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INTEGRAL TRANSFORMATION IN A PARTIALLY BOUNDED REGION WITH A RADIAL THERMAL FLOW

https://doi.org/10.32362/2410-6593-2018-13-6-89-96

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Abstract

A mathematical theory is developed for constructing integral transformations in a partially bounded region with a radial heat flow - a massive body bounded from the inside by a cylindrical cavity. Constructed: an integral transformation, the image of the operator on the right side of the equation of unsteady heat conduction, the inversion formula for the image of the desired function. The proposed approach favorably differs from the classical theory of differential equations of mathematical physics for the construction of generalized integral transformations based on the eigenfunctions of the corresponding singular Sturm-Liouville problems. The developed method is based on the operational solution of the initial boundary problems of unsteady heat conduction with an initial function of a general form L2(r0,∞) belonging to the r > r0 region and homogeneous boundary conditions and is associated with the calculation of the Riemann-Mellin contour integrals from images containing various combinations of modified Bessel functions. At the same time, for the above-mentioned region, the method of Green's functions was developed by constructing integral representations of analytical solutions of the first, second and third boundary value problems through inhomogeneities in the initial formulation of the problem (boundary conditions, source function in the initial equation). Mathematical models for finding the corresponding Green's functions are formulated, and functional relations of all three Green functions included in the presented integral formula are written out with the help of the developed theory of integral transformations. The functional relations constructed in the article can be used when considering numerous special cases of practical thermal physics. The specific possible applications of the presented results in many areas of science and technology are given.

About the Author

E. M. Kartashov
MIREA - Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)
Russian Federation

D.Sc. (Physics and Mathematics), Professor of the Chair of Higher and Applied Mathematics

86, Vernadskogo Pr., Moscow 119571, Russia



References

1. Kartashov E.M. Analytical methods in the theory of thermal conductivity of solids. Moscow: Vysshaya shkola Publ., 2001. 550 p. (in Russ.)

2. Koshlyakov N.S., Gliner E.B., Smirnov M.M. Equations in partial derivatives of mathematical physics. Moscow: Vysshaya shkola Publ., 1970. 710 p. (in Russ.)

3. Volkov I.K., Kanatnikov A.N. Integral transforms and operational calculus. Moscow: Publishing House of the N.E. Bauman Moscow State Technical University, 1996. 228 p. (in Russ.)

4. Kartashov E.M. The method of integral transformations in the analytic theory of the thermal conductivity of solids. Izvestiya Rossiiskoi Akademii Nauk. Energetika (Proceedings of RAS. Power Engineering). 1993; 2: 99-127. (in Russ.)

5. Kartashov E.M. Calculation of temperature fields in solids based on improved convergence of FourierHankel series. Izvestiya Rossiiskoi Akademii Nauk. Energetika (Proceedings of RAS. Power Engineering). 1993; 3: 106-125. (in Russ.).

6. Kartashov E.M., Mikhailova N.A. Integral relations for analytic solutions of the generalized equation of nonstationary heat conduction. Vestnik MITHT (Fine Chemical Technologies). 2011; 6(3): 106-110. (in Russ.)

7. Kartashov E.M., Kudinov V.A. Analytical theory of heat conductivity and applied thermoelasticity. Moscow: URSS Publ., 2012. 653 p. (in Russ.).

8. Carslow G., Eger E. Thermal conductivity of solids. Moscow: Nauka Publ., 1964. 487 p. (in Russ.)

9. Attetkov A.V., Volkov I.K. Formation of temperature fields in a region bounded from within by a cylindrical cavity. Vestnik MGTU. Mashinostroenie (Herald of the Bauman Moscow State Technical University. Mechanical Engineering). 1999; 1: 49-56. (in Russ.)

10. Kartashov E.M. On a class of integral transformations for the generalized equation of nonstationary heat conductivity. Inghenerno-phisicheskii zhurnal (Journal of Engineering Physics and Thermophysics). 2008; 81(1): 123-130. (in Russ.)


For citation:


Kartashov E.M. INTEGRAL TRANSFORMATION IN A PARTIALLY BOUNDED REGION WITH A RADIAL THERMAL FLOW. Fine Chemical Technologies. 2018;13(6):89-96. (In Russ.) https://doi.org/10.32362/2410-6593-2018-13-6-89-96

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ISSN 2410-6593 (Print)
ISSN 2686-7575 (Online)