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Détail de l'auteur
Auteur Zhipeng Duan
Documents disponibles écrits par cet auteur
Affiner la rechercheEffects of axial corrugated roughness on low Reynolds number slip flow and continuum flow in microtubes / Zhipeng Duan in Journal of heat transfer, Vol. 132 N° 4 (n° spécial) (Avril 2010)
in Journal of heat transfer > Vol. 132 N° 4 (n° spécial) (Avril 2010) . - pp. [041001-1/9]
Titre : Effects of axial corrugated roughness on low Reynolds number slip flow and continuum flow in microtubes Type de document : texte imprimé Auteurs : Zhipeng Duan, Auteur ; Y. S. Muzychka, Auteur Article en page(s) : pp. [041001-1/9] Note générale : Physique Langues : Anglais (eng) Mots-clés : Corrugations Roughness Perturbation Slip flow Microtubes Index. décimale : 536 Chaleur. Thermodynamique Résumé : The effect of axial corrugated surface roughness on fully developed laminar flow in microtubes is investigated. The radius of a microtube varies with the axial distance due to corrugated roughness. The Stokes equation is solved using a perturbation method with slip at the boundary. Analytical models are developed to predict friction factor and pressure drop in corrugated rough microtubes for continuum flow and slip flow. The developed model proposes an explanation on the observed phenomenon that some experimental pressure drop results for microchannel flow have shown a significant increase due to roughness. The developed model for slip flow illustrates the coupled effects between velocity slip and small corrugated roughness. Compressibility effect has also been examined and simple models are proposed to predict the pressure distribution and mass flow rate for slip flow in corrugated rough microtubes.
DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] [article] Effects of axial corrugated roughness on low Reynolds number slip flow and continuum flow in microtubes [texte imprimé] / Zhipeng Duan, Auteur ; Y. S. Muzychka, Auteur . - pp. [041001-1/9].
Physique
Langues : Anglais (eng)
in Journal of heat transfer > Vol. 132 N° 4 (n° spécial) (Avril 2010) . - pp. [041001-1/9]
Mots-clés : Corrugations Roughness Perturbation Slip flow Microtubes Index. décimale : 536 Chaleur. Thermodynamique Résumé : The effect of axial corrugated surface roughness on fully developed laminar flow in microtubes is investigated. The radius of a microtube varies with the axial distance due to corrugated roughness. The Stokes equation is solved using a perturbation method with slip at the boundary. Analytical models are developed to predict friction factor and pressure drop in corrugated rough microtubes for continuum flow and slip flow. The developed model proposes an explanation on the observed phenomenon that some experimental pressure drop results for microchannel flow have shown a significant increase due to roughness. The developed model for slip flow illustrates the coupled effects between velocity slip and small corrugated roughness. Compressibility effect has also been examined and simple models are proposed to predict the pressure distribution and mass flow rate for slip flow in corrugated rough microtubes.
DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...]
in Transactions of the ASME . Journal of fluids engineering > Vol. 130 N° 3 (Mars 2008) . - 7 p.
Titre : Effects of corrugated roughness on developed laminar flow in microtubes Type de document : texte imprimé Auteurs : Zhipeng Duan, Auteur ; Y. S. Muzychka, Auteur Année de publication : 2009 Article en page(s) : 7 p. Note générale : Fluids engineering Langues : Anglais (eng) Mots-clés : Corrugated surface roughness; laminar flow; momentum equation Résumé : The effects of corrugated surface roughness on developed laminar flow in microtubes are investigated. The momentum equation is solved using a perturbation method with slip at the boundary. Novel analytical models are developed to predict friction factor and pressure drop in corrugated rough microtubes for continuum flow and slip flow. The developed model proposes an explanation on the observed phenomenon that some experimental pressure drop results for microchannel flow have shown a significant increase (15–50%) due to roughness. The developed model for slip flow illustrates the coupled effects between velocity slip and small corrugated roughness. Compressibility effect has also been examined and simple models are proposed to predict the pressure distribution and mass flow rate for slip flow in corrugated rough microtubes. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/Issue.aspx?issueID=27301 [...] [article] Effects of corrugated roughness on developed laminar flow in microtubes [texte imprimé] / Zhipeng Duan, Auteur ; Y. S. Muzychka, Auteur . - 2009 . - 7 p.
Fluids engineering
Langues : Anglais (eng)
in Transactions of the ASME . Journal of fluids engineering > Vol. 130 N° 3 (Mars 2008) . - 7 p.
