Experimental Investigation of Free Convection Heat Transfer from Horizontal Cylinder to Nanofluids

Dorota Sawicka, Janusz T. Cieśliński and Slawomir Smolen
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Dorota Sawicka: Faculty of Nature and Engineering, J.R. Mayer–Institute for Energy Engineering, City University of Applied Sciences Bremen, Neustadtswall 30, 28199 Bremen, Germany
Janusz T. Cieśliński: Faculty of Mechanical and Ship Technology, Institute of Energy, Gdańsk University of Technology, Narutowicza 11/12, 80233 Gdansk, Poland
Slawomir Smolen: Faculty of Nature and Engineering, J.R. Mayer–Institute for Energy Engineering, City University of Applied Sciences Bremen, Neustadtswall 30, 28199 Bremen, Germany

Energies, 2021, vol. 14, issue 10, 1-14

Abstract: The results of free convection heat transfer investigation from a horizontal, uniformly heated tube immersed in a nanofluid are presented. Experiments were performed with five base fluids, i.e., ethylene glycol (EG), distilled water (W) and the mixtures of EG and water with the ratios of 60/40, 50/50, 40/60 by volume, so the Rayleigh (Ra) number range was 3 × 10 4 ? Ra ? 1.3 × 10 6 and the Prandtl (Pr) number varied from 4.4 to 176. Alumina (Al 2 O 3 ) nanoparticles were tested at the mass concentrations of 0.01, 0.1 and 1%. Enhancement as well as deterioration of heat transfer performance compared to the base fluids were detected depending on the composition of the nanofluid. Based on the experimental results obtained, a correlation equation that describes the dependence of the average Nusselt (Nu) number on the Ra number, Pr number and concentration of nanoparticles is proposed.

Keywords: free convection; horizontal cylinder; nanofluids; correlation equation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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