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Détail de l'auteur
Auteur Andrey V. Kuznetsov
Documents disponibles écrits par cet auteur
Affiner la rechercheForced convection in a channel partly occupied by a bidisperse porous medium / D. A. Nield in Journal of heat transfer, Vol. 133 N° 7 (Juillet 2011)
[article]
in Journal of heat transfer > Vol. 133 N° 7 (Juillet 2011) . - pp. [072601/1-9]
Titre : Forced convection in a channel partly occupied by a bidisperse porous medium : symmetric case Type de document : texte imprimé Auteurs : D. A. Nield, Auteur ; Andrey V. Kuznetsov, Auteur Année de publication : 2011 Article en page(s) : pp. [072601/1-9] Note générale : Physique Langues : Anglais (eng) Mots-clés : Bidisperse porous medium Forced convection Channel Beavers-Joseph condition Index. décimale : 536 Chaleur. Thermodynamique Résumé : An analytic solution is obtained for the problem of fully developed forced convection in a channel between parallel plane walls, partly occupied by a bidisperse porous medium (BDPM) and partly by a fluid clear of solid material, the distribution of material being symmetrical with the BDPM forming either the core or the sheath portion of the channel. The case of uniform flux boundaries is considered. For the porous medium, a two-velocity two-temperature model based on Darcy's law is employed and the Beavers–Joseph interface condition is imposed. In each case, Nusselt number values are obtained in terms of various parameters.
DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO00013300 [...] [article] Forced convection in a channel partly occupied by a bidisperse porous medium : symmetric case [texte imprimé] / D. A. Nield, Auteur ; Andrey V. Kuznetsov, Auteur . - 2011 . - pp. [072601/1-9].
Physique
Langues : Anglais (eng)
in Journal of heat transfer > Vol. 133 N° 7 (Juillet 2011) . - pp. [072601/1-9]
Mots-clés : Bidisperse porous medium Forced convection Channel Beavers-Joseph condition Index. décimale : 536 Chaleur. Thermodynamique Résumé : An analytic solution is obtained for the problem of fully developed forced convection in a channel between parallel plane walls, partly occupied by a bidisperse porous medium (BDPM) and partly by a fluid clear of solid material, the distribution of material being symmetrical with the BDPM forming either the core or the sheath portion of the channel. The case of uniform flux boundaries is considered. For the porous medium, a two-velocity two-temperature model based on Darcy's law is employed and the Beavers–Joseph interface condition is imposed. In each case, Nusselt number values are obtained in terms of various parameters.
DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO00013300 [...] Influence of geometry on starting vortex and ejector performance / Zheng, Fei in Transactions of the ASME . Journal of fluids engineering, Vol. 133 N° 5 (Mai 2011)
[article]
in Transactions of the ASME . Journal of fluids engineering > Vol. 133 N° 5 (Mai 2011) . - 08 p.
Titre : Influence of geometry on starting vortex and ejector performance Type de document : texte imprimé Auteurs : Zheng, Fei, Auteur ; Andrey V. Kuznetsov, Auteur ; Roberts, William L., Auteur Année de publication : 2011 Article en page(s) : 08 p. Note générale : Fluids engineering Langues : Anglais (eng) Mots-clés : Acoustic waves Detonation waves Engines Jets Navier-Stokes equations Propulsion Vortices Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : For many propulsion devices, the thrust may be augmented considerably by adding a passive ejector, and these devices are especially attractive for unsteady propulsion systems such as pulse detonation engines and pulsejets. Starting vortices from these unsteady devices dominate the flowfield and control to a great extent the level of the thrust augmentation. Therefore, it is of fundamental interest to understand the geometric influences on the starting vortex and how these manifest themselves in augmenter/ejector performance. An unsteady Reynolds averaged Navier–Stokes calculation was used to study the physics of a starting vortex generated at the exit of a pulsed jet and its interaction with an ejector. A 50 cm long pulsejet (typical hobby scale, allowing comparison with experimental data) with a circular exit was modeled as the resonant driving source and used to suggest an optimal ejector geometry and relative position. Computed limit-cycle thrust augmentation values compared favorably to experimentally obtained values for the same ejector geometries. Results suggest that the optimal diameter of the ejector is related to its relative position, dictated by the trajectory of the vortex toroid. The effect of the length of the ejector (which determines the natural frequency of the ejector, related to the acoustic processes occurring in the ejector) on overall performance was also investigated and shown to be less important than the ejector diameter. DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JFEGA400013 [...] [article] Influence of geometry on starting vortex and ejector performance [texte imprimé] / Zheng, Fei, Auteur ; Andrey V. Kuznetsov, Auteur ; Roberts, William L., Auteur . - 2011 . - 08 p.
Fluids engineering
Langues : Anglais (eng)
in Transactions of the ASME . Journal of fluids engineering > Vol. 133 N° 5 (Mai 2011) . - 08 p.
