scholarly journals Research on Descaling Characteristics and Simulation Calculation of a Coaxial High-Frequency Electronic Descaling Device

Water ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 789
Author(s):  
Yan Zhao ◽  
Lixin Zhang ◽  
Xin Zhao ◽  
Jin Liu ◽  
Ming Gao
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Magnetic Flux ◽  
High Frequency ◽  
Field Energy ◽  
Wave Excitation ◽  
Magnetic Field Energy ◽  
High Frequency Electromagnetic Field ◽  
The Magnetic Field ◽  
Peak Value

High-frequency electronic descaling devices are physical water treatment methods that use a high-frequency electromagnetic field to prevent and remove scale. The effectiveness of the method is verified by monitoring the growth of scale on the surface of heat exchange tubes. The microstructure of scale obtained from experiments is analyzed by scanning electron microscope (SEM), and the action characteristics of high-frequency electromagnetic fields on water are explored by observing the change of solution contact angle at different times. The experimental results show that the high-frequency electromagnetic field can slow down the scaling growth on the surface of heat exchange tubes by changing the morphology of scaling substances and the physicochemical properties of water. The cavity of the instrument is modeled and simulated by ANSYS Maxwell, and the three operating parameters, waveform, voltage and frequency, are changed respectively. The performance parameters of the cavity, such as magnetic field energy, electric field energy and magnetic flux, are calculated and compared, and then the more suitable operating parameters are selected to improve the performance of the instrument. The simulation results show that the high-frequency electromagnetic field generated by the anode rod in the axial position can be overlooked compared with the magnetic field energy. Square wave excitation produces greater magnetic field energy than using sine wave excitation, and as the voltage increases, the peak value of the magnetic field energy continues to rise and increases faster. With an increase in the frequency, the peak value of the magnetic field energy and magnetic flux peak will maintain a slight decrease over a certain frequency range. After this frequency range, the peak value of magnetic field energy and magnetic flux peak will decrease rapidly. This decrease is due to the relaxation caused by the change of the waveform direction. The influence of time and an increase in the frequency will significantly increase the influence of the relaxation time.

scholarly journals PRESSURE OF DEGENERATE AND RELATIVISTIC ELECTRONS IN A SUPERHIGH MAGNETIC FIELD

2013 ◽  
Vol 28 (36) ◽  
pp. 1350138 ◽  
Author(s):  
ZHI FU GAO ◽  
NA WANG ◽  
QIU HE PENG ◽  
XIANG DONG LI ◽  
YUAN JIE DU
Keyword(s):  
Magnetic Field ◽  
Oblate Spheroid ◽  
Field Energy ◽  
Relativistic Electrons ◽  
Positive Contribution ◽  
High Electron ◽  
Electron Pressure ◽  
Magnetic Field Energy ◽  
Qed Effects ◽  
The Magnetic Field

Based on our previous work, we deduce a general formula for pressure of degenerate and relativistic electrons, Pe, which is suitable for superhigh magnetic fields, discuss the quantization of Landau levels of electrons, and consider the quantum electrodynamic (QED) effects on the equations of states (EOSs) for different matter systems. The main conclusions are as follows: Pe is related to the magnetic field B, matter density ρ, and electron fraction Ye; the stronger the magnetic field, the higher the electron pressure becomes; the high electron pressure could be caused by high Fermi energy of electrons in a superhigh magnetic field; compared with a common radio pulsar, a magnetar could be a more compact oblate spheroid-like deformed neutron star (NS) due to the anisotropic total pressure; and an increase in the maximum mass of a magnetar is expected because of the positive contribution of the magnetic field energy to the EOS of the star.

scholarly journals New Superconductivity and Theoretical Study on a New Phenomenon of Energy Source with Assistance of Initial Experiments

2018 ◽  
Author(s):  
Shinichi Ishiguri
Keyword(s):  
Magnetic Field ◽  
Energy Source ◽  
Electrostatic Field ◽  
Theoretical Study ◽  
Depletion Layer ◽  
Field Energy ◽  
Magnetic Field Energy ◽  
New Type ◽  
The Magnetic Field ◽  
A Current

We previously reported new superconductivity produced by an electrostatic field and a diffusion current in a semiconductor without refrigeration. In particular, the superconductivity was investigated theoretically and confirmed experimentally. Here, we determine that the derived superconducting quantum state can be reproduced in a capacitor. When circuits are formed with this new-type capacitor and diodes, a magnetic field is applied to the diodes’ depletion layer. The depletion layer is biased because of the conversion from the magnetic-field energy to electric-field energy, resulting in the diodes’ spontaneously emitting a current. Thus, the new-type capacitor is charged using no other energy source. This new phenomenon is described theoretically with assistance of initial experiments.

