Publications Repository - Gdańsk University of Technology

This paper deals with natural convection around a circular cylinder with constant heat flux in a cavity using computational fluid dynamics. As fluids ethylene glycol and a mixture of ethylene glycol with Al2O3 nanoparticles (mass concentrations of nanoparticles: 0.1% and 1%) are chosen. Rayleigh number ranges from 3104 to 3105. The nanofluids are modeled with single-phase approach. For the investigated range of nanoparticle concentration, the influence of concentration on Nusselt, Rayleigh number and heat transfer coefficient is small. Nevertheless, a slight shift toward lower Nusselt, Rayleigh numbers and an increase in heat transfer coefficient occur. The Nusselt number depends on Rayleigh number and only negligible on Prandtl number, which is in accordance with literature for Prandtl numbers of around 200. The numerically obtained results are compared with own preliminary experimental data, deviations are discussed.

Authors

• Dorota Sawicka link open in new tab ,
• Prof. Albert Baars,
• prof. dr hab. inż. Janusz Cieśliński link open in new tab ,
• Sławomir Smoleń