Numerical investigation of convection in tubes with aluminium and carbon steel fns: evaluating the assumption of convective heat transfer coefcient as that for the tube without fns and relating physical processes with the optimum spacing between fns

Maurente, André Jesus Soares; Souza, Sandi Itamar Schafer de; Bessa, Kleiber Lima de

Numerical investigation of convection in tubes with aluminium and carbon steel fns: evaluating the assumption of convective heat transfer coefcient as that for the tube without fns and relating physical processes with the optimum spacing between fns

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dc.contributor.author	Maurente, André Jesus Soares
dc.contributor.author	Souza, Sandi Itamar Schafer de
dc.contributor.author	Bessa, Kleiber Lima de
dc.date.accessioned	2021-03-11T20:25:46Z
dc.date.available	2021-03-11T20:25:46Z
dc.date.issued	2019-02-05
dc.description.resumo	Finned tubes exist in diverse geometric confgurations, usually the convective heat transfer coefcient is unknown and approximated as that for a geometry similar to the actual one. This paper presents a numerical investigation about the convective heat transfer in a horizontal fnned tube. Ten geometric confgurations were considered, which difered on the distance between fns, and two materials were analysed for the fns: luminium and carbon steel. Eleven diferent values were considered for the temperature diference between the base of the tube and air. Therefore, a total of one hundred and ten diferent conditions were studied, for each material. The fow regime was laminar. The analysis showed that approximating the convective heat transfer of the fnned tube as that for a tube without fns, for which correlations are available in the literature, can lead to signifcant errors. The maximum diference verifed was for the spacing between fns equal to 2 mm, for which the convective heat transfer coefcient was about seven times lower than that for the tube without fns. For spacings equal to 6 mm and 8 mm, associated to the maximum heat transfer rate, the convective heat transfer coefcient for the tube without fns was about 30% to 50% higher than that for the fnned tube. The common assumption of uniform fns surface temperature was also evaluated for the two considered materials the fns were made of. The results showed that for the steel fns the approximation leads to an error of about 10%, while for aluminium it is only about 3%. Results that allow a better understanding of the physical phenomena related to the occurrence of the optimum spacing between fns, which maximize the heat transfer, are also presented and analysed	pt_BR
dc.identifier.citation	SOUZA, Sandi Itamar Schafer de; BESSA, Kleiber Lima de; MAURENTE, Andre. Numerical investigation of convection in tubes with aluminium and carbon steel fins: evaluating the assumption of convective heat transfer coefficient as that for the tube without fins and relating physical processes with the optimum spacing between fins. Journal of The Brazilian Society of Mechanical Sciences and Engineering, [S.L.], v. 41, n. 3, p. 01-13, 5 fev. 2019. Disponível em: https://link.springer.com/article/10.1007/s40430-019-1609-y. Acesso em: 10 nov. 2020. http://dx.doi.org/10.1007/s40430-019-1609-y.	pt_BR
dc.identifier.doi	10.1007/s40430-019-1609-y
dc.identifier.issn	1678-5878
dc.identifier.issn	1806-3691
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/31809
dc.language	en	pt_BR
dc.publisher	Springer	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	Finned tube	pt_BR
dc.subject	Natural convection	pt_BR
dc.subject	Numerical analysis	pt_BR
dc.subject	Aluminium fns	pt_BR
dc.subject	Carbon steel fns	pt_BR
dc.title	Numerical investigation of convection in tubes with aluminium and carbon steel fns: evaluating the assumption of convective heat transfer coefcient as that for the tube without fns and relating physical processes with the optimum spacing between fns	pt_BR
dc.type	article	pt_BR