scholarly journals Generation of Magnetic Fields and Electric Currents in the Solar Photosphere

1990 ◽  
Vol 138 ◽  
pp. 273-277
Author(s):  
J.C. Henoux ◽  
B.V. Somov
Keyword(s):  
Magnetic Field ◽  
Radial Dependence ◽  
Field Energy ◽  
Solar Photosphere ◽  
Fluid Approximation ◽  
Flux Tubes ◽  
Magnetic Field Energy ◽  
Field Energy Density ◽  
Dc Current ◽  
The Magnetic Field

Velocities of electrons, ions and neutrals are computed in the three-fluid approximation for an axisymmetrical magnetic field. By prescribing a radial dependence of the velocity of neutrals in agreement with a downflow, the radial dependence of the magnetic field energy density is derived for a given set of values of the magnetic field at the central and external boundaries. Flux-tube cooling by advection of ionization energy is found to be significant. Vortices in the low photosphere could produce significant electric power and DC current intensity along the coronal magnetic lines of forces. The velocities of neutrals, the size and the number of flux-tubes required to power flares in plage regions, are estimated.

scholarly journals The flux compression generator load parameters selection

2019 ◽  
Vol 28 ◽  
pp. 01002
Author(s):  
Mirosław Wołoszyn ◽  
Daniel Kowalak ◽  
Kazimierz Jakubiuk ◽  
Mikołaj Nowak
Keyword(s):  
Magnetic Field ◽  
Gain Factor ◽  
Current Gain ◽  
Field Energy ◽  
Simulation Research ◽  
Magnetic Field Energy ◽  
Flux Compression ◽  
Parameters Selection ◽  
Simulation Results ◽  
The Magnetic Field

Computer simulation results of the flux compression generator (FCG) loaded with an inductor has been presented in this paper. Simulation research has been performed in order to select the parameters of FCG load coil properly. The influence of the load inductance and resistance on the current gain factor and the magnetic field energy accumulated in a load coil has been investigated.

Characteristics of 3D magnetic field of magnetic coupling resonant wireless power transmission system

2017 ◽  
Vol 36 (6) ◽  
pp. 1806-1818 ◽  
Author(s):  
Xian Zhang ◽  
Zhaoyang Yuan ◽  
Yang Qingxin ◽  
Zhaohui Wang ◽  
Hao Meng ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Magnetic Flux ◽  
Field Measurement ◽  
Power Transmission ◽  
Magnetic Coupling ◽  
Magnetic Flux Density ◽  
Wireless Power ◽  
Content Type ◽  
The Magnetic Field

Purpose The purpose of the paper is to analyze the impact of coupling on the distribution of the magnetic field and study the characteristics of the magnetic flux density in the transmission process of the magnetic coupling resonant wireless power transmission (MCR-WPT) system, which provides guidance on the design of the WPT system. Design/methodology/approach In this study, a finite element simulation analysis was conducted and a three-dimensional (3D) electromagnetic field measurement platform was used. Findings It is shown that the distribution of the magnetic field, as well as the position of maximum magnetic flux density, will change when the coils are coupled. The simulation results of the magnetic field distribution, as well as the transmission performance, are different from those in practice. It cannot describe the actual performance of WPT system. Originality/value A 3D electromagnetic field measurement system and the host computer software are designed to help optimize the simulation and carry out more accurate and efficient research. The 3D electromagnetic field measurement system can be used to study the distribution of the spatial electromagnetic field, influencing factor, exposure and interoperability between different coils.

