Communications - Scientific Letters of the University of Zilina 2015, 17(3):4-11 | DOI: 10.26552/com.C.2015.3.4-11

Correlations for Heat Transport by Natural Convection of Cylindrical Surfaces Situated One above the Other

Milan Malcho1, Jozef Jandacka1, Tadeas Ochodek2, Jan Kolonicny2
1 Department of Power Engineering, Faculty of Mechanical Engineering, University of Zilina, Slovakia
2 Energy Research Center, VSB - Technical University of Ostrava, Ostrava - Poruba, Czech Republic

The paper presents a new criterion equation for calculating the Nusselt number for heat transport by natural convection from different numbers of cylindrical surfaces of heating sources. Horizontal cylindrical surfaces are situated one above the other and each of them is independently electrically heated by constant power output of Joule heating. Correlation relationships were derived on the basis of tens of measurements of heat outputs of the system of electrically heated horizontal cylindrical surfaces in a thermostatic chamber under defined conditions. The number of cylindrical surfaces, their distance and heat output to the horizontal cylinder varied during measurements. The derived criterion equation is significantly simpler compared to equations corrected by polynomial regression.

Keywords: natural convection; cylindrical surfaces one above the other; criterial equations

Published: August 31, 2015  Show citation

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Malcho, M., Jandacka, J., Ochodek, T., & Kolonicny, J. (2015). Correlations for Heat Transport by Natural Convection of Cylindrical Surfaces Situated One above the Other. Communications - Scientific Letters of the University of Zilina, 17(3), 4-11. doi: 10.26552/com.C.2015.3.4-11
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