Mots-clés : Acoustic waves Detonation waves Engines Jets Navier-Stokes equations Propulsion Vortices Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : For many propulsion devices, the thrust may be augmented considerably by adding a passive ejector, and these devices are especially attractive for unsteady propulsion systems such as pulse detonation engines and pulsejets. Starting vortices from these unsteady devices dominate the flowfield and control to a great extent the level of the thrust augmentation. Therefore, it is of fundamental interest to understand the geometric influences on the starting vortex and how these manifest themselves in augmenter/ejector performance. An unsteady Reynolds averaged Navier–Stokes calculation was used to study the physics of a starting vortex generated at the exit of a pulsed jet and its interaction with an ejector. A 50 cm long pulsejet (typical hobby scale, allowing comparison with experimental data) with a circular exit was modeled as the resonant driving source and used to suggest an optimal ejector geometry and relative position. Computed limit-cycle thrust augmentation values compared favorably to experimentally obtained values for the same ejector geometries. Results suggest that the optimal diameter of the ejector is related to its relative position, dictated by the trajectory of the vortex toroid. The effect of the length of the ejector (which determines the natural frequency of the ejector, related to the acoustic processes occurring in the ejector) on overall performance was also investigated and shown to be less important than the ejector diameter. DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JFEGA400013 [...] Modeling bidirectional transport of new and used organelles in fast axonal transport in neurons / Andrey V. Kuznetsov in Journal of heat transfer, Vol. 133 N° 1(N° Spécial) (Janvier 2011)
[article]
in Journal of heat transfer > Vol. 133 N° 1(N° Spécial) (Janvier 2011) . - pp. [011007/1-9]
Titre : Modeling bidirectional transport of new and used organelles in fast axonal transport in neurons Type de document : texte imprimé Auteurs : Andrey V. Kuznetsov, Auteur Année de publication : 2011 Article en page(s) : pp. [011007/1-9] Note générale : Physique Langues : Anglais (eng) Mots-clés : Molecular motors Fast axonal transport Neurons Axons and dendrites Intracellular organelles Vesicle traps Traffic jams Index. décimale : 536 Chaleur. Thermodynamique Résumé : This paper develops a model for simulating transport of newly synthesized material from the neuron body toward the synapse of the axon as well as transport of misfolded and aggregated proteins back to the neuron body for recycling. The model demonstrates that motor-assisted transport, much similar to diffusion, can occur due to a simple concentration difference between the cell body and the synapse; organelles heading to the synapse do not need to attach preferably to plus-end-directed molecular motors, same as organelles heading to the neuron body for recycling do not need to attach preferably to minus-end-directed molecular motors. The underlying mechanics of molecular-motor-assisted transport is such that organelles would be transported to the right place even if new and used organelles had the same probability of attachment to plus-end-directed (and minus-end-directed) motors. It is also demonstrated that the axon with organelle traps and a region with a reversed microtubule polarity would support much smaller organelle fluxes of both new and used organelles than a healthy axon. The flux of organelles is shown to decrease as the width of organelle traps increases.
DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] [article] Modeling bidirectional transport of new and used organelles in fast axonal transport in neurons [texte imprimé] / Andrey V. Kuznetsov, Auteur . - 2011 . - pp. [011007/1-9].
Physique
Langues : Anglais (eng)
in Journal of heat transfer > Vol. 133 N° 1(N° Spécial) (Janvier 2011) . - pp. [011007/1-9]
Mots-clés : Molecular motors Fast axonal transport Neurons Axons and dendrites Intracellular organelles Vesicle traps Traffic jams Index. décimale : 536 Chaleur. Thermodynamique Résumé : This paper develops a model for simulating transport of newly synthesized material from the neuron body toward the synapse of the axon as well as transport of misfolded and aggregated proteins back to the neuron body for recycling. The model demonstrates that motor-assisted transport, much similar to diffusion, can occur due to a simple concentration difference between the cell body and the synapse; organelles heading to the synapse do not need to attach preferably to plus-end-directed molecular motors, same as organelles heading to the neuron body for recycling do not need to attach preferably to minus-end-directed molecular motors. The underlying mechanics of molecular-motor-assisted transport is such that organelles would be transported to the right place even if new and used organelles had the same probability of attachment to plus-end-directed (and minus-end-directed) motors. It is also demonstrated that the axon with organelle traps and a region with a reversed microtubule polarity would support much smaller organelle fluxes of both new and used organelles than a healthy axon. The flux of organelles is shown to decrease as the width of organelle traps increases.
DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] The effect of local thermal nonequilibrium on the onset of convection in a nanofluid / D. A. Nield in Journal of heat transfer, Vol. 132 N° 5 (Mai 2010)
[article]
in Journal of heat transfer > Vol. 132 N° 5 (Mai 2010) . - pp. [052405-1/7]
Titre : The effect of local thermal nonequilibrium on the onset of convection in a nanofluid Type de document : texte imprimé Auteurs : D. A. Nield, Auteur ; Andrey V. Kuznetsov, Auteur Article en page(s) : pp. [052405-1/7] Note générale : Physique Langues : Anglais (eng) Mots-clés : Nanofluid Brownian motion Thermophoresis Rayleigh-Bénard problem Local thermal nonequilibrium Index. décimale : 536 Chaleur. Thermodynamique Résumé : The onset of convection in a horizontal layer of a nanofluid is studied analytically. The model used for the nanofluid incorporates the effects of Brownian motion and thermophoresis, and allows for local thermal nonequilibrium (LTNE) between the particle and fluid phases. The analysis reveals that in some circumstances, the effect of LTNE can be significant, but for a typical dilute nanofluid (with large Lewis number and with small particle-to-fluid heat capacity ratio), the effect is small.
DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&smode=strresults& [...] [article] The effect of local thermal nonequilibrium on the onset of convection in a nanofluid [texte imprimé] / D. A. Nield, Auteur ; Andrey V. Kuznetsov, Auteur . - pp. [052405-1/7].
Physique
Langues : Anglais (eng)
in Journal of heat transfer > Vol. 132 N° 5 (Mai 2010) . - pp. [052405-1/7]
Mots-clés : Nanofluid Brownian motion Thermophoresis Rayleigh-Bénard problem Local thermal nonequilibrium Index. décimale : 536 Chaleur. Thermodynamique Résumé : The onset of convection in a horizontal layer of a nanofluid is studied analytically. The model used for the nanofluid incorporates the effects of Brownian motion and thermophoresis, and allows for local thermal nonequilibrium (LTNE) between the particle and fluid phases. The analysis reveals that in some circumstances, the effect of LTNE can be significant, but for a typical dilute nanofluid (with large Lewis number and with small particle-to-fluid heat capacity ratio), the effect is small.
DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&smode=strresults& [...] The onset of convection in a layer of cellular porous material / D. A. Nield in Journal of heat transfer, Vol. 132 N° 7 (Juillet 2010)
[article]
in Journal of heat transfer > Vol. 132 N° 7 (Juillet 2010) . - pp. [074503-1/4]
Titre : The onset of convection in a layer of cellular porous material : effect of temperature-dependent conductivity arising from radiative transfer Type de document : texte imprimé Auteurs : D. A. Nield, Auteur ; Andrey V. Kuznetsov, Auteur Article en page(s) : pp. [074503-1/4] Note générale : Physique Langues : Anglais (eng) Mots-clés : Cellular porous medium Radiative heat transfer Temperature-dependent conductivity Onset of convection Horton-Rogers-Lapwood problem Index. décimale : 536 Chaleur. Thermodynamique Résumé : The onset of convection in a horizontal layer of a cellular porous material heated from below is investigated. The problem is formulated as a combined conductive-convective-radiative problem in which radiative heat transfer is treated as a diffusion process. The problem is relevant to cellular foams formed from plastics, ceramics, and metals. It is shown that the variation of conductivity with temperature above that of the cold boundary leads to an increase in the critical Rayleigh number (based on the conductivity of the fluid at that boundary temperature) and an increase in the critical wave number. On the other hand, the critical Rayleigh number based on the conductivity at the mean temperature decreases with increase in the thermal variation parameter if the radiative contribution to the effective conductivity is sufficiently large compared with the nonradiative component.
DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] [article] The onset of convection in a layer of cellular porous material : effect of temperature-dependent conductivity arising from radiative transfer [texte imprimé] / D. A. Nield, Auteur ; Andrey V. Kuznetsov, Auteur . - pp. [074503-1/4].
Physique
Langues : Anglais (eng)
in Journal of heat transfer > Vol. 132 N° 7 (Juillet 2010) . - pp. [074503-1/4]
Mots-clés : Cellular porous medium Radiative heat transfer Temperature-dependent conductivity Onset of convection Horton-Rogers-Lapwood problem Index. décimale : 536 Chaleur. Thermodynamique Résumé : The onset of convection in a horizontal layer of a cellular porous material heated from below is investigated. The problem is formulated as a combined conductive-convective-radiative problem in which radiative heat transfer is treated as a diffusion process. The problem is relevant to cellular foams formed from plastics, ceramics, and metals. It is shown that the variation of conductivity with temperature above that of the cold boundary leads to an increase in the critical Rayleigh number (based on the conductivity of the fluid at that boundary temperature) and an increase in the critical wave number. On the other hand, the critical Rayleigh number based on the conductivity at the mean temperature decreases with increase in the thermal variation parameter if the radiative contribution to the effective conductivity is sufficiently large compared with the nonradiative component.
DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...]