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Westerberg, Lars-GöranORCID iD iconorcid.org/0000-0001-5294-1855
Publications (10 of 77) Show all publications
Schillings, A., Slapak, R., Nilsson, H., Yamauchi, M., Dandouras, I. & Westerberg, L.-G. (2019). Earth atmospheric loss through the plasma mantle and its dependence onsolar wind parameters. In: : . Paper presented at EGU General Assembly 2019, 7–12 April 2019, Vienna, Austria.
Open this publication in new window or tab >>Earth atmospheric loss through the plasma mantle and its dependence onsolar wind parameters
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2019 (English)Conference paper (Refereed)
National Category
Aerospace Engineering Fluid Mechanics and Acoustics
Research subject
Atmospheric science; Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-73466 (URN)
Conference
EGU General Assembly 2019, 7–12 April 2019, Vienna, Austria
Available from: 2019-04-05 Created: 2019-04-05 Last updated: 2019-04-05Bibliographically approved
Slapak, R., Schillings, A., Nilsson, H., Yamauchi, M. & Westerberg, L.-G. (2018). Corrigendum to Atmospheric loss from the dayside open polar region and its dependence on geomagnetic activity: Implications for atmospheric escape on evolutionary time scales, published in Ann. Geophys., 35, 721–731,2017 [Letter to the editor]. Annales Geophysicae
Open this publication in new window or tab >>Corrigendum to Atmospheric loss from the dayside open polar region and its dependence on geomagnetic activity: Implications for atmospheric escape on evolutionary time scales, published in Ann. Geophys., 35, 721–731,2017
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2018 (English)In: Annales Geophysicae, ISSN 0992-7689, E-ISSN 1432-0576Article in journal, Letter (Refereed) Published
Place, publisher, year, edition, pages
Copernicus Publications, 2018
National Category
Aerospace Engineering Fluid Mechanics and Acoustics
Research subject
Atmospheric science; Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-68587 (URN)10.5194/angeo-35-721-2017-corrigendum (DOI)
Available from: 2018-05-02 Created: 2018-05-02 Last updated: 2018-11-20Bibliographically approved
Duenas Dobrowolski, J., Gawlinski, M., Paszkowski, M., Westerberg, L.-G. & Höglund, E. (2018). Experimental Study of Lubricating Grease Flow inside the Gap of a Labyrinth Seal Using Microparticle Image Velocimetry. Tribology Transactions, 61(1), 31-40
Open this publication in new window or tab >>Experimental Study of Lubricating Grease Flow inside the Gap of a Labyrinth Seal Using Microparticle Image Velocimetry
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2018 (English)In: Tribology Transactions, ISSN 1040-2004, E-ISSN 1547-397X, Vol. 61, no 1, p. 31-40Article in journal (Refereed) Published
Abstract [en]

In this study, the flow of lubricating greases in a labyrinth seal geometry is studied using microparticle image velocimetry (µPIV). The aim is to evaluate the grease velocity distribution inside the gap of a labyrinth seal and to find a relationship between the grease consistency and the transferred speed from the rotating ring in order to choose the correct grease as a sealing medium. In addition, the grease flow characteristics are important for the understanding of fracture due to grease layer displacement. For these purposes, four greases with different rheological properties were used in µPIV experiments. It was found that the grease consistency plays a crucial role in speed development as well as the grease composition and presence of a slip effect at the grease–rotating wall interface.

Place, publisher, year, edition, pages
Taylor & Francis, 2018
National Category
Fluid Mechanics and Acoustics Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Fluid Mechanics; Machine Elements
Identifiers
urn:nbn:se:ltu:diva-61056 (URN)10.1080/10402004.2016.1271928 (DOI)000432222500004 ()
Note

Validerad;2018;Nivå 2;2018-01-31 (rokbeg)

Available from: 2016-12-13 Created: 2016-12-13 Last updated: 2018-06-04Bibliographically approved
Karami, F., Nadooshan, A. A., Westerberg, L.-G. & Tadi Beni, Y. (2018). Nano-fluid flow in a catheterized tapered artery: Consistent couple stress-theory and wall slip. Journal of thermal analysis and calorimetry (Print)
Open this publication in new window or tab >>Nano-fluid flow in a catheterized tapered artery: Consistent couple stress-theory and wall slip
2018 (English)In: Journal of thermal analysis and calorimetry (Print), ISSN 1388-6150, E-ISSN 1588-2926Article in journal (Refereed) Epub ahead of print
Abstract [en]

This study was conducted with the aim of investigating the Newtonian nanofluid flow in a catheterized tapered artery through using a completely consistent couple stress theory. In the process of carrying out this study, the slip condition at the arterial wall and the catheter, as well as, the permeability was taken into account. Further, the velocity, temperature, and concentration profiles were analytically modeled and the effect of the length scale on these profiles was well presented through the way it influences small-scale flows. The effect of the slip condition at the artery and catheter walls on the velocity was also investigated and revealed that any increase in the velocity leads to an increase in the slip velocity. Furthermore, the effect of other parameters such as the catheter diameter, shape, and height of the stenosis on these profiles was explored for all three artery geometries, i.e., diverging tapered artery, converging tapered artery, and non-tapered artery, respectively. The findings suggested that any increase in the catheter diameter and stenosis height can decrease the velocity and nanoparticle concentration profiles, while the temperature profile increases. It was also found that by increasing the stenosis shape parameter the velocity and concentration profiles increase and temperature decreases.

