scholarly journals Influences of Alternating Magnetic Fieldson the Growth Behavior and Distribution of the Primary Fe Phasein Cu-14Fe Alloys during the Solidification Process

Metals ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 571 ◽  
Author(s):  
Jin Zou ◽  
De-Ping Lu ◽  
Ke-Ming Liu ◽  
Qing-Feng Fu ◽  
Zhe Zhou
Keyword(s):  
Magnetic Field ◽  
Growth Process ◽  
Solidification Process ◽  
Growth Behavior ◽  
Solidification Structure ◽  
Combined Effects ◽  
Electromagnetic Parameter ◽  
Grain Distribution ◽  
Hole Defects ◽  
Spherical Grains

An alternating magnetic field (AMF) was applied during the solidification process of the Cu-14Fe alloy and the effect of the electromagnetic parameter, which impact the model and solidification technique of the solidification structure that were analyzed. Results show that an AMF applied during the solidification process significantly reduced macro-segregation and gas hole defects. During the growth process of the primary Fe phase, the AMF impacted the nucleation of detached grains and fusing dendrites. Specifically, the developed Fe dendrites were transformed to rosettes or spherical grains in the presence of an applied AMF while the grain distribution was more disperse and uniform. It was found that the growth behavior of Fe grains under AMF depended upon the combined effects of the electromagnetic force and electromagnetic heat.

Non-linearity in combined effects of ELF magnetic field and amphetamine on motor activity in rats

2004 ◽  
Vol 150 (1-2) ◽  
pp. 223-227 ◽  
Author(s):  
Vesna Pešić ◽  
Branka Janać ◽  
Ankica Jelenković ◽  
Vasily Vorobyov ◽  
Zlatko Prolić
Keyword(s):  
Magnetic Field ◽  
Motor Activity ◽  
Combined Effects ◽  
Elf Magnetic Field

scholarly journals R-Process Nucleosynthesis in MHD Jet Explosions of Core-Collapse Supernovae

2013 ◽  
Vol 2013 ◽  
pp. 1-13
Author(s):  
Motoaki Saruwatari ◽  
Masa-aki Hashimoto ◽  
Ryohei Fukuda ◽  
Shin-ichiro Fujimoto
Keyword(s):  
Magnetic Field ◽  
Heavy Element ◽  
Initial Conditions ◽  
Core Collapse ◽  
Combined Effects ◽  
Two Dimensional ◽  
The Third ◽  
R Process ◽  
Helium Star ◽  
Hydrodynamic Code

We investigate the r-process nucleosynthesis during the magnetohydrodynamical (MHD) explosion of a supernova in a helium star of 3.3 M⊙, where effects of neutrinos are taken into account using the leakage scheme in the two-dimensional (2D) hydrodynamic code. Jet-like explosion due to the combined effects of differential rotation and magnetic field is able to erode the lower electron fraction matter from the inner layers. We find that the ejected material of low electron fraction responsible for the r-process comes out from just outside the neutrino sphere deep inside the Fe-core. It is found that heavy element nucleosynthesis depends on the initial conditions of rotational and magnetic fields. In particular, the third peak of the distribution is significantly overproduced relative to the solar system abundances, which would indicate a possible r-process site owing to MHD jets in supernovae.

scholarly journals Liquid Metal Flow Under Traveling Magnetic Field—Solidification Simulation and Pulsating Flow Analysis

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 532
Author(s):  
Evgeniy Shvydkiy ◽  
Egbert Baake ◽  
Diana Köppen
Keyword(s):  
Magnetic Field ◽  
Liquid Metal ◽  
Neutron Radiography ◽  
Metal Flow ◽  
Flow Analysis ◽  
Solidification Process ◽  
Electromagnetic Stirring ◽  
Pulsation Frequency ◽  
Conductive Liquid ◽  
Traveling Magnetic Field

Non steady applied magnetic field impact on a liquid metal has good prospects for industry. For a better understanding of heat and mass transfer processes under these circumstances, numerical simulations are needed. A combination of finite elements and volumes methods was used to calculate the flow and solidification of liquid metal under electromagnetic influence. Validation of numerical results was carried out by means of measuring with ultrasound Doppler velocimetry technique, as well as with neutron radiography snapshots of the position and shape of the solid/liquid interface. As a result of the first part of the work, a numerical model of electromagnetic stirring and solidification was developed and validated. This model could be an effective tool for analyzing the electromagnetic stirring during the solidification process. In the second part, the dependences of the velocity pulsation amplitude and the melt velocity maximum value on the magnetic field pulsation frequency are obtained. The ability of the pulsating force to develop higher values of the liquid metal velocity at a frequency close to the MHD resonance was found numerically. The obtained characteristics give a more detailed description of the electrically conductive liquid behaviour under action of pulsating traveling magnetic field.

Sign in / Sign up

Export Citation Format

Share Document