Parameter Variability in Viscous Convection

For the optimal design of cooling and heating devices, the properties of the included fluids are crucial. The temperature dependence of viscosity deserves attention, as changes can be one order of magnitude or more. Here we examine the influence on convective motions by simulating a heating and cool...

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Autor principal:	Ekkehard Holzbecher
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	thermal convection density-driven flow parameter dependency CFD Thermodynamics QC310.15-319 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/7ca14d931f8d462283462d9efa0d967f
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id	oai:doaj.org-article:7ca14d931f8d462283462d9efa0d967f
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spelling	oai:doaj.org-article:7ca14d931f8d462283462d9efa0d967f2021-11-25T17:31:24ZParameter Variability in Viscous Convection10.3390/fluids61103762311-5521https://doaj.org/article/7ca14d931f8d462283462d9efa0d967f2021-10-01T00:00:00Zhttps://www.mdpi.com/2311-5521/6/11/376https://doaj.org/toc/2311-5521For the optimal design of cooling and heating devices, the properties of the included fluids are crucial. The temperature dependence of viscosity deserves attention, as changes can be one order of magnitude or more. Here we examine the influence on convective motions by simulating a heating and cooling experiment with a vertical cylinder by finite element computational fluid dynamics (CFD) models. Such an experimental setup in which flow patterns are determined by transient viscous convection has not been simulated before. Evaluating the general behavior of the experiment in 2D, we find a dynamic phase after and before phases with moderate changes. Flow patterns in the dynamic phase change significantly with the temperature range of the experiment. We compare the outcome of the numerical models with results from laboratory experiments, finding major discrepancies concerning the flow patterns in the dynamic phase. 3D modeling shows weaker dynamics but does not show good timing with the experiment. The study depicts the importance of parameter dependencies for convective motions and demonstrates the capabilities and limitations of models to reproduce details of viscous convection.Ekkehard HolzbecherMDPI AGarticlethermal convectiondensity-driven flowparameter dependencyCFDThermodynamicsQC310.15-319Descriptive and experimental mechanicsQC120-168.85ENFluids, Vol 6, Iss 376, p 376 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	thermal convection density-driven flow parameter dependency CFD Thermodynamics QC310.15-319 Descriptive and experimental mechanics QC120-168.85
spellingShingle	thermal convection density-driven flow parameter dependency CFD Thermodynamics QC310.15-319 Descriptive and experimental mechanics QC120-168.85 Ekkehard Holzbecher Parameter Variability in Viscous Convection
description	For the optimal design of cooling and heating devices, the properties of the included fluids are crucial. The temperature dependence of viscosity deserves attention, as changes can be one order of magnitude or more. Here we examine the influence on convective motions by simulating a heating and cooling experiment with a vertical cylinder by finite element computational fluid dynamics (CFD) models. Such an experimental setup in which flow patterns are determined by transient viscous convection has not been simulated before. Evaluating the general behavior of the experiment in 2D, we find a dynamic phase after and before phases with moderate changes. Flow patterns in the dynamic phase change significantly with the temperature range of the experiment. We compare the outcome of the numerical models with results from laboratory experiments, finding major discrepancies concerning the flow patterns in the dynamic phase. 3D modeling shows weaker dynamics but does not show good timing with the experiment. The study depicts the importance of parameter dependencies for convective motions and demonstrates the capabilities and limitations of models to reproduce details of viscous convection.
format	article
author	Ekkehard Holzbecher
author_facet	Ekkehard Holzbecher
author_sort	Ekkehard Holzbecher
title	Parameter Variability in Viscous Convection
title_short	Parameter Variability in Viscous Convection
title_full	Parameter Variability in Viscous Convection
title_fullStr	Parameter Variability in Viscous Convection
title_full_unstemmed	Parameter Variability in Viscous Convection
title_sort	parameter variability in viscous convection
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/7ca14d931f8d462283462d9efa0d967f
work_keys_str_mv	AT ekkehardholzbecher parametervariabilityinviscousconvection
_version_	1718412232576991232

Parameter Variability in Viscous Convection

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