Thermo-Hydraulic Characteristics of Micro-Scale Surface Roughness Topology of Additively Manufactured Surface Model: Modal Decomposition Perspective

As a consequence of rapid development of additive manufacturing (3D printing) methods, the academic/industrial demand has been continuously increasing. One field of application is the manufacturing of heat exchanging devices using this promising method. In this regard, understanding the underlying m...

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Autores principales:	Sina Lohrasbi, René Hammer, Werner Eßl, Georg Reiss, Stefan Defregger, Wolfgang Sanz
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	heat transfer large eddy simulation POD surface roughness turbulence Technology T
Acceso en línea:	https://doaj.org/article/60d885170313443fad04c467a28ecf9d
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id	oai:doaj.org-article:60d885170313443fad04c467a28ecf9d
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spelling	oai:doaj.org-article:60d885170313443fad04c467a28ecf9d2021-11-25T17:27:33ZThermo-Hydraulic Characteristics of Micro-Scale Surface Roughness Topology of Additively Manufactured Surface Model: Modal Decomposition Perspective10.3390/en142276501996-1073https://doaj.org/article/60d885170313443fad04c467a28ecf9d2021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/22/7650https://doaj.org/toc/1996-1073As a consequence of rapid development of additive manufacturing (3D printing) methods, the academic/industrial demand has been continuously increasing. One field of application is the manufacturing of heat exchanging devices using this promising method. In this regard, understanding the underlying mechanisms from a thermo-hydraulic viewpoint becomes important. Therefore, in this study, scale-resolving large eddy simulation (LES) is applied to reveal the flow details in combination with a model of roughness topology occurring in additive manufacturing. To process the transient LES results, proper orthogonal decomposition (POD) is used to extract the coherent flow structures, and the extended POD is used to rank the flow modes based on thermal importance. The main aim of the present work is to go beyond the conventionally applied methodologies used for the evaluation of surface roughness, i.e., averaged numerical study or experimental overall performance evaluation of the flow/thermal response of additively manufactured surfaces in heat exchangers. This is necessary to reveal the underlying flow mechanisms hidden in the conventional studies. In this study, the behavior of the flow over the micro-scale surface roughness model and its effects on heat transfer are studied by assuming cone-shaped roughness elements with regular placement as the dominant surface roughness structures. The major discussions reveal the footprint of flow mechanisms on the heat transfer coefficient spatial modes on the rough surface. Moreover, comparative study on the flow/thermal behavior at different levels of roughness heights shows the key role of the height-to-base-diameter ratio of the roughness elements in thermal performance.Sina LohrasbiRené HammerWerner EßlGeorg ReissStefan DefreggerWolfgang SanzMDPI AGarticleheat transferlarge eddy simulationPODsurface roughnessturbulenceTechnologyTENEnergies, Vol 14, Iss 7650, p 7650 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	heat transfer large eddy simulation POD surface roughness turbulence Technology T
spellingShingle	heat transfer large eddy simulation POD surface roughness turbulence Technology T Sina Lohrasbi René Hammer Werner Eßl Georg Reiss Stefan Defregger Wolfgang Sanz Thermo-Hydraulic Characteristics of Micro-Scale Surface Roughness Topology of Additively Manufactured Surface Model: Modal Decomposition Perspective
description	As a consequence of rapid development of additive manufacturing (3D printing) methods, the academic/industrial demand has been continuously increasing. One field of application is the manufacturing of heat exchanging devices using this promising method. In this regard, understanding the underlying mechanisms from a thermo-hydraulic viewpoint becomes important. Therefore, in this study, scale-resolving large eddy simulation (LES) is applied to reveal the flow details in combination with a model of roughness topology occurring in additive manufacturing. To process the transient LES results, proper orthogonal decomposition (POD) is used to extract the coherent flow structures, and the extended POD is used to rank the flow modes based on thermal importance. The main aim of the present work is to go beyond the conventionally applied methodologies used for the evaluation of surface roughness, i.e., averaged numerical study or experimental overall performance evaluation of the flow/thermal response of additively manufactured surfaces in heat exchangers. This is necessary to reveal the underlying flow mechanisms hidden in the conventional studies. In this study, the behavior of the flow over the micro-scale surface roughness model and its effects on heat transfer are studied by assuming cone-shaped roughness elements with regular placement as the dominant surface roughness structures. The major discussions reveal the footprint of flow mechanisms on the heat transfer coefficient spatial modes on the rough surface. Moreover, comparative study on the flow/thermal behavior at different levels of roughness heights shows the key role of the height-to-base-diameter ratio of the roughness elements in thermal performance.
format	article
author	Sina Lohrasbi René Hammer Werner Eßl Georg Reiss Stefan Defregger Wolfgang Sanz
author_facet	Sina Lohrasbi René Hammer Werner Eßl Georg Reiss Stefan Defregger Wolfgang Sanz
author_sort	Sina Lohrasbi
title	Thermo-Hydraulic Characteristics of Micro-Scale Surface Roughness Topology of Additively Manufactured Surface Model: Modal Decomposition Perspective
title_short	Thermo-Hydraulic Characteristics of Micro-Scale Surface Roughness Topology of Additively Manufactured Surface Model: Modal Decomposition Perspective
title_full	Thermo-Hydraulic Characteristics of Micro-Scale Surface Roughness Topology of Additively Manufactured Surface Model: Modal Decomposition Perspective
title_fullStr	Thermo-Hydraulic Characteristics of Micro-Scale Surface Roughness Topology of Additively Manufactured Surface Model: Modal Decomposition Perspective
title_full_unstemmed	Thermo-Hydraulic Characteristics of Micro-Scale Surface Roughness Topology of Additively Manufactured Surface Model: Modal Decomposition Perspective
title_sort	thermo-hydraulic characteristics of micro-scale surface roughness topology of additively manufactured surface model: modal decomposition perspective
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/60d885170313443fad04c467a28ecf9d
work_keys_str_mv	AT sinalohrasbi thermohydrauliccharacteristicsofmicroscalesurfaceroughnesstopologyofadditivelymanufacturedsurfacemodelmodaldecompositionperspective AT renehammer thermohydrauliccharacteristicsofmicroscalesurfaceroughnesstopologyofadditivelymanufacturedsurfacemodelmodaldecompositionperspective AT wernereßl thermohydrauliccharacteristicsofmicroscalesurfaceroughnesstopologyofadditivelymanufacturedsurfacemodelmodaldecompositionperspective AT georgreiss thermohydrauliccharacteristicsofmicroscalesurfaceroughnesstopologyofadditivelymanufacturedsurfacemodelmodaldecompositionperspective AT stefandefregger thermohydrauliccharacteristicsofmicroscalesurfaceroughnesstopologyofadditivelymanufacturedsurfacemodelmodaldecompositionperspective AT wolfgangsanz thermohydrauliccharacteristicsofmicroscalesurfaceroughnesstopologyofadditivelymanufacturedsurfacemodelmodaldecompositionperspective
_version_	1718412353127579648

Thermo-Hydraulic Characteristics of Micro-Scale Surface Roughness Topology of Additively Manufactured Surface Model: Modal Decomposition Perspective

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