scholarly journals Comment on “Electric current induced flow of liquid metals: Mechanism and substrate-surface effects” [J. Appl. Phys. 115, 044915 (2014)]

2017 ◽  
Vol 121 (13) ◽  
pp. 136102 ◽  
Author(s):  
Z. J. Zhang ◽  
M. L. Huang ◽  
N. Zhao
Keyword(s):  
Electric Current ◽  
Liquid Metals ◽  
Substrate Surface ◽  
Surface Effects ◽  
Induced Flow

scholarly journals Geometrical Platform of Big Database Computing for Modeling of Complex Physical Phenomena in Electric Current Treatment of Liquid Metals

Data ◽  
2019 ◽  
Vol 4 (4) ◽  
pp. 136 ◽  
Author(s):  
Yuriy Zaporozhets ◽  
Artem Ivanov ◽  
Yuriy Kondratenko
Keyword(s):  
Big Data ◽  
Electric Current ◽  
Data Transfer ◽  
Liquid Metals ◽  
Equation System ◽  
Multiscale Simulation ◽  
Current Treatment ◽  
Matrix Transformations ◽  
Practical Case ◽  
Hydrodynamic Wave

According to the principles of multiphysical, multiscale simulation of phenomena and processes which take place during the electric current treatment of liquid metals, the need to create an adjustable and concise geometrical platform for the big database computing of mathematical models and simulations is justified. In this article, a geometrical platform was developed based on approximation of boundary contours using arcs for application of the integral equations method and matrix transformations. This method achieves regular procedures using multidimensional scale matrices for big data transfer and computing. The efficiency of this method was verified by computer simulation and used for different model contours, which are parts of real contours. The obtained results showed that the numerical algorithm was highly accurate based on the presented geometrical platform of big database computing and that it possesses a potential ability for use in the organization of computational processes regarding the modeling and simulation of electromagnetic, thermal, hydrodynamic, wave, and mechanical fields (as a practical case in metal melts treated by electric current). The efficiency of this developed approach for big data matrices computing and equation system formation was displayed, as the number of numerical procedures, as well as the time taken to perform them, were much smaller when compared to the finite element method used for the same model contours.

Changes in Stress and Microstructure in Sputter Deposited Copper Films Due to Substrate Surface Effects

2002 ◽  
Vol 404-407 ◽  
pp. 691-696 ◽  
Author(s):  
B. Okolo ◽  
P. Lamparter ◽  
U. Welzel ◽  
T. Wagner ◽  
Eric J. Mittemeijer
Keyword(s):  
Substrate Surface ◽  
Surface Effects ◽  
Copper Films ◽  
Sputter Deposited

scholarly journals Direct Generation of Electric Currents from Flowing Neutral Ionic Solutions

2013 ◽  
Vol 2013 ◽  
pp. 1-4
Author(s):  
Boyang Wang
Keyword(s):  
High Pressure ◽  
Electric Current ◽  
Applied Pressure ◽  
New Method ◽  
Electric Currents ◽  
Ionic Solutions ◽  
Atomic Masses ◽  
Induced Flow ◽  
Direct Generation ◽  
Flow Velocities

We have discovered a new method of generating electric currents, directly from high pressure-induced flow of neutral ionic solutions. The mechanism is that the cations and anions have different flow velocities, if their atomic masses are dramatically different, due to different accelerations generated from the high applied pressure. The generated electric current is very sensitive to the strengths of the applied pressure, and it might be potentially used for detection of atomic masses and pressures.

scholarly journals Structural and optical properties of Al-doped ZnO thin films produced by magnetron sputtering

2020 ◽  
Vol 14 (2) ◽  
pp. 119-127
Author(s):  
Queiroz de ◽  
Azevedo de ◽  
Medeiros de ◽  
Igor Nascimento ◽  
Souza de ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Magnetron Sputtering ◽  
Electric Current ◽  
Near Infrared ◽  
Substrate Surface ◽  
Visible Spectrum ◽  
Average Crystallite Size ◽  
Experimental Results ◽  
Doped Zno

Experimental and theoretical investigations of the structure and optical properties of Al-doped ZnO (AZO) thin films produced by magnetron sputtering under different values of electric current were conducted. The XRD results confirm the formation of the AZO thin films with hexagonal wurtzite structure, with preferential orientation along the crystallographic plane (002), direction c. The increment of electric current allowed an increase in average crystallite size. The FE-SEM and AFM images analyses of the AZO films revealed the occurrence of nucleation on the substrate surface that formed films with granular and rough structure. The higher substrate temperature caused by the higher value of electric current had influence on the grain size and thickness (ranging from 974 to 1500 nm) of the formed thin films. Due to the high absorption of free carriers, the optical transmittance of the AZO films was acceptable for the visible spectrum and limited to the near infrared region. The energy band gap values for both AZO films, measured from the optical transmission spectra, were ideal for semiconductor applications. The ab initio calculations using DFT and the method LSDA + U along with the correction of Hubbard were successfully applied to investigate the structural and optical effects. The band structures of the pure ZnO and ZnO:Al, calculated in this work, presented Eg values close to the experimental results. Therefore, these results imply that our methods are reliable and that the calculations are in accordance with the experimental results.

Rhodamine B-containing silica films from TEOS precursor: Substrate surface effects detected by photoluminescence

2007 ◽  
Vol 601 (4) ◽  
pp. 1118-1122 ◽  
Author(s):  
Alison Abreu da Silva ◽  
Juliana Flor ◽  
Marian Rosaly Davolos
Keyword(s):  
Rhodamine B ◽  
Substrate Surface ◽  
Surface Effects ◽  
Silica Films

An Assessment of the Influence of Environmental Factors on Cavitation Instabilities

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
Damien T. Kawakami ◽  
A. Fuji ◽  
Y. Tsujimoto ◽  
R. E. A. Arndt
Keyword(s):  
Surface Effects ◽  
Dominant Frequency ◽  
Gas Content ◽  
Numerical Code ◽  
Repetitive Nature ◽  
Composite Parameter ◽  
Induced Flow ◽  
Cavity Shedding ◽  
Cavitation Behavior

Cavitation induced flow instabilities are of interest in numerous applications. Experimental and numerical investigations of this phenomenon are taking place at several institutions around the world. Although there is qualitative agreement among the numerous recent papers on the subject, there is a lack of agreement with regard to important details, such as the spectral content of unsteady lift oscillations. This paper summarizes observations of a cavitating NACA0015 foil in three different tunnels that revealed remarkably different cavity shedding appearances and behaviors. Some of the differences were attributed to system instabilities. However, in addition to a different cavitation behavior attributed to system instabilities, it was found that differences in gas content could significantly alter the lift spectrum of a cavitating foil. For a certain range of the composite parameter σ∕2α near 4, the dominant frequency appears to double when the gas content is reduced by a half. It is also argued that surface effects can have a significant influence on fully wetted time during cavity shedding. Normally, surface effects are assumed to play an important role in the initial inception of a fully wetted hydrofoil with gas content being the primary factor governing developed cavitation behavior. However, the repetitive nature of the process implies that each shedding cycle is an individual inception process. Hence, the unexpected role of surface effects in partially cavitating hydrofoils. The conclusions reached have important ramifications concerning numerical code verification that is a topic of major concern.

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