Mots-clés : Corrugated surface roughness; laminar flow; momentum equation Résumé : The effects of corrugated surface roughness on developed laminar flow in microtubes are investigated. The momentum equation is solved using a perturbation method with slip at the boundary. Novel analytical models are developed to predict friction factor and pressure drop in corrugated rough microtubes for continuum flow and slip flow. The developed model proposes an explanation on the observed phenomenon that some experimental pressure drop results for microchannel flow have shown a significant increase (15–50%) due to roughness. The developed model for slip flow illustrates the coupled effects between velocity slip and small corrugated roughness. Compressibility effect has also been examined and simple models are proposed to predict the pressure distribution and mass flow rate for slip flow in corrugated rough microtubes. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/Issue.aspx?issueID=27301 [...]
in Journal of heat transfer > Vol. 134 N° 1 (Janvier 2012) . - 06 p.
Titre : New correlative models for fully developed turbulent heat and mass transfer in circular and noncircular ducts Type de document : texte imprimé Auteurs : Zhipeng Duan, Auteur Année de publication : 2012 Article en page(s) : 06 p. Note générale : Heat transfer Langues : Anglais (eng) Mots-clés : Heat transfer Mass transfer Pipe flow Turbulence Index. décimale : 536 Chaleur. Thermodynamique Résumé : Fully developed turbulent flow in noncircular ducts is examined, and simple models are proposed to predict the friction, heat and mass transfer in most common noncircular channels. It is found that the square root of cross-sectional area is the relatively more appropriate length scale to use in defining the dimensionless parameters to ensure similarity between the circular and most noncircular ducts. By using the dimensionless parameters based on the square root of cross-sectional area, it is demonstrated that the circular tube relations may be applied to most noncircular ducts eliminating large errors in estimation. As turbulent transport phenomena are inherently complex and there, currently, is no extensive experimental data for turbulent heat and mass transfer in noncircular ducts, the simple models are valuable in spite of their limitations. DEWEY : 536 ISSN : 0022-1481 En ligne : http://www.asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO00013400 [...] [article] New correlative models for fully developed turbulent heat and mass transfer in circular and noncircular ducts [texte imprimé] / Zhipeng Duan, Auteur . - 2012 . - 06 p.
Heat transfer
Langues : Anglais (eng)
in Journal of heat transfer > Vol. 134 N° 1 (Janvier 2012) . - 06 p.
Mots-clés : Heat transfer Mass transfer Pipe flow Turbulence Index. décimale : 536 Chaleur. Thermodynamique Résumé : Fully developed turbulent flow in noncircular ducts is examined, and simple models are proposed to predict the friction, heat and mass transfer in most common noncircular channels. It is found that the square root of cross-sectional area is the relatively more appropriate length scale to use in defining the dimensionless parameters to ensure similarity between the circular and most noncircular ducts. By using the dimensionless parameters based on the square root of cross-sectional area, it is demonstrated that the circular tube relations may be applied to most noncircular ducts eliminating large errors in estimation. As turbulent transport phenomena are inherently complex and there, currently, is no extensive experimental data for turbulent heat and mass transfer in noncircular ducts, the simple models are valuable in spite of their limitations. DEWEY : 536 ISSN : 0022-1481 En ligne : http://www.asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO00013400 [...]
in Journal of heat transfer > Vol. 134 N° 7 (Juillet 2012) . - 01 p.
Titre : New correlative models for fully developed turbulent heat and mass transfer in circular and noncircular ducts Type de document : texte imprimé Auteurs : Zhipeng Duan, Auteur Année de publication : 2012 Article en page(s) : 01 p. Note générale : heat transfer Langues : Anglais (eng) Note de contenu : Erratum
In the paper od Duan [1], there is an error in the range of the Prandtl number (Pr) for Eqs.(14) and (15). The correlation of Notter and Sleicher [2], Eqs. (14) and (15), are valid for 0.004<Pr<0.1 not 0.04<Pr<0.1.
The author would like to acknowledge M. M. Awad of Mansoura university, Mansoura, Egypt, for bringing this to my attentionDEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000007 [...] [article] New correlative models for fully developed turbulent heat and mass transfer in circular and noncircular ducts [texte imprimé] / Zhipeng Duan, Auteur . - 2012 . - 01 p.
heat transfer
Langues : Anglais (eng)
in Journal of heat transfer > Vol. 134 N° 7 (Juillet 2012) . - 01 p.
