Stationary regime of radially symmetric motion of laser heated vapors with temperature and ionization nonequilibrium taken into account

1974 ◽  
Vol 13 (4) ◽  
pp. 433-436
Author(s):  
S. P. Popov
Keyword(s):  
Stationary Regime ◽  
Symmetric Motion ◽  
Laser Heated ◽  
Ionization Nonequilibrium

Application of Mathematical Modeling during Monitoring and Optimization of Non-Stationary Regime of Oil Well

2016 ◽  
Vol 11 (1) ◽  
pp. 53-59
Author(s):  
A.S. Topolnikov
Keyword(s):  
Mathematical Modeling ◽  
Model Problem ◽  
Cylindrical Tube ◽  
Field Measurements ◽  
Stationary Flow ◽  
Stationary Regime ◽  
Oil Well ◽  
Time Duration ◽  
Typical Time ◽  
Radial Model

The paper presents results of modeling of periodical regime of oil well for the purpose of monitoring and optimization of its operation. To describe non-stationary flow in the reservoir a planar-radial model of filtration is employed. The flow of multiphase flux in the well elements (casing, tubing, annulus) is described by 1D Navier-Stoks equations. The pump work is modelled by specification of its rate-head curve. To estimate the typical time duration of the processes in the well and in the reservoir a solution of a model problem for cylindrical tube is given. Through the examples a solution of a problem of optimization of periodical regime of oil wells is demonstrated. The comparison with field measurements is presented.

scholarly journals Study of multicharged heavy ion generation from CO2 laser-produced plasma

1996 ◽  
Vol 14 (3) ◽  
pp. 347-368 ◽  
Author(s):  
V.Yu. Baranov ◽  
K.N. Makarov ◽  
V.C. Roerich ◽  
Yu.A. Satov ◽  
A.N. Starostin ◽  
...  
Keyword(s):  
Hadron Collider ◽  
Laser System ◽  
Heavy Ion ◽  
Ion Source ◽  
Lead Ion ◽  
Ion Generation ◽  
Wavelength Radiation ◽  
Laser Heated ◽  
Work Done ◽  
Power Densities

The results of lead ion generation with charge state from Pb10+ to Pb35+ from laser-heated plasma are presented. CO2 lasers producing 10.6-μm wavelength radiation at power densities in the range 4.1011-6.1014 W/cm2 in TBKI and CERN were used. Results of detailed numerical simulations presented in the paper are in good agreement with the experimental data. Work done in collaboration with CERN, ITEP, and TBKI was aimed at the specification of requirements for a laser system that will be able to drive an ion source for the hadron collider (LHC) at CERN.

scholarly journals Laser Floating Zone Growth: Overview, Singular Materials, Broad Applications, and Future Perspectives

Crystals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 38
Author(s):  
Francisco Rey-García ◽  
Rafael Ibáñez ◽  
Luis Alberto Angurel ◽  
Florinda M. Costa ◽  
Germán F. de la Fuente
Keyword(s):  
Equilibrium Phase ◽  
Polycrystalline Materials ◽  
Floating Zone ◽  
High Crystalline Quality ◽  
Experimental Parameters ◽  
Phase Selectivity ◽  
Oriented Polycrystalline ◽  
Laser Heated ◽  
Lfz Technique ◽  
Zone Growth

The Laser Floating Zone (LFZ) technique, also known as Laser-Heated Pedestal Growth (LHPG), has been developed throughout the last several decades as a simple, fast, and crucible-free method for growing high-crystalline-quality materials, particularly when compared to the more conventional Verneuil, Bridgman–Stockbarger, and Czochralski methods. Multiple worldwide efforts have, over the years, enabled the growth of highly oriented polycrystalline and single-crystal high-melting materials. This work attempted to critically review the most representative advancements in LFZ apparatus and experimental parameters that enable the growth of high-quality polycrystalline materials and single crystals, along with the most commonly produced materials and their relevant physical properties. Emphasis will be given to materials for photonics and optics, as well as for electrical applications, particularly superconducting and thermoelectric materials, and to the growth of metastable phases. Concomitantly, an analysis was carried out on how LFZ may contribute to further understanding equilibrium vs. non-equilibrium phase selectivity, as well as its potential to achieve or contribute to future developments in the growth of crystals for emerging applications.

