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- Title
Analysis of components effecting free convection intensity in steel rectangular sections.
- Authors
Wyczółkowski, Rafał
- Abstract
Free convection is one of the heat transfer modes which occurs within the heat-treated bundles of steel rectangular section. A comprehensive study of this phenomenon is necessary for optimizing the heating process of this type of charge. The free convection intensity is represented by the Rayleigh number Ra. The value of this criterion depends on the following parameters: the mean section temperature, temperature difference within the section, kinematic coefficient of viscosity, volume expansion coefficient and the Prandtl number. The paper presents the analysis of the impact of these factors on free convection in steel rectangular sections. The starting point for this analysis were the results of experimental examinations. It was found that the highest intensity of this process occurs for the temperature of 100 °C. This is mainly caused by changes in the temperature difference observed in the area of sections and changes in kinematic coefficient of viscosity of air. The increase in the value of the Rayleigh number criterion at the initial stage is attributable to changes in the parameter of temperature difference within the section. After exceeding 100 °C, the main effect on convection is from changes in air viscosity. Thus, with further increase in temperature, the Rayleigh number starts to decline rapidly despite further rise in the difference in temperature.
- Subjects
FREE convection; HEAT transfer; MATHEMATICAL models of thermodynamics; PRANDTL number; CONVECTIVE flow; VISCOSITY; MATHEMATICAL models
- Publication
Archives of Thermodynamics, 2015, Vol 36, Issue 3, p105
- ISSN
1231-0956
- Publication type
Article
- DOI
10.1515/aoter-2015-0024