Numerical Research on Magnetic Field, Temperature Field and Flow Field During Melting and Directionally Solidifying TiAl Alloys by Electromagnetic Cold Crucible

2017 ◽  
Vol 48 (6) ◽  
pp. 3345-3358 ◽  
Author(s):  
Ruirun Chen ◽  
Yaohua Yang ◽  
Xue Gong ◽  
Jingjie Guo ◽  
Yanqing Su ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Temperature Field ◽  
Flow Field ◽  
Cold Crucible ◽  
Tial Alloys ◽  
Field Temperature ◽  
Numerical Research

Magnetic field in a near-rectangular cold crucible designed for continuously melting and directionally solidifying TiAl alloys

2012 ◽  
Vol 212 (9) ◽  
pp. 1934-1940 ◽  
Author(s):  
Ruirun Chen ◽  
Jieren Yang ◽  
Hongsheng Ding ◽  
Feng Huang ◽  
Yanqing Su ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Cold Crucible ◽  
Tial Alloys

scholarly journals Research on the Electromagnetic-Heat-Flow Coupled Modeling and Analysis for In-Wheel Motor

2020 ◽  
Vol 11 (2) ◽  
pp. 29
Author(s):  
Haojie Xue ◽  
Di Tan ◽  
Shuaishuai Liu ◽  
Meng Yuan ◽  
Chunming Zhao
Keyword(s):  
Electromagnetic Field ◽  
Temperature Field ◽  
Flow Field ◽  
Weak Coupling ◽  
Working Condition ◽  
Electromagnetic Torque ◽  
Coupling Analysis ◽  
Field Coupling ◽  
Field Temperature ◽  
Coupling Factors

In this paper, a 15 KW in-wheel motor (IWM) is taken as the research object, and the coupling factors among the electromagnetic field, temperature field and flow field are analyzed, and the strong and weak coupling factors between the three fields are clarified, and by identifying the strong and weak coupling factors between the three fields, a three-field coupling analysis model for IWM with appropriate complexity is established, and the validity of the model is verified. In a certain driving condition, the electromagnetic field, temperature field and flow field characteristics of IWM are analyzed with the multi-field coupling model. The result shows that, after the IWM runs 8440 s under driving conditions, in this paper, the IWM electromagnetic torque of the rated working condition is 134.2 Nm, and IWM the electromagnetic torque of the peak working condition is 451.36 Nm, and the power requirement of the motor can be guaranteed. The highest temperature of the IWM is 150 °C, which does not exceed the insulation grade requirements of the motor (155 °C), the highest temperature of the permanent magnet (PM) is 65.6 °C, and it does not exceed the highest operating temperature of the PM, and ensures the accurate calculation of components loss and the temperature of the motor. It can be found, through research, that the electromagnetic torque difference between unidirectional coupling and bidirectional coupling is 3.2%, the maximum temperature difference is 7.98% in the three-field coupling analysis of IWM under rated working conditions. Therefore, it is necessary to consider the influence of coupling factors on the properties of motor materials when analyzing the electromagnetic field, temperature field and flow field of IWM; it also provides some reference value for the simulation analysis of IWM in the future.

Effect of External Magnetic Field on the Flow and Heat Transfer in DC Arc Plasma Torch

2010 ◽  
Vol 97-101 ◽  
pp. 2797-2800
Author(s):  
Da Pei Tang ◽  
Qing Gao ◽  
Ying Hui Li ◽  
Fan Xiu Lu
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Temperature Field ◽  
External Magnetic Field ◽  
Flow Field ◽  
Electric Field ◽  
Diamond Film ◽  
Plasma Torch ◽  
Current Intensity ◽  
Flow And Heat Transfer

A multiple fields’ coupled model of new magnetic controlled DC plasma torch, which was used for CVD diamond film, was presented. In this model, the effects of electric field and magnetic field on the flow field and temperature field were taken into account, and the fluid dynamics equations were modified by the addition of some source terms relating to electromagnetic field, such as Lorentz force, joule heating, and radiative cooling. Conversely, the generalized ohm’s law was used to solve the current density, which reflected the effects of flow field and temperature field on the electric field and magnetic field. In addition, the rest Maxwell’s equations and external solenoid magnetic field equation were also modeled. In order to know the effect of external magnetic field on the torch, the current intensity of external solenoid was chosen to simulate its influence on the flow and heat transfer in the torch. Results show that external magnetic field plays a part in stirring the plasma, which is advantageous for the preparation of diamond film. The larger the external solenoid current intensity is, the better the uniformity of the temperature and velocity of plasma is.

