scholarly journals Numerical Simulation on the Transient Temperature Field of Anode Rodding in Aluminium Reduction Cells

Metals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1026
Author(s):  
Tuofu Li ◽  
Wenju Tao ◽  
Zhaowen Wang ◽  
Xiaozhen Liu ◽  
Jianfeng Hou
Keyword(s):  
Temperature Field ◽  
Cast Iron ◽  
Cooling Rate ◽  
Element Model ◽  
Temperature Fields ◽  
Transient Temperature ◽  
Solidification Mode ◽  
Shrinkage Cavities ◽  
Transient Thermal ◽  
Bottom To Top

The temperature field of the anode rodding process is the root of most of problems related to the anode. A 3D transient thermal finite element model was developed, based on ANSYS in this paper. The temperature field of the rodding process was investigated using this model. The results were presented and analyzed in detail, including the transient temperature fields of different components in the anode, the characteristics of the cast iron solidification, and the cooling rate distribution. The conclusions were as follows. When the stub hole was filled up at 10 s, 30% by volume of cast iron was below the liquidus temperature. At 70 s, the cast iron solidified completely. The cast iron close to the stub solidified prior to that close to the carbon. The solidification mode was intermediate-freezing. The solidifying sequence was vertically from bottom to top, indicating that shrinkage cavities were less likely to occur. The temperature of the stub was higher than the carbon, and portion at high temperature was concentrated around the stub hole. The cooling rate during solidification was 4.3 °C s−1 to 43.7 °C s−1, and the gradient on the radial direction was relatively obvious.

Model Development of the Application of Finite Element – Eigenvalue Method to the Determination of Transient Temperature Field in Functionally Graded Materials

2007 ◽  
Vol 18-19 ◽  
pp. 253-261
Author(s):  
John A. Akpobi ◽  
C.O. Edobor
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Functionally Graded Materials ◽  
Model Development ◽  
Element Model ◽  
Steady State Solution ◽  
Functionally Graded ◽  
Transient Temperature ◽  
Graded Materials ◽  
Eigenvalue Method

In this paper, a finite elment-eigenvalue method is formulated to solve the finite element models of time dependent temperature field problems in non-homogeneous materials such as functionally graded materials (FGMs). The method formulates an eigenvalue problem from the original finite element model and proceeds to calculate the associated eigenvectors from which the solution can be obtained. The results obtained highly accurate and are exponential functions of time which when compared with the exact solution tended fast to the steady state solution.

Thermomechanical Design of a Heat Exchanger for a Recuperative Aeroengine

2006 ◽  
Vol 128 (4) ◽  
pp. 736-744 ◽  
Author(s):  
Harald Schoenenborn ◽  
Ernst Ebert ◽  
Burkhard Simon ◽  
Paul Storm
Keyword(s):  
Thermal Analysis ◽  
Heat Exchanger ◽  
Boundary Conditions ◽  
Stress Analysis ◽  
Element Model ◽  
Automatic Generation ◽  
Temperature Fields ◽  
Transient Temperature ◽  
Engine Operation ◽  
Aero Engines

Within the framework programs of the EU for Efficient and Environmentally Friendly Aero-Engines (EEFEA) MTU has developed a highly efficient cross-counter flow heat exchanger for the application in intercooled recuperated aeroengines. This very compact recuperator is based on the profile tube matrix arrangement invented by MTU and one of its outstanding features is the high resistance to thermal gradients. In this paper the combined thermomechanical design of the recuperator is presented. State-of-the-art calculation procedures for heat transfer and stress analysis are combined in order to perform a reliable life prediction of the recuperator. The thermal analysis is based upon a 3D parametric finite element model generation. A program has been generated, which allows the automatic generation of both the material mesh and the boundary conditions. Assumptions concerning the boundary conditions are presented as well as steady state and transient temperature results. The stress analysis is performed with a FEM code using essentially the same computational grid as the thermal analysis. With the static temperature fields the static loading of the profile tubes is determined. From transient thermal calculations successive 3D temperature fields are obtained which enable the determination of creep life and LCF life of the part. Finally, vibration analysis is performed in order to estimate the vibration stress of the profile tubes during engine operation. Together with the static stress a Goodman diagram can be constructed. The combined analysis shows the high life potential of the recuperator, which is important for economic operation of a recuperative aero-engine.

