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Sarkar, Chiranjit
Publikationer (5 of 5) Visa alla publikationer
Sarkar, C., Westerberg, L.-G., Höglund, E. & Lundström, S. T. (2018). Numerical simulations of lubricating grease flow in a rectangular channel with and without restrictions. Tribology Transactions, 61(1), 144-156
Öppna denna publikation i ny flik eller fönster >>Numerical simulations of lubricating grease flow in a rectangular channel with and without restrictions
2018 (Engelska)Ingår i: Tribology Transactions, ISSN 1040-2004, E-ISSN 1547-397X, Vol. 61, nr 1, s. 144-156Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

This article presents numerical simulations of the laminar flow of lubricating greases in a channel with rectangular cross section. Three greases with different consistencies (NLGI grades 00, 1, and 2) have been considered in three different configurations composed of a rectangular channel without restrictions, one rectangular step restriction, and one double-lip restriction. The driving pressure drop over the channel spans from 30 to 250 kPa. The grease rheology is described by the Herschel-Bulkley rheology model, and both the numerical code and rheology model have been validated with analytical solutions and flow measurements using micro-particle image velocimetry.

Ort, förlag, år, upplaga, sidor
Taylor & Francis, 2018
Nationell ämneskategori
Strömningsmekanik och akustik Tribologi (ytteknik omfattande friktion, nötning och smörjning)
Forskningsämne
Strömningslära; Maskinelement
Identifikatorer
urn:nbn:se:ltu:diva-61479 (URN)10.1080/10402004.2017.1285090 (DOI)000432222500015 ()
Anmärkning

Validerad;2018;Nivå 2;2018-02-01 (rokbeg)

Tillgänglig från: 2017-01-17 Skapad: 2017-01-17 Senast uppdaterad: 2018-06-04Bibliografiskt granskad
Westerberg, L.-G., Sarkar, C., Farré, J., Lundström, S. & Höglund, E. (2017). Lubricating grease flow in a double restriction seal geometry: a Computational Fluid Dynamics approach. Tribology letters, 65(3), Article ID 82.
Öppna denna publikation i ny flik eller fönster >>Lubricating grease flow in a double restriction seal geometry: a Computational Fluid Dynamics approach
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2017 (Engelska)Ingår i: Tribology letters, ISSN 1023-8883, E-ISSN 1573-2711, Vol. 65, nr 3, artikel-id 82Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In this paper, numerical simulations of lubricating grease flow in the grease pocket of a double restriction seal geometry using computational fluid dynamics are presented. The grease is treated as a single-phase Herschel–Bulkley fluid with different rheological properties corresponding to NLGI grade 00, 1 and 2. The numerical code and rheology model have been validated with a semi-analytical solution based on flow measurements using microparticle image velocimetry. The flow has been modelled for low and high rotational speeds driving the flow, and elevated temperatures. Also, the evolution of contaminant particles in the grease pocket is investigated. It was found that the flow and velocity distribution in the pocket—and consequently the contaminant particle concentration evolution, is characterized by the shear thinning rheology of the grease. With higher shear rates in the grease and higher temperatures, the grease approaches a more Newtonian type of behaviour leading to a reduced yield and shear thinning characteristics directly affecting the grease ability to transport contaminant particles.

Ort, förlag, år, upplaga, sidor
Springer, 2017
Nationell ämneskategori
Strömningsmekanik och akustik Tribologi (ytteknik omfattande friktion, nötning och smörjning)
Forskningsämne
Strömningslära; Maskinelement
Identifikatorer
urn:nbn:se:ltu:diva-63306 (URN)10.1007/s11249-017-0864-2 (DOI)000405488400008 ()2-s2.0-85019554610 (Scopus ID)
Anmärkning

Validerad; 2017; Nivå 2; 2017-05-24 (andbra)

