naa a22 4500 510758886 CHVBK 20180411083132.0 cr unu---uuuuu 180411e20130801xx s 000 0 eng 10.1134/S0869864313040045 doi (NATIONALLICENCE)springer-10.1134/S0869864313040045 Surface radiation influence on the regimes of conjugate natural convection in an enclosure with local energy source [Elektronische Daten] [S. Martyushev, M. Sheremet] A numerical analysis of the unsteady regimes of the natural convection and thermal radiation in a square enclosure with heat-conducting walls has been carried out in the presence of a heat source of finite sizes located in the base zone under the conditions of convective exchange with the ambient medium. The mathematical model formulated in the dimensionless variables "stream function — vorticity — temperature” has been implemented numerically by a finite difference method. The influence of the reduced emissivity of internal surfaces of bounding walls on the local characteristics (the streamlines and temperature fields) and on the integral complex (the mean Nusselt number on typical boundaries) has been analyzed in detail for 0 ≤ ɛ < 1, the location of the heat source 0.1 ≤ l/L ≤ 0.4, and its length 0.2 ≤ l hs /L ≤ 0.6 for Ra = 106, Pr = 0.7. The approximation relations have been derived for the mean convective and radiation Nusselt numbers depending on the reduced emissivity of the internal surfaces of bounding walls and the energy source location relative to vertical walls. Pleiades Publishing, Ltd., 2013 conjugate heat transfer nationallicence natural convection nationallicence Boussinesq approximation nationallicence thermal radiation nationallicence diathermal medium nationallicence unsteady regime nationallicence numerical modelling nationallicence Martyushev S. Tomsk State University, Tomsk, Russia aut Sheremet M. Tomsk State University, Tomsk, Russia aut Thermophysics and Aeromechanics Kutateladze Institute of Thermophysics SB RAS 20/4(2013-08-01), 417-428 0869-8643 20:4<417 2013 20 11510 https://doi.org/10.1134/S0869864313040045 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S0869864313040045 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Martyushev S. Tomsk State University, Tomsk, Russia aut NATIONALLICENCE 700 1- Sheremet M. Tomsk State University, Tomsk, Russia aut NATIONALLICENCE 773 0- Thermophysics and Aeromechanics Kutateladze Institute of Thermophysics SB RAS 20/4(2013-08-01), 417-428 0869-8643 20:4<417 2013 20 11510 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer