Account for Energy Accommodation in Calculating the Heat Transfer between Coaxial Cylinders

A dependence of the heat transfer between coaxial cylinders on the energy accommodation coefficient is obtained. The known methods of solving a kinetic equation are compared.     

On unsteady-state heat-and-mass transfer in polyatomic gases

The problem of a nonstationary source of heat or particles in a polyatomic gas is solved analytically. The temperature and concentration distributions vs. distance to the source are constructed. It is shown that a nonstationary heat source may generate acoustic vibration. The solution obtained can be helpful in studying acoustic wave propagation, temperature and concentration fields produced by heat or particle sources of various configuration (in particular, by a laser beam in an absorbing media), etc.     

Dependence of slip coefficients on the nature of the interaction between gas molecules and a wall

A method of solution of the boundary-value problems of kinetic gas theory is developed, making it possible to use the boundary conditions in the most general form. The generalized Maxwell boundary condition that takes into account the dependence of the accommodation coefficient on the angle of incidence of gas molecules is considered as an example.Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 5, pp. 149–152, September–October, 1986.     

Calculation of the heat flux in a plane layer of a diatomic gas with allowance for energy accommodation

The heat flux in a plane layer of a diatomic gas is calculated in an approximation linear in temperature difference. General expressions (independent of the form of the kinetic equation and the solution method) for the heat flux as a function of the energy accommodation coefficient are derived. The accuracy of heat flux calculation versus the number of terms in the distribution function is estimated with the method of semispatial moments.     

FIRST EXAMPLES OF MOLECULAR POLYCHALCOGENIDE COMPLEXES OF THULIUM

Journal of Structural Chemistry - Two new polychalcogenide complexes of thulium are obtained by the interaction of $$[\text{Cp}'''_2 \text{Tm}]$$...     

Analytic Solution of the Kinetic Equation in the Problem of Pointlike Sources in a Diatomic Gas

We obtain an analytic solution of the kinetic equation in the problem of pointlike sources of heat or particles in a gas of diatomic molecules. We analyze the distributions of energy and temperature over separately excited translational and rotational degrees of freedom of molecules.     

On calculation of the heat flux from a spherical particle in a molecular gas

The problem of calculation of the heat flux from a spherical particle in a molecular gas is considered. The results of numerical calculations for the collision integral similar to that in the BGK model are presented under the condition of purely diffuse reflection of gas molecules from the surface of a particle.     

On the solution of the kinetic equation for a heat flux between concentric spheres

The problem of calculating a heat flux in a spherical layer is considered. The results are obtained in terms of the Bhatnagar-Gross-Krook model and the Boltzmann collision integral. A general (independent of the form of the kinetic equation and the solution method) expression for the heat flux as a function of the energy accommodation coefficient is derived. The results are compared with the experiment and the analytical results obtained previously.     

Calculation of a Heat Flow from a Spherical Particle in a Diatomic Gas

The problem of heat flow from a uniformly heated spherical particle in a diatomic gas is considered. The paper reports results of numerical calculations for an analog of the Bhatnagar–Gross–Krook model of the collision integral under for purely diffuse reflection of the gas molecules from the surface.     

Calculation of the heat transfer between coaxial cylinders for arbitrary knudsen numbers

The problem of calculating the heat flux between coaxial cylinders is considered. A procedure that is analogous to the method of half-spatial moments is applied to solving the kinetic equation. The calculation results for the Bhatnagar-Gross-Krook model (BGK) of the collision integral for the case of purely diffuse reflection are presented.