Effects of High Frequency Electromagnetic Field on Improving Macro/Micro Structure and Reducing Segregation for Aluminium Alloy Billets

2006 ◽  
Vol 519-521 ◽  
pp. 1759-1764
Author(s):  
Hai Hao ◽  
Xing Guo Zhang ◽  
Joon Pyo Park ◽  
Ho Young Kim ◽  
Shan Yao ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
High Frequency ◽  
Direct Chill ◽  
Mg Alloy ◽  
Cast Billet ◽  
Micro Structure ◽  
High Frequency Electromagnetic Field ◽  
Chill Cast ◽  
Direct Chill Cast

By imposing a high frequency magnetic field, the surface quality and macro/micro structure of the direct chill cast billets are improved. The casting speed can also be improved by simultaneous applying mold and electromagnetic coil, especially for the alloys with a wide freezing range such as Al-Cu-Mg alloy. The extent of macrosegregation in the Al-Cu-Mg alloy is reduced by application of the magnetic field. Moreover, the inverse segregation layer usually observed in the direct chill cast billet is eliminated by the effect of the electromagnetic field. The microstructure of the hot-rolled and heat treated billets cast under the high frequency field also show better characteristics.

scholarly journals Results of application of frequency resonance therapy for treatment of cow mastitis

2020 ◽  
Vol 17 ◽  
pp. 00254
Author(s):  
Victor E. Lyubimov ◽  
Dmitry V. Romanov ◽  
Yuri A. Tsoi ◽  
Bulat G. Ziganshin ◽  
Farit F. Sitdikov
Keyword(s):  
Electromagnetic Field ◽  
High Frequency ◽  
Prolonged Exposure ◽  
Cow Milk ◽  
Field Energy ◽  
Alveolar Cells ◽  
Cellular Mechanisms ◽  
High Frequency Electromagnetic Field ◽  
Milking Machine ◽  
The Impact

The physiological aspects of the implementation of the cow milk transfer reflex during machine milking are the result of exposure to the threshold force of a given value of a variable vacuum and simultaneous mechanical irritation by the teat rubber of the udder of the cow udder system. This effect leads to the discovery of sphincters with the subsequent release of the hormone oxytocin by the pituitary gland and the milk accumulation from the alveolar udder tissue. Signal environmental factors (sounds of a vacuum pump, milking machines, feeder) cause reactions in cows not only by irritation but also by frequency. It has been established that exposure to a high-frequency electromagnetic field destroys most of the common causative agents of mastitis-staphylococci, streptococci. For the treatment of mastitis, stimulation of lactation and the reflex of milk flow in cows, it is promising to apply the effect of a high frequency electromagnetic field modulated by radio frequencies, which contribute to the conversion of electromagnetic field energy into energy of nerve impulses and chemical reactions of mitochondrial cellular mechanisms of udder alveolar tissue cells. The use of alternating sets of specific frequencies of a modulating electromagnetic field of high frequency allows the alternation of “killer” frequencies for microbes with stimulating secretion of alveolar cells of the udder and with frequencies that act anti-inflammatory. It is essential to determine the frequencies that create protective inhibition from exposure to extreme irritations of milking factors (increased vacuum, durable worn nipple rubber). With prolonged exposure to an electromagnetic field, such frequencies a repeating conditioned stimulus of a weak strength, which precede and accompany the impact of the milking machine, and stimulate the activity of the nerve centers of the milk yield reflex in cows, creating a dominant lactation.

Tearing instability inside a 2D current sheet with a normal magnetic field

2021 ◽  
Author(s):  
Chen Shi ◽  
Anton Artemyev ◽  
Marco Velli ◽  
Anna Tenerani
Keyword(s):  
Magnetic Field ◽  
Magnetic Reconnection ◽  
Current Sheet ◽  
Normal Component ◽  
Field Energy ◽  
Tearing Mode ◽  
Magnetic Field Energy ◽  
Tearing Instability ◽  
The Magnetic Field ◽  
Normal Magnetic Field

<p>Magnetic reconnection converts the magnetic field energy into thermal and kinetic energies of the plasma. This process usually happens at extremely fast speed and is therefore believed to be a fundamental mechanism to explain various explosive phenomena such as coronal mass ejections and planetary magnetospheric storms. How magnetic reconnection is triggered from the large magnetohydrodynamic (MHD) scales remains an open question, with some theoretical and numerical studies showing the tearing instability to be involved. Observations in the Earth’s magnetotail and near the magnetopause show that a finite normal magnetic field is usually present inside the reconnecting current sheet. Besides, such a normal field may also exist in the solar corona. However, how this normal magnetic field modifies the tearing instability is not thoroughly studied. Here we discuss the linear tearing instability inside a two-dimensional current sheet with a normal component of magnetic field where the magnetic tension force is balanced by ion flows parallel and anti-parallel to the magnetic field. We solve the dispersion relation of the tearing mode with wave vector parallel to the reconnecting magnetic field. Our results confirm that the finite normal magnetic field stabilizes the tearing mode and makes the mode oscillatory instead of purely growing.</p>

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