Numerical modeling of a 2D wave of electron thermal conductivity produced by a laser beam in targets of subcritical density

2000 ◽  
Vol 21 (2) ◽  
pp. 157-167
Author(s):  
S. Yu. Gus'kov ◽  
I. V. Popov ◽  
V. B. Rozanov ◽  
V. F. Tishkin ◽  
N. V. Zmitrenko
Keyword(s):  
Thermal Conductivity ◽  
Numerical Modeling ◽  
Laser Beam ◽  
Electron Thermal Conductivity

TRIGGERING OF DETONATION PROCESSES IN PROPULSION CHAMBER

2021 ◽  
Vol 14 (2) ◽  
pp. 40-45
Author(s):  
D. V. VORONIN ◽  
Keyword(s):  
Thermal Conductivity ◽  
Numerical Modeling ◽  
Gas Flow ◽  
Stokes Equations ◽  
Navier Stokes ◽  
Two Dimensional ◽  
Navier Stokes Equations ◽  
Chemically Reacting ◽  
Plane Disk ◽  
And Diffusion

The Navier-Stokes equations have been used for numerical modeling of chemically reacting gas flow in the propulsion chamber. The chamber represents an axially symmetrical plane disk. Fuel and oxidant were fed into the chamber separately at some angle to the inflow surface and not parallel one to another to ensure better mixing of species. The model is based on conservation laws of mass, momentum, and energy for nonsteady two-dimensional compressible gas flow in the case of axial symmetry. The processes of viscosity, thermal conductivity, turbulence, and diffusion of species have been taken into account. The possibility of detonation mode of combustion of the mixture in the chamber was numerically demonstrated. The detonation triggering depends on the values of angles between fuel and oxidizer jets. This type of the propulsion chamber is effective because of the absence of stagnation zones and good mixing of species before burning.

scholarly journals Numerical modeling of microwave heating

2010 ◽  
Vol 42 (1) ◽  
pp. 99-124 ◽  
Author(s):  
A.K. Shukla ◽  
A. Mondal ◽  
A. Upadhyaya
Keyword(s):  
Thermal Conductivity ◽  
Numerical Modeling ◽  
Temperature Distribution ◽  
Microwave Heating ◽  
Two Dimensional ◽  
Conventional Furnace ◽  
Microwave Furnace ◽  
Simulation Results ◽  
Heating Behavior ◽  
Cylindrical Samples

The present study compares the temperature distribution within cylindrical samples heated in microwave furnace with those achieved in radiatively-heated (conventional) furnace. Using a two-dimensional finite difference approach the thermal profiles were simulated for cylinders of varying radii (0.65, 6.5, and 65 cm) and physical properties. The influence of susceptor-assisted microwave heating was also modeled for the same. The simulation results reveal differences in the heating behavior of samples in microwaves. The efficacy of microwave heating depends on the sample size and its thermal conductivity.

Laser x-ray Conversion and Electron Thermal Conductivity

2001 ◽  
Vol 3 (1) ◽  
pp. 653-658 ◽  
Author(s):  
Wang Guang-yu ◽  
Chang Tie-qiang
Keyword(s):  
Thermal Conductivity ◽  
Electron Thermal Conductivity ◽  
X Ray

scholarly journals Simulation of a Contact Pseudo-Environment in Calculating Thermal Resistance

2021 ◽  
Vol 346 ◽  
pp. 03049
Author(s):  
Alexander Denisenko ◽  
Roman Grishin ◽  
Liubov Podkruglyak
Keyword(s):  
Thermal Conductivity ◽  
Finite Element Method ◽  
Numerical Modeling ◽  
Thermal Resistance ◽  
Contact Zone ◽  
Metal Cutting ◽  
The Finite Element Method ◽  
Contact Thermal Resistance ◽  
Temperature Criterion ◽  
The Ideal

The use of the temperature criterion in the design of metal-cutting machines, determined on the basis of models that take into account the contact thermal resistances, is an objective necessity. These models should take into account to the maximum extent the actual conditions of contact of parts in the design under consideration, determined by the deviations of the mating surfaces from the ideal shape. The article presents the results of numerical modeling based on the finite element method of the formation of the contact thermal resistance and the evaluation of the influence of the parameters of the intermediate layer (pseudo-environment) that occurs in the contact zone of surfaces with macro-deviations on the passage of the heat flow. The obtained results allowed us to identify the most significant of the considered parameters. It is established that when modeling a pseudo-environment, it is necessary to take into account the coefficient of its thermal conductivity, the size, location and integrity of the actual contact zone.

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