Free Convection Heat Transfer from Horizontal Cylinders

Janusz T. Cieśliński, Slawomir Smolen and Dorota Sawicka
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Janusz T. Cieśliński: Faculty of Mechanical and Ocean Engineering, Gdańsk University of Technology, Narutowicza 11/12, 80233 Gdansk, Poland
Slawomir Smolen: Faculty of Nature and Engineering, City University of Applied Sciences Bremen, Neustadtswall 30, 28199 Bremen, Germany
Dorota Sawicka: Faculty of Nature and Engineering, City University of Applied Sciences Bremen, Neustadtswall 30, 28199 Bremen, Germany

Energies, 2021, vol. 14, issue 3, 1-22

Abstract: The results of experimental investigation of free convection heat transfer in a rectangular container are presented. The ability of the commonly accepted correlation equations to reproduce present experimental data was tested as well. It was assumed that the examined geometry fulfils the requirement of no-interaction between heated cylinder and bounded surfaces. In order to check this assumption recently published correlation equations that jointly describe the dependence of the average Nusselt number on Rayleigh number and confinement ratios were examined. As a heat source served electrically heated horizontal tube immersed in an ambient fluid. Experiments were performed with pure ethylene glycol (EG), distilled water (W), and a mixture of EG and water at 50%/50% by volume. A set of empirical correlation equations for the prediction of Nu numbers for Rayleigh number range 3.6 × 10 4 < Ra < 9.2 × 10 5 or 3.6 × 10 5 < Ra q < 14.8 × 10 6 and Pr number range 4.5 ≤ Pr ≤ 160 has been developed. The proposed correlation equations are based on two characteristic lengths, i.e., cylinder diameter and boundary layer length.

Keywords: free convection; horizontal cylinder; experiment; correlation equations (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 complete reference list from CitEc
Citations: View citations in EconPapers (4)

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