Analysis and Improvement on Acoustic Performance of Muffler with the Consideration of Temperature and Flow Velocity

2014 ◽  
Vol 875-877 ◽  
pp. 1143-1147
Author(s):  
Yi Xiang Hu ◽  
Shun Ming Li ◽  
Qing Liu
Keyword(s):  
Temperature Field ◽  
Flow Field ◽  
Flow Velocity ◽  
Output Power ◽  
Insertion Loss ◽  
Structural Parameters ◽  
Acoustic Fields ◽  
Influence Of Temperature ◽  
Acoustic Performance ◽  
Field Temperature

Aiming for the acoustic performance of expanded-muffler, the acoustic fields, flow field, temperature field and flow regenerated noise inside the expanded-muffler were studied. Furthermore, with the consideration of temperature and flow velocity, the influence of temperature and flow velocity on acoustic performance was obtained. Based on the research, the acoustic performance of an exhaust muffler was studied. By adjusting the structural parameters, without affecting the engine output power, the insertion loss of muffler has average increased by 5.1 dB (A).

scholarly journals Flow Field, Temperature Field, and Inclusion Removal in a New Induction Heating Tundish with Bent Channels

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 561 ◽  
Author(s):  
Fei Xing ◽  
Shuguo Zheng ◽  
Zonghui Liu ◽  
Miaoyong Zhu
Keyword(s):  
Temperature Field ◽  
Flow Field ◽  
Induction Heating ◽  
Flow Characteristics ◽  
Heating Power ◽  
Inclusion Removal ◽  
Good Efficiency ◽  
Heating Efficiency ◽  
Channel Radius ◽  
Field Temperature

In order to study the flow field, temperature field, and inclusion removal in a new induction heating tundish with bent channels, a three-dimensional (3D) transient mathematical model is established. The effects of both the channel radius and heating power on the multi-physical field and inclusion removal in the bent channels’ induction heating tundish are investigated. The results show that the tundish with the channel radius of 3 m shows better flow characteristics than those with the channel radii of 4 m and 2 m. With the increase of channel length, the heating efficiency increases at first, and then decreases, while the radius of 3 m is the best one for heating efficiency. After all the inclusions are placed into the tundish, the radii of 3 m and 2 m show good efficiency regarding inclusion removal, while it is poor when the radius is 4 m. Therefore, 3 m is the optimal radius of the channel in this work. Under the optimal channel radius, the heating power of 800 kW seems better than those of 600 kW and 1000 kW on flow characteristics control in the tundish. The temperature in the receiving chamber rises gradually and distributes quite uniformly with the increasing heating power, and the removal rate of inclusions increases with the increasing heating power.

Influence of rotating magnetic field on Maxwell saturated ferrofluid flow over a heated stretching sheet with heat generation/absorption

2019 ◽  
Vol 20 (5) ◽  
pp. 502 ◽  
Author(s):  
Aaqib Majeed ◽  
Ahmed Zeeshan ◽  
Farzan Majeed Noori ◽  
Usman Masud
Keyword(s):  
Magnetic Field ◽  
Temperature Field ◽  
Velocity Field ◽  
Differential Equations ◽  
Heat Transport ◽  
Viscous Dissipation ◽  
Heat Generation ◽  
Fluid Motion ◽  
Numerical Procedure ◽  
The Impact

This article is focused on Maxwell ferromagnetic fluid and heat transport characteristics under the impact of magnetic field generated due to dipole field. The viscous dissipation and heat generation/absorption are also taken into account. Flow here is instigated by linearly stretchable surface, which is assumed to be permeable. Also description of magneto-thermo-mechanical (ferrohydrodynamic) interaction elaborates the fluid motion as compared to hydrodynamic case. Problem is modeled using continuity, momentum and heat transport equation. To implement the numerical procedure, firstly we transform the partial differential equations (PDEs) into ordinary differential equations (ODEs) by applying similarity approach, secondly resulting boundary value problem (BVP) is transformed into an initial value problem (IVP). Then resulting set of non-linear differentials equations is solved computationally with the aid of Runge–Kutta scheme with shooting algorithm using MATLAB. The flow situation is carried out by considering the influence of pertinent parameters namely ferro-hydrodynamic interaction parameter, Maxwell parameter, suction/injection and viscous dissipation on flow velocity field, temperature field, friction factor and heat transfer rate are deliberated via graphs. The present numerical values are associated with those available previously in the open literature for Newtonian fluid case (γ 1 = 0) to check the validity of the solution. It is inferred that interaction of magneto-thermo-mechanical is to slow down the fluid motion. We also witnessed that by considering the Maxwell and ferrohydrodynamic parameter there is decrement in velocity field whereas opposite behavior is noted for temperature field.

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