Conjugate buoyant convective transport of nanofluids in an enclosed annular geometry

Abstract A vertical annular configuration with differently heated cylindrical surfaces and horizontal adiabatic boundaries is systematically studied in view to their industrial applications. In this paper, we investigate the effects of conjugate buoyant heat transport in water based nanofluids with...

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Autores principales:	M. Sankar, N. Keerthi Reddy, Younghae Do
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/060ac3b0e0304a44992bb065ea6718b9
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spelling	oai:doaj.org-article:060ac3b0e0304a44992bb065ea6718b92021-12-02T18:53:18ZConjugate buoyant convective transport of nanofluids in an enclosed annular geometry10.1038/s41598-021-96456-82045-2322https://doaj.org/article/060ac3b0e0304a44992bb065ea6718b92021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-96456-8https://doaj.org/toc/2045-2322Abstract A vertical annular configuration with differently heated cylindrical surfaces and horizontal adiabatic boundaries is systematically studied in view to their industrial applications. In this paper, we investigate the effects of conjugate buoyant heat transport in water based nanofluids with different nanoparticles such as alumina, titania or copper, and is filled in the enclosed annular gap. The annulus space is formed by a thick inner cylinder having a uniform high temperature, an exterior cylindrical tube with a constant lower temperature, and thermally insulated upper and lower surfaces. By investigating heat transport for broad spectrum of Rayleigh number, solid wall thickness, thermal conductivity ratio and nanoparticle volume fraction, we found that the influence of wall thickness on thermal dissipation rate along wall and interface greatly depends on conductivity ratio and vice-versa. In particular, we uncover that the choice of nanoparticle in a nanofluid and its concentration are key factors in enhancing the thermal transport along the interface. Specially, copper based nanofluids produces higher heat transport among other nanoparticles, and for the range of nanoparticle concentration chosen in this analysis, enhanced thermal dissipation along the interface has been detected as nanoparticle volume fraction is increased. Our results are applicable to choose nanofluids along with other critical parameters for the desired heat transport.M. SankarN. Keerthi ReddyYounghae DoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-22 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q M. Sankar N. Keerthi Reddy Younghae Do Conjugate buoyant convective transport of nanofluids in an enclosed annular geometry
description	Abstract A vertical annular configuration with differently heated cylindrical surfaces and horizontal adiabatic boundaries is systematically studied in view to their industrial applications. In this paper, we investigate the effects of conjugate buoyant heat transport in water based nanofluids with different nanoparticles such as alumina, titania or copper, and is filled in the enclosed annular gap. The annulus space is formed by a thick inner cylinder having a uniform high temperature, an exterior cylindrical tube with a constant lower temperature, and thermally insulated upper and lower surfaces. By investigating heat transport for broad spectrum of Rayleigh number, solid wall thickness, thermal conductivity ratio and nanoparticle volume fraction, we found that the influence of wall thickness on thermal dissipation rate along wall and interface greatly depends on conductivity ratio and vice-versa. In particular, we uncover that the choice of nanoparticle in a nanofluid and its concentration are key factors in enhancing the thermal transport along the interface. Specially, copper based nanofluids produces higher heat transport among other nanoparticles, and for the range of nanoparticle concentration chosen in this analysis, enhanced thermal dissipation along the interface has been detected as nanoparticle volume fraction is increased. Our results are applicable to choose nanofluids along with other critical parameters for the desired heat transport.
format	article
author	M. Sankar N. Keerthi Reddy Younghae Do
author_facet	M. Sankar N. Keerthi Reddy Younghae Do
author_sort	M. Sankar
title	Conjugate buoyant convective transport of nanofluids in an enclosed annular geometry
title_short	Conjugate buoyant convective transport of nanofluids in an enclosed annular geometry
title_full	Conjugate buoyant convective transport of nanofluids in an enclosed annular geometry
title_fullStr	Conjugate buoyant convective transport of nanofluids in an enclosed annular geometry
title_full_unstemmed	Conjugate buoyant convective transport of nanofluids in an enclosed annular geometry
title_sort	conjugate buoyant convective transport of nanofluids in an enclosed annular geometry
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/060ac3b0e0304a44992bb065ea6718b9
work_keys_str_mv	AT msankar conjugatebuoyantconvectivetransportofnanofluidsinanenclosedannulargeometry AT nkeerthireddy conjugatebuoyantconvectivetransportofnanofluidsinanenclosedannulargeometry AT younghaedo conjugatebuoyantconvectivetransportofnanofluidsinanenclosedannulargeometry
_version_	1718377307820785664

Conjugate buoyant convective transport of nanofluids in an enclosed annular geometry

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