Thermophysics and Aeromechanics
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The influence of pulsed CO2-laser radiation on the transport of powder during laser cladding of metal
Thermophysics and Aeromechanics - Tập 25 - Trang 897-908 - 2019
The problem of measurement of the in-flight velocity and temperature of particles in the light field of a pulsedperiodic laser was solved using contactless detection methods. The solution of the problem is based on using a spectrometer and a complex of laser and optical means. The diagnostic technique combines two independent methods for measuring the in-flight particle velocity: a passive one, ba...... hiện toàn bộ
Influence of the choice of the spectral interval on the accuracy of temperature determination by multiwave thermometry methods
Thermophysics and Aeromechanics - Tập 28 - Trang 265-269 - 2021
The instrumental accuracy of determining the model temperatures by the data of radiance temperature measurements at two and three experimental points is analyzed using model examples, when neither thermodynamic temperature nor emissivity of the sighting site is known. The instrumental accuracy of determining the desired temperature is estimated depending on the choice of a spectral window in the t...... hiện toàn bộ
Mathematical simulation of melting inside a square cavity with a local heat source
Thermophysics and Aeromechanics - Tập 23 - Trang 553-565 - 2016
Numerical simulation of transient melting regimes inside an enclosure in the presence of a local heat source has been carried out. Mathematical model formulated in terms of dimensionless variables such as stream function, vorticity, and temperature has been numerically solved by finite difference method. Effects of the Rayleigh number 4·105 ≤ Ra ≤ 5·107, Stefan number 2.21 ≤ Ste ≤ 5.53, and dimens...... hiện toàn bộ
Intertube bridge and rivulet liquid flows
Thermophysics and Aeromechanics - Tập 28 - Trang 669-675 - 2022
A model of a rivulet formed on the coils of a tubular heat exchanger has been developed. The cross-sectional shape of the rivulet is determined taking into account the forces of gravity of liquid, the forces of surface tension, and centrifugal forces. The equations for the coordinates of the free boundary points of the rivulet are presented in the integral form based on the analytical solution of ...... hiện toàn bộ
Simulation parameters of temperature in the process of manufacturing a glass-metal composite
Thermophysics and Aeromechanics - - 2017
Turbulent kinetic energy transfer and dissipation in thermoviscous fluid flow
Thermophysics and Aeromechanics - Tập 27 - Trang 539-554 - 2020
Turbulent flow of thermoviscous liquid is studied in a three-dimensional region with periodicity in two directions. Flow characteristics are described in the terms of equation for turbulent kinetic energy: this allows to differentiate contributions from different components related to generation, transport, and dissipation of turbulent kinetic energy. Those terms can be calculated from averaging t...... hiện toàn bộ
Numerical simulation of wave formation in the falling liquid films
Thermophysics and Aeromechanics - Tập 18 - Trang 425-431 - 2012
The process of wave formation in the falling films of liquid nitrogen was simulated numerically in the framework of the hydrodynamic model of Kapitsa — Shkadov. The typical wave characteristics were calculated for different inlet Reynolds numbers. The effect of parameters of small initial perturbations on wave formation was studied. Satisfactory agreement of numerical simulation results and experi...... hiện toàn bộ
Flow turbulization in a pseudo-shock forming in an axisymmetric duct with a frontal inlet
Thermophysics and Aeromechanics - - 2018
The results of the numerical modeling of the supersonic flow in an axisymmetric duct in which a pseudo-shock arises are presented. The duct includes the frontal inlet with a funnel-shaped part of initial compression of the supersonic flow and with a cylindrical throat part as well as the subsequent (cylindrical or diverging) diffuser where the flow slows down to a subsonic velocity. The flow condi...... hiện toàn bộ
Thermal conductivity of refrigerant R-415A in the vapor phase
Thermophysics and Aeromechanics - Tập 20 Số 4 - Trang 477-479 - 2013
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