Tillgänglig från: 2017-05-10 Skapad: 2017-05-10 Senast uppdaterad: 2018-07-10Bibliografiskt granskad
Westerberg, L.-G., Höglund, E. & Sarkar, C. (2016). Modelling and experimental validation of grease flow. Eurogrease Magazine (4), 17-32
Öppna denna publikation i ny flik eller fönster >>Modelling and experimental validation of grease flow
2016 (Engelska)Ingår i: Eurogrease Magazine, nr 4, s. 17-32Artikel i tidskrift (Övrigt vetenskapligt) Published
Nationell ämneskategori
Signalbehandling Tribologi (ytteknik omfattande friktion, nötning och smörjning)
Forskningsämne
Maskinelement; Signalbehandling
Identifikatorer
urn:nbn:se:ltu:diva-61057 (URN)
Tillgänglig från: 2016-12-13 Skapad: 2016-12-13 Senast uppdaterad: 2018-03-09Bibliografiskt granskad
Westerberg, L.-G., Höglund, E. & Sarkar, C. (2016). Modelling and experimental validation of lubricating grease flow (ed.). Paper presented at ELGI Annual General Meeting : 16/04/2016 - 19/04/2016. Paper presented at ELGI Annual General Meeting : 16/04/2016 - 19/04/2016.
Öppna denna publikation i ny flik eller fönster >>Modelling and experimental validation of lubricating grease flow
2016 (Engelska)Konferensbidrag, Enbart muntlig presentation (Refereegranskat)
Abstract [en]

Being able to fully model the flow dynamics of grease, including phase separation, will be highly valuable in the design of lubricated machine elements such as rolling element bearings. Complete models will also be a valuable tool in the process of providing tailor-made greases for different applications. An understanding of the grease flow dynamics enables prediction of grease distribution for optimum lubrication and for the migration of wear- and contaminant particles. In this paper the potential of combined analytical modelling, flow visualizations, and numerical modelling in grease flow dynamics is presented. Specifically, the relation between the rheology of the grease and its impact on the flow motion is of interest in combination with validation of the numerical models in simplified geometries. The numerical models then enable simulations in more complex geometries of particular interest for the grease and bearing industry. It is shown that grease flow is heavily influenced by its non-Newtonian properties and the shear rates in the contact, resulting in distinct regions of yielded and un-yielded grease. Further, the numerical models are shown to match well with experiments and analytical models, enabling numerical models on more complicated geometries.

Nationell ämneskategori
Strömningsmekanik och akustik Tribologi (ytteknik omfattande friktion, nötning och smörjning)
Forskningsämne
Strömningslära; Maskinelement
Identifikatorer
urn:nbn:se:ltu:diva-27623 (URN)11f18ac7-117b-465d-ad80-3db6b169c403 (Lokalt ID)11f18ac7-117b-465d-ad80-3db6b169c403 (Arkivnummer)11f18ac7-117b-465d-ad80-3db6b169c403 (OAI)
Konferens
ELGI Annual General Meeting : 16/04/2016 - 19/04/2016
Anmärkning
Godkänd; 2016; 20160425 (andbra)Tillgänglig från: 2016-09-30 Skapad: 2016-09-30 Senast uppdaterad: 2018-03-09Bibliografiskt granskad
Westerberg, L.-G., Höglund, E. & Sarkar, C. (2016). On the Flow of Lubricating Greases: a Computational Fluid Dynamics Approach. In: : . Paper presented at STLE Tribology Frontiers Conference, Chicago, Nov. 13-15, 2016.
Öppna denna publikation i ny flik eller fönster >>On the Flow of Lubricating Greases: a Computational Fluid Dynamics Approach
2016 (Engelska)Konferensbidrag, Muntlig presentation med publicerat abstract (Refereegranskat)
Abstract [en]

Being able to model the flow dynamics of grease is highly valuable in the design of lubricated machine elements such as rolling element bearings. An understanding of the grease flow dynamics enables prediction of grease distribution for optimum lubrication and for the migration of wear- and contaminant particles. In this paper the potential of combined analytical modelling, flow visualizations, and numerical modelling in grease flow dynamics is presented. Specifically, the relation between the rheology of the grease and its impact on the flow motion is of interest in combination with validation of the numerical models in simplified geometries. The numerical models then enable simulations in more complex geometries of particular interest for the grease and bearing industry. It is shown that grease flow is heavily influenced by its non-Newtonian properties and the shear rates in the contact, resulting in distinct regions of yielded and un-yielded grease. Further, the numerical models are shown to match well with experiments and analytical models, enabling numerical models on more intricate geometries in the bearing industry.

Nationell ämneskategori
Strömningsmekanik och akustik Tribologi (ytteknik omfattande friktion, nötning och smörjning)
Forskningsämne
Strömningslära; Maskinelement
Identifikatorer
urn:nbn:se:ltu:diva-61046 (URN)
Konferens
STLE Tribology Frontiers Conference, Chicago, Nov. 13-15, 2016
Tillgänglig från: 2016-12-13 Skapad: 2016-12-13 Senast uppdaterad: 2018-03-09Bibliografiskt granskad
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