scholarly journals Comparison of the thermal performance between conventional and cob building

2019 ◽  
Vol 111 ◽  
pp. 03003
Author(s):  
Kaoutar Zeghari ◽  
Hasna Louahlia ◽  
Malo Leguern ◽  
Mohamed Boutouil ◽  
Hamid Gualous ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Behaviour ◽  
Calculation Method ◽  
Building Materials ◽  
Residential Building ◽  
Local Heat ◽  
Energy Performance ◽  
Stationary Regime ◽  
Thermal Regulation ◽  
Climate Data

The appliance of sustainable development approach in building has urged construction industry to adopt proper measurements to protect environment and reduce residential building energy consumption and CO2 emissions. Thus, an increasing interest in alternative building materials has developed including the use of bio-based materials such as cob which is studied in this paper. In the previous work, many experimental and numerical studies have been carried out to characterize thermal behaviour of earth buildings, reduce its thermal conductivity and water content. In this paper, an experimental study is carried out to determine the thermal properties and energy performance of cob building. Cob samples within different soil and fiber contents are studied using an experimental set up instrumented with flux meters and micro-thermocouples in order to evaluate the local heat flux and thermal conductivity during stationary regime. The results are analysed and compared to deduce the performant mixes in terms of thermal behaviour while respecting the French thermal regulation. A static thermal simulation based on RT 2012 calculation method (the official French calculation method for the energy performance of new residential and commercial buildings according to France thermal regulation) is used to compare energy performance between conventional and cob building using the French climate data base .

Transient Temperature During the Vaporization of Liquid on a Pulsed Laser-Heated Solid Surface

1996 ◽  
Vol 118 (3) ◽  
pp. 702-708 ◽  
Author(s):  
H. K. Park ◽  
X. Zhang ◽  
C. P. Grigoropoulos ◽  
C. C. Poon ◽  
A. C. Tam
Keyword(s):  
Thin Film ◽  
Solid Surface ◽  
Elevated Temperatures ◽  
Bubble Nucleation ◽  
Transient Temperature ◽  
Specular Reflectance ◽  
Transient Temperature Field ◽  
Excimer Laser Pulse ◽  
Nanosecond Time Resolution ◽  
Laser Heated

The thermodynamics of the rapid vaporization of a liquid on a solid surface heated by an excimer laser pulse is studied experimentally. The transient temperature field is measured by monitoring the photothermal reflectance of an embedded thin film in nanosecond time resolution. The transient reflectivity is calibrated by considering a temperature gradient across the sample based on the static measurements of the thin film optical properties at elevated temperatures. The dynamics of bubble nucleation, growth, and collapse is detected by probing the optical specular reflectance. The metastability behavior of the liquid and the criterion for the onset of liquid–vapor phase transition in nanosecond time scale are obtained quantitatively for the first time.

Laser-heated pedestal growth of high Tc Bi-Sr-Ca-Cu-O superconducting fibers

1988 ◽  
Vol 91 (3) ◽  
pp. 318-330 ◽  
Author(s):  
D. Gazit ◽  
R.S. Feigelson
Keyword(s):  
High Tc ◽  
Laser Heated

Asymptotic solutions for a symmetric plasma under ionization nonequilibrium

1999 ◽  
Vol 86 (9) ◽  
pp. 4792-4798 ◽  
Author(s):  
Lindsey D. Thornhill ◽  
Prateen V. Desai
Keyword(s):  
Asymptotic Solutions ◽  
Ionization Nonequilibrium

Mg-Doped Sapphire Crystal Fibers Grown by Laser-Heated Pedestal Growth Method

2006 ◽  
Vol 45 (1A) ◽  
pp. 194-199 ◽  
Author(s):  
Che-Ming Liu ◽  
Jyh-Chen Chen ◽  
Chang-Hung Chiang ◽  
Long-Jang Hu ◽  
Sheuan-Perng Lin
Keyword(s):  
Sapphire Crystal ◽  
Growth Method ◽  
Crystal Fibers ◽  
Laser Heated ◽  
Mg Doped
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