Study on Key Factors in Piston Transient Temperature Field

2013 ◽  
Vol 779-780 ◽  
pp. 958-964
Author(s):  
You Liu ◽  
Jing Jing Liu ◽  
Xiao Chen
Keyword(s):  
Temperature Field ◽  
Boundary Conditions ◽  
Theoretical Foundation ◽  
Element Model ◽  
Test Point ◽  
Transient Temperature ◽  
Feature Points ◽  
Key Factors ◽  
Transient Temperature Field ◽  
Transient Numerical Simulation

By means of ANSYS, piston finite element model is constructed to attain transient numerical simulation and explore the characteristics of surface temperature. On the basis of experimental design, the correlation is analyzed between major boundary conditions and temperature of feature points, thus revealing the corresponding correlation of quantity. Transient calculation method is proved to be scientific and paves way to defining boundary conditions. And furthermore there forms a theoretical foundation for positioning test point in piston temperature field.

scholarly journals Experimental and Numerical Assessment of Temperature Field and Analysis of Microstructure and Mechanical Properties of Low Power Laser Annealed Welded Joints

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1514 ◽  
Author(s):  
Uday Kumar ◽  
D. Gope ◽  
J. Srivastava ◽  
Somnath Chattopadhyaya ◽  
A. Das ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Temperature Field ◽  
Low Power ◽  
Weld Zone ◽  
Element Model ◽  
Temperature Fields ◽  
Bead Geometry ◽  
Weld Bead Geometry ◽  
Microstructure And Mechanical Properties ◽  
Numerical Assessment

In this present work, laser welding experiments were carried out on 1 mm thin Ti6Al4V sheets using a low power Nd-YAG laser machine without using any filler wire and without edge preparation of welding specimens. The influence of different major process control parameters such as welding speed and power on the yield parameters like temperature field, weld bead geometry, microstructure, and mechanical properties are critically investigated. Experimental results are compared in detail with the simulated results obtained using a commercial 3D finite element model. In the simulation model, temperature-dependent thermal and mechanical properties of plates were considered. The temperature readings were recorded with the aid of K type thermocouples. Forced convection has been assumed near weld zone region because of the movement of the shielding gas. Appreciable agreement is found between the experimental and the simulated temperature fields in most of the cases with few exceptions. These deviations on few occasions may be due to the presence of uncertainties inherently present in the experimental domain and uncertainties in the subsequent temperature sensing techniques by the thermocouples. In addition, annealing has been done at 950 °C, 980 °C, and 1010 °C for one selected parameter (192 W, 6 mm/s). The tensile strength of the samples annealed at 980 °C has been found to be 1048 MPa and it is 3% to 4% higher than that of the usual welded samples.

Analytical Solution of Transient Three-Dimensional Temperature Field in a Rotating Cylinder Subject to a Localized Laser Beam

2017 ◽  
Vol 139 (6) ◽  
Author(s):  
Mostafa M. Kashani ◽  
Mohammad R. Movahhedy ◽  
Mohammad T. Ahmadian ◽  
Reza Shoja Razavi
Keyword(s):  
Temperature Field ◽  
Analytical Solution ◽  
Analytical Model ◽  
Material Removal ◽  
Three Dimensional ◽  
Element Model ◽  
Rotating Cylinder ◽  
Transient Temperature ◽  
Analytical Scheme ◽  
Temperature Filed

Laser-assisted machining (LAM) is a growing trend in machining of hard to cut materials. In most experimental cases, LAM is carried out in two stages; first, laser and machine parameters are tuned to adjust the temperature at the material removal point (Tmr), and second, the cutting tool is engaged to cut the points that have already been heated by the laser. Alternatively, an analytical model for the prediction of temperature filed can replace lengthy experimentation needed for tuning the material removal temperature. This paper presents an analytical solution to the transient temperature field in a rotating cylinder subject to a localized laser heat source based on Green's functions. The analytical solution is validated by comparing the surface point temperatures to thermal experiments on DIN 1.7225 steel, which shows good agreement in trend and values. Furthermore, a finite element model is developed and verified by the results of the same experiments, providing a more detailed investigation on the performance of the analytical model. The developed analytical scheme can be used to readily calculate pointwise temperatures on workpiece surface and internal points which can be used as a tool for designing machining conditions.

