N2 - The paper describes tests intended to examine the occurrence of natural convection within the space occupied by 40×20 mm rectangular steel sections. Within these tests the bed of four layers of section was heated by the electric palate heater. Depending on the manner in which the heater was positioned, the tests were divided into two series. In the case of heating from above, the heat flowing through the bed is transferred only by conduction and radiation. When heating the bed from below, in addition to conduction and radiation, also a convective heat transfer will occur. Should this be the case, it will result in the intensification of the heat exchange. The results of measurements carried out have not demonstrated that the occurrence of any possible natural convection would influence the development of a temperature field in this type of charge. L1 - http://journals.pan.pl/Content/94353/PDF/07_paper.pdf L2 - http://journals.pan.pl/Content/94353 PY - 2012 IS - No 3 October EP - 95 DO - 10.2478/v10173-012-0020-1 KW - Free convection KW - Rayleigh number KW - Rectangular sections A1 - Wyczółkowski, Rafał A1 - Musiał, Dorota PB - The Committee of Thermodynamics and Combustion of the Polish Academy of Sciences and The Institute of Fluid-Flow Machinery Polish Academy of Sciences DA - 2012 T1 - Experimental tests for the occurence of convective heat transfer within the bed of rectangular steel profiles SP - 84 UR - http://journals.pan.pl/dlibra/publication/edition/94353 T2 - Archives of Thermodynamics