Numerical analysis of the influence of tilt of crucibles on interface shape and fields of temperature and velocity in the unidirectional solidification process

2008 ◽  
Vol 310 (6) ◽  
pp. 1034-1039 ◽  
Author(s):  
Hiroaki Miyazawa ◽  
Lijun Liu ◽  
Sho Hisamatsu ◽  
Koichi Kakimoto
Keyword(s):  
Numerical Analysis ◽  
Solidification Process ◽  
Unidirectional Solidification ◽  
Interface Shape

The Studies on Numerical Simulation of Unidirectional Solidification Process in 23t Steel Ingot

2012 ◽  
Vol 502 ◽  
pp. 46-50
Author(s):  
Guang Wu Ao ◽  
Ming Gang Shen ◽  
Zhen Shan Zhang ◽  
Li Li Hong
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Temperature Distribution ◽  
Steel Ingot ◽  
Side Wall ◽  
Solidification Process ◽  
Unidirectional Solidification ◽  
Finite Element Software ◽  
Solidification Processes

In this paper, by using the commercial finite-element software of ProCAST, unidirectional solidification processes in 23t steel ingot were simulated. Emphasis is placed on analysis of required time for complete solidification of steel ingot and temperature distribution about ingot and side wall during the solidification process. By comparing simulation values and measured values of side wall during the solidification process, the simulated results conclusively demonstrate that our developed model is feasible and valuable.

Optimization of Process Parameters for Unidirectional Solidification of Magnesium Alloy

2013 ◽  
Vol 750 ◽  
pp. 228-231
Author(s):  
Ming Chen ◽  
Xiao Dong Hu ◽  
Hong Yang Zhao ◽  
Dong Ying Ju
Keyword(s):  
Magnesium Alloy ◽  
Temperature Gradient ◽  
Process Parameters ◽  
Solidification Process ◽  
Optical Microscope ◽  
Field Method ◽  
Unidirectional Solidification ◽  
Grain Structure ◽  
Phase Field Method ◽  
Gradient Distribution

The unidirectional solidification process of magnesium alloy needs to establish a specific temperature gradient in casting mold, the direction of crystal growth and heat flow are in the opposite direction in the unidirectional solidification. The process can better control the grain orientation, and eliminate the horizontal grain boundary, so to attain columnar grain structure and excellent performance of magnesium alloy. In this paper, Numerical simulation is carried out by orthogonal experiments in order to obtain the optimal process parameters according to the actual experimental device. Different process parameters are taken into account, including pulling speed, cooling time and cooling intensity. FEM (finite element method) is employed to calculate the temperature field and reached a straight shape of temperature gradient distribution which is conductive to achieve unidirectional solidification microstructure. PFM(phase field method) is adopted into the microstructure calculation. The microstructure obtained by PFM is in agreement with the actual pattern by the optical microscope observation.

Transient Numerical Analysis of Different Finned Tube Designs for Use in Latent Heat Thermal Energy Storage Devices

2015 ◽  
Author(s):  
Anton Beck ◽  
Martin Koller ◽  
Heimo Walter ◽  
Michael Hameter
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Numerical Analysis ◽  
Numerical Investigation ◽  
Sodium Nitrate ◽  
Solidification Process ◽  
Melting Process ◽  
Finned Tube ◽  
Heat Transfer Mechanism ◽  
Melting And Solidification

In this paper the results of a numerical investigation of the melting and solidification process of sodium nitrate, which is used as phase change material, will be presented. For the heat transfer to the sodium nitrate different finned tube designs, namely helical-, transversal- and longitudinal finned tubes, are used. The numerical results of the melting and solidification process for the different design cases will be compared. The numerical analysis of the melting process has shown that apart from the first period of the charging process natural convection is the dominant heat transfer mechanism. The numerical analysis of the melting process has also shown that for a fast melting process heat exchanger tubes should be designed in such a way that an unrestricted natural convection is guaranteed. The numerical investigation for the solidification process has shown that the dominant heat transfer mechanism is heat conduction. The investigation has also shown that the solidification front grows more uniformly from the tube surface to the outer shell compared to the melting front. Therefore no significant differences between the different tube designs are detected concerning the solidification process.

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