boundaries are assumed to be isothermal and adiabatic, respectively. A horizontal temperature gradient is imposed, driving convection...
A two-dimensional rectangular enclosure containing a binary-fluid saturated porous layer of finite thickness placed in the centre of the cavity is considered. Phase change is neglected. Vertical and horizontal solid boundaries are assumed to be isothermal and adiabatic, respectively. A horizontal temperature gradient is imposed, driving convection...
Citations
... The effect of natural convection on the total solidification process of squeeze casting is presented by A. Yu et al. [9]. R. Laqua et al. [10] presented a simulation of mold filling and solidification of investment casting processes by using the CFD program FLUENT and the casting simulation tool C. Hernan [11] developed a numerical model to analyse the melting solidification process considering the natural convection phenomena. I. Nova [12] studied the thermal processes in the casting by using SIMTEC program to simulate the solidification process for the sand mold system and comparing numerical results with experimental data. ...
Numerical simulation is implemented to evaluate the effect of sand mold thicknesses on the solidification time for pure iron. The finite volume technique; explicit time scheme; enthalpy method is adopted for the simulation. The thermo-physical properties of the mold and the metal are assumed to be temperature independent, however, for the metal, the properties can be different in the solid and liquid phases. The outer surfaces of the mold transfer heat by convection to surroundings. It is found that the solidification time can be controlled by the mold thickness only when the ratio of the sand size to metal size is smaller than or equal to a definite value. This ratio can be considered as the critical one, beyond which the mold thickness has no effect on the solidification time.
... In this work they analyzed the propagation of glass during the forming process and the temperature profiles. Salinas (2006) studied numerically the solidification of aluminum alloy in a square cavity considering the flow of a incompressible Newtonian fluid with isotropic thermal properties where the phase change and the heat transfer by conduction and convection were considered. The mathematical model was based on a set of partial differential equations given by momentum, continuity and heat transfer equations. ...
A computer simulation study of a laminar steady-state glass flow that exits from a channel cooled with water is reported. The simulations are carried out in a two-dimensional, Cartesian channel with a backward-facing step for three different angles of the step and different glass outflow velocities. We studied the interaction of the fluid dynamics, phase change and thermal behavior of the glass flow due to the heat that transfers to the cooling water through the wall of the channel. The temperature, streamline, phase change and pressure fields are obtained and analyzed for the glass flow. Moreover, the temperature increments of the cooling water are characterized. It is shown that, by reducing the glass outflow velocity, the solidification is enhanced; meanwhile, an increase of the step angle also improves the solidification of the glass flow.
... In this work, the propagation of glass during the forming process and the temperature profiles were analyzed. Salinas (2006) studied numerically the solidification of aluminum alloy in a square cavity considering the flow of an incompressible Newtonian fluid with isotropic thermal properties where the phase change and the heat transfer by conduction and convection were considered. The mathematical model was based on a set of partial differential equations given by momentum, continuity and heat transfer equations. ...
A numerical investigation of laminar flow in a two-dimensional, Cartesian flow that exits from a
short channel with a backward-facing step is carried out in this work for the Reynolds number range of
0.00054 ≤ Re ≤ 54. We studied the steady state fluid dynamics, phase change and heat transfer of the flow.
We analyzed the flow behavior occurring for different outflow velocities and three different configuration of
the step. The incompressible working fluid was glass. The temperature, streamline, phase change and pressure fields are obtained and analyzed as a function of position. In order to obtain a better understanding of the step
angle influence on the fluid dynamics, we obtained the heat transfer flux rates and the axial velocity profiles.