Study on Unsteady Temperature Field of Diesel Engine Piston

2013 ◽  
Vol 779-780 ◽  
pp. 965-970
Author(s):  
You Liu ◽  
Jing Jing Liu ◽  
Xiao Chen
Keyword(s):  
Temperature Field ◽  
Temperature Fluctuation ◽  
Extreme Temperature ◽  
Temperature Fluctuations ◽  
Cold Start ◽  
Element Model ◽  
Unsteady Temperature ◽  
Unsteady Temperature Field ◽  
Calculate Temperature Field ◽  
Transient Thermal

The paper took the piston of 620 single-cylinder engine as an example,a finite element model of piston was built with the help of ANSYS software. Than to calculate temperature field and and quick cold start conditions respectively[1]. Through the periodic transient thermal analysis, temperature fluctuations on the surface of the piston were derived, which indicated that the surface contacted with gas was the main temperature fluctuation area. The max temperature fluctuation can be up to 20 ° C and the wild fluctuation occurred in a distance of 2 mm from the surface of the piston. Temperatures of the piston went up according to exponential rule during the course of quick cold start, Extreme temperature fluctuations will generate huge quasi-static thermal stress.

Analysis on the Temperature Field of Gear Form Grinding

2014 ◽  
Vol 633-634 ◽  
pp. 809-812
Author(s):  
Xiao Zhong Ren ◽  
Hai Feng Hu
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Element Model ◽  
Source Model ◽  
Helical Gear ◽  
Transient Temperature ◽  
Form Grinding ◽  
Transient Temperature Field ◽  
Study Results ◽  
Nonlinear Relation

Aiming at the issue on grinding burn of tooth face, the temperature field formed in helical gear form grinding was analyzed. The finite element model of the single tooth of helical gear was firstly established. Considering the nonlinear relation of the physical properties of gear material to temperature, 3D finite element simulation of transient temperature field was performed by using the rectangular moving heat source model. Finally, the temperature field distribution on tooth face was achieved. The study results show that the temperature is relative low when grinding starts, then the temperature increases rapidly, and the temperature reaches the maximum value at the end of grinding; the increase of grinding depth can result in the rise of temperature when other parameters are the constants.

scholarly journals Heat Transfer and Thermal Deformation Characteristics of Liquid-Cooled Laser Mirror

2014 ◽  
Vol 6 ◽  
pp. 749065 ◽  
Author(s):  
Panpan Hu ◽  
Haihong Zhu ◽  
Chongwen He ◽  
Xiaoming Ren
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Fluid Flow ◽  
Finite Volume ◽  
Thermal Deformation ◽  
Numerical Models ◽  
Element Model ◽  
Flow And Heat Transfer ◽  
Finite Volume Element ◽  
Transient Thermal

A coupled finite volume-element method is developed to simulate the transient thermal deformation of water-cooled mirror by considering fluid flow and convective heat transfer. The simulation process consists of two steps: the 3D finite volume models of fluid flow and heat transfer equation are solved to obtain the time-dependent temperature field by using CFD; then, the obtained temperature field used as final temperature field is unidirectionally coupled to the finite element model for solving the thermoplastic equation. It is concluded that fluid flow not only affects the magnitude of temperature rise and thermal deformation, but also affects the distribution of temperature and thermal deformation. The temperature gradient in the thickness direction ( z direction) is found to be much larger than that in transverse direction. It is found that the temperature and the consequent deformation of water-cooled mirror increase significantly in the first seconds and gradually become steady state in the subsequent time. Experiments are conducted to estimate the precision of numerical models, and the experimental results agree well with the simulated results.

Thermal Shock Behavior of a Functionally Graded Material Plate with a Crack

2013 ◽  
Vol 275-277 ◽  
pp. 152-155 ◽  
Author(s):  
Yan Yan Zhang ◽  
Li Cheng Guo ◽  
Feng Nan Guo ◽  
Hong Jun Yu ◽  
Kai Huang ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Functionally Graded Material ◽  
Functionally Graded ◽  
Temperature Fields ◽  
Transient Temperature ◽  
The Finite Element Method ◽  
Graded Material ◽  
Thermal Shock Behavior ◽  
Transient Thermal ◽  
Thermal Shock Problem

A thermal shock problem of a functionally graded material plane (FGMP) containing a crack is considered. All the material properties of the FGMP are assumed to be dependent on the coordinates.The transient temperature fields are solved by combining the finite difference method (FDM) and the finite element method (FEM). Then the transient thermal stress intensity factors (TSIFs) are obtained using the interaction energy integral method. The transient characteristics of the TSIFs are investigated.

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