Note de contenu : Erratum
In the paper od Duan [1], there is an error in the range of the Prandtl number (Pr) for Eqs.(14) and (15). The correlation of Notter and Sleicher [2], Eqs. (14) and (15), are valid for 0.004<Pr<0.1 not 0.04<Pr<0.1.
The author would like to acknowledge M. M. Awad of Mansoura university, Mansoura, Egypt, for bringing this to my attentionDEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000007 [...]
in Transactions of the ASME . Journal of fluids engineering > Vol. 134 N° 6 (Juin 2012) . - 10 p.
Titre : Pressure drop for fully developed turbulent flow in circular and noncircular ducts Type de document : texte imprimé Auteurs : Zhipeng Duan, Auteur ; M. M. Yovanovich, Auteur ; Y. S. Muzychka, Auteur Année de publication : 2012 Article en page(s) : 10 p. Note générale : fluids engineering Langues : Anglais (eng) Mots-clés : turbulent flow; pressure drop; friction factor; noncircular; length scale; square root of flow area; hydraulic diameter Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The objective of this paper is to furnish the engineer with a simple and convenient means of estimating frictional pressure drop in ducts and the original physical behavior can be clearly reflected. Fully developed turbulent flow frictional pressure drop in noncircular ducts is examined. Simple models are proposed to predict the frictional pressure drop in smooth and rough noncircular channels. Through the selection of a novel characteristic length scale, the square root of the cross-sectional area, the effect of duct shape has been minimized. The proposed models have an accuracy of 6% for most common duct shapes of engineering practice and can be used to predict pressure drop of fully developed turbulent flow in noncircular ducts. It is found that the hydraulic diameter is not the appropriate length scale to use in defining the Reynolds number to ensure similarity between the circular and noncircular ducts. By using the Reynolds number based on the square root of the cross-sectional area, it is demonstrated that the circular tube relations may be applied to noncircular ducts eliminating large errors in estimation of pressure drop. The square root of the cross-sectional area is an appropriate characteristic dimension applicable to most duct geometries. The dimensionless mean wall shear stress is a desirable dimensionless parameter to describe fluid flow physical behavior so that fluid flow problems can be solved in the simple and direct manner. The dimensionless mean wall shear stress is presented graphically and appears more general and reasonable to reflect the fluid flow physical behavior than the traditional Moody diagram. DEWEY : 620.1 ISSN : 0098-2202 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JFEGA4000134000006 [...] [article] Pressure drop for fully developed turbulent flow in circular and noncircular ducts [texte imprimé] / Zhipeng Duan, Auteur ; M. M. Yovanovich, Auteur ; Y. S. Muzychka, Auteur . - 2012 . - 10 p.
fluids engineering
Langues : Anglais (eng)
in Transactions of the ASME . Journal of fluids engineering > Vol. 134 N° 6 (Juin 2012) . - 10 p.
Mots-clés : turbulent flow; pressure drop; friction factor; noncircular; length scale; square root of flow area; hydraulic diameter Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The objective of this paper is to furnish the engineer with a simple and convenient means of estimating frictional pressure drop in ducts and the original physical behavior can be clearly reflected. Fully developed turbulent flow frictional pressure drop in noncircular ducts is examined. Simple models are proposed to predict the frictional pressure drop in smooth and rough noncircular channels. Through the selection of a novel characteristic length scale, the square root of the cross-sectional area, the effect of duct shape has been minimized. The proposed models have an accuracy of 6% for most common duct shapes of engineering practice and can be used to predict pressure drop of fully developed turbulent flow in noncircular ducts. It is found that the hydraulic diameter is not the appropriate length scale to use in defining the Reynolds number to ensure similarity between the circular and noncircular ducts. By using the Reynolds number based on the square root of the cross-sectional area, it is demonstrated that the circular tube relations may be applied to noncircular ducts eliminating large errors in estimation of pressure drop. The square root of the cross-sectional area is an appropriate characteristic dimension applicable to most duct geometries. The dimensionless mean wall shear stress is a desirable dimensionless parameter to describe fluid flow physical behavior so that fluid flow problems can be solved in the simple and direct manner. The dimensionless mean wall shear stress is presented graphically and appears more general and reasonable to reflect the fluid flow physical behavior than the traditional Moody diagram. DEWEY : 620.1 ISSN : 0098-2202 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JFEGA4000134000006 [...]
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