Data reduction of friction factor, permeability and inertial coefficient for a compressible gas flow through a milli-regenerator

A regenerator of a Stirling machine alternately absorbs and releases heat from and to the working fluid which allows to recycle rejected heat during theoretical isochoric processes. This work focuses on a milli-regenerator fabricated with a multiple jet molding process. The regenerator is a porous m...

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Autores principales:	Dellali Emna, Lanzetta François, Begot Sylvie, Gavignet Eric, Rauch Jean-Yves
Formato:	article
Lenguaje:	EN FR
Publicado:	EDP Sciences 2021
Materias:	Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/38629b17a5d74b2ab9ec59d62fe08f98
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spelling	oai:doaj.org-article:38629b17a5d74b2ab9ec59d62fe08f982021-11-08T15:18:57ZData reduction of friction factor, permeability and inertial coefficient for a compressible gas flow through a milli-regenerator2267-124210.1051/e3sconf/202131305002https://doaj.org/article/38629b17a5d74b2ab9ec59d62fe08f982021-01-01T00:00:00Zhttps://www.e3s-conferences.org/articles/e3sconf/pdf/2021/89/e3sconf_isec2021_05002.pdfhttps://doaj.org/toc/2267-1242A regenerator of a Stirling machine alternately absorbs and releases heat from and to the working fluid which allows to recycle rejected heat during theoretical isochoric processes. This work focuses on a milli-regenerator fabricated with a multiple jet molding process. The regenerator is a porous medium filled with a dense pillar matrix. The pillars have a geometrical lens shape. Two metallic layers (chromium and copper) are deposited on the polymer pillars to increase heat transfer inside the regenerator. We performed experiments on different milli-regenerators corresponding to three porosities (ε = 0.80, 0.85 and 0.90) under nitrogen steady and oscillating compressible flows (oscillating Reynolds number in the range 0 < Reω < 60 and Reynolds number based on the hydraulic diameter ReDh,max<6000) for different temperature gradients (ΔT < 100°C). Temperature, velocity and pressure experimental measurements are performed with microthermocouples (type K with 7,6 µm diameter), hotwires and miniature pressure sensors, respectively. We identified a threeterm composite correlation equation for the friction factor based on a Darcy-Forchheimer flow model that best-fit the experimental data. In steady and oscillating flows permeabilities and inertial coefficients are of the same magnitude order. Inertial coefficients decrease when the porosities increase.Dellali EmnaLanzetta FrançoisBegot SylvieGavignet EricRauch Jean-YvesEDP SciencesarticleEnvironmental sciencesGE1-350ENFRE3S Web of Conferences, Vol 313, p 05002 (2021)
institution	DOAJ
collection	DOAJ
language	EN FR
topic	Environmental sciences GE1-350
spellingShingle	Environmental sciences GE1-350 Dellali Emna Lanzetta François Begot Sylvie Gavignet Eric Rauch Jean-Yves Data reduction of friction factor, permeability and inertial coefficient for a compressible gas flow through a milli-regenerator
description	A regenerator of a Stirling machine alternately absorbs and releases heat from and to the working fluid which allows to recycle rejected heat during theoretical isochoric processes. This work focuses on a milli-regenerator fabricated with a multiple jet molding process. The regenerator is a porous medium filled with a dense pillar matrix. The pillars have a geometrical lens shape. Two metallic layers (chromium and copper) are deposited on the polymer pillars to increase heat transfer inside the regenerator. We performed experiments on different milli-regenerators corresponding to three porosities (ε = 0.80, 0.85 and 0.90) under nitrogen steady and oscillating compressible flows (oscillating Reynolds number in the range 0 < Reω < 60 and Reynolds number based on the hydraulic diameter ReDh,max<6000) for different temperature gradients (ΔT < 100°C). Temperature, velocity and pressure experimental measurements are performed with microthermocouples (type K with 7,6 µm diameter), hotwires and miniature pressure sensors, respectively. We identified a threeterm composite correlation equation for the friction factor based on a Darcy-Forchheimer flow model that best-fit the experimental data. In steady and oscillating flows permeabilities and inertial coefficients are of the same magnitude order. Inertial coefficients decrease when the porosities increase.
format	article
author	Dellali Emna Lanzetta François Begot Sylvie Gavignet Eric Rauch Jean-Yves
author_facet	Dellali Emna Lanzetta François Begot Sylvie Gavignet Eric Rauch Jean-Yves
author_sort	Dellali Emna
title	Data reduction of friction factor, permeability and inertial coefficient for a compressible gas flow through a milli-regenerator
title_short	Data reduction of friction factor, permeability and inertial coefficient for a compressible gas flow through a milli-regenerator
title_full	Data reduction of friction factor, permeability and inertial coefficient for a compressible gas flow through a milli-regenerator
title_fullStr	Data reduction of friction factor, permeability and inertial coefficient for a compressible gas flow through a milli-regenerator
title_full_unstemmed	Data reduction of friction factor, permeability and inertial coefficient for a compressible gas flow through a milli-regenerator
title_sort	data reduction of friction factor, permeability and inertial coefficient for a compressible gas flow through a milli-regenerator
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/38629b17a5d74b2ab9ec59d62fe08f98
work_keys_str_mv	AT dellaliemna datareductionoffrictionfactorpermeabilityandinertialcoefficientforacompressiblegasflowthroughamilliregenerator AT lanzettafrancois datareductionoffrictionfactorpermeabilityandinertialcoefficientforacompressiblegasflowthroughamilliregenerator AT begotsylvie datareductionoffrictionfactorpermeabilityandinertialcoefficientforacompressiblegasflowthroughamilliregenerator AT gavigneteric datareductionoffrictionfactorpermeabilityandinertialcoefficientforacompressiblegasflowthroughamilliregenerator AT rauchjeanyves datareductionoffrictionfactorpermeabilityandinertialcoefficientforacompressiblegasflowthroughamilliregenerator
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Data reduction of friction factor, permeability and inertial coefficient for a compressible gas flow through a milli-regenerator

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