Place, publisher, year, edition, pages
Springer, 2018
Keywords
Catheterized artery, Couple stress, Nanofluid, Slip velocity, Galerkin method
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-71601 (URN)10.1007/s10973-018-7930-3 (DOI)
Available from: 2018-11-15 Created: 2018-11-15 Last updated: 2018-12-07
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
Open this publication in new window or tab >>Numerical simulations of lubricating grease flow in a rectangular channel with and without restrictions
2018 (English)In: Tribology Transactions, ISSN 1040-2004, E-ISSN 1547-397X, Vol. 61, no 1, p. 144-156Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
Taylor & Francis, 2018
National Category
Fluid Mechanics and Acoustics Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Fluid Mechanics; Machine Elements
Identifiers
urn:nbn:se:ltu:diva-61479 (URN)10.1080/10402004.2017.1285090 (DOI)000432222500015 ()
Note

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

Available from: 2017-01-17 Created: 2017-01-17 Last updated: 2018-06-04Bibliographically approved
Schillings, A., Slapak, R., Nilsson, H., Yamauchi, M. & Westerberg, L.-G. (2017). Atmospheric loss during major geomagnetic storms: Cluster observations. In: : . Paper presented at European Geosciences Union General Assembly 2017, Vienna, Austria, 23-28 April 2017.
Open this publication in new window or tab >>Atmospheric loss during major geomagnetic storms: Cluster observations
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2017 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Fluid Mechanics and Acoustics Aerospace Engineering
Research subject
Fluid Mechanics; Atmospheric science
Identifiers
urn:nbn:se:ltu:diva-62336 (URN)
Conference
European Geosciences Union General Assembly 2017, Vienna, Austria, 23-28 April 2017
Available from: 2017-03-08 Created: 2017-03-08 Last updated: 2017-11-24Bibliographically approved
Slapak, R., Schillings, A., Nilsson, H., Yamauchi, M. & Westerberg, L.-G. (2017). Atmospheric loss from the dayside open polar region and its dependence on geomagnetic activity: Implications for atmospheric escape on evolutionary time scales. Annales Geophysicae, 35(3), 721-731
Open this publication in new window or tab >>Atmospheric loss from the dayside open polar region and its dependence on geomagnetic activity: Implications for atmospheric escape on evolutionary time scales
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2017 (English)In: Annales Geophysicae, ISSN 0992-7689, E-ISSN 1432-0576, Vol. 35, no 3, p. 721-731Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Copernicus Publications, 2017
National Category
Aerospace Engineering Fluid Mechanics and Acoustics
Research subject
Atmospheric science; Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-63305 (URN)10.5194/angeo-35-721-2017 (DOI)000403359500002 ()2-s2.0-85020723185 (Scopus ID)
Note

Validerad;2017;Nivå 2;2017-06-30 (andbra)

Available from: 2017-05-10 Created: 2017-05-10 Last updated: 2018-11-20Bibliographically approved
Slapak, R., Nilsson, H., Schillings, A., Yamauchi, M., Westerberg, L.-G. & Dandouras, I. (2017). Atmospheric outflow from the terrestrial magnetosphere: implications forescape on evolutionary time scales. In: : . Paper presented at European Geosciences Union General Assembly 2017, Vienna, Austria, 23-28 April 2017.
Open this publication in new window or tab >>Atmospheric outflow from the terrestrial magnetosphere: implications forescape on evolutionary time scales
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2017 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Fluid Mechanics and Acoustics Aerospace Engineering
Research subject
Fluid Mechanics; Atmospheric science
Identifiers
urn:nbn:se:ltu:diva-62328 (URN)
Conference
European Geosciences Union General Assembly 2017, Vienna, Austria, 23-28 April 2017
Available from: 2017-03-08 Created: 2017-03-08 Last updated: 2017-11-24Bibliographically approved
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.
Open this publication in new window or tab >>Lubricating grease flow in a double restriction seal geometry: a Computational Fluid Dynamics approach
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2017 (English)In: Tribology letters, ISSN 1023-8883, E-ISSN 1573-2711, Vol. 65, no 3, article id 82Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
Springer, 2017
National Category
Fluid Mechanics and Acoustics Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Fluid Mechanics; Machine Elements
Identifiers
urn:nbn:se:ltu:diva-63306 (URN)10.1007/s11249-017-0864-2 (DOI)000405488400008 ()2-s2.0-85019554610 (Scopus ID)
Note

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

Available from: 2017-05-10 Created: 2017-05-10 Last updated: 2018-07-10Bibliographically approved
Barabash, V., Ejemalm, J., Kuhn, T., Milz, M., Molin, S., Johansson, J. & Westerberg, L.-G. (2017). Masters Programs in Space Science and Engineering in Northern Sweden. In: : . Paper presented at 68th International Astronautical Congress, Adelaide, Australia, 25 – 29 September 2017 (pp. 11179-11191).
Open this publication in new window or tab >>Masters Programs in Space Science and Engineering in Northern Sweden
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2017 (English)Conference paper, Published paper (Refereed)
Keywords
rymd, space, Master, education, engineering
National Category
Aerospace Engineering Other Electrical Engineering, Electronic Engineering, Information Engineering Fluid Mechanics and Acoustics
Research subject
Atmospheric science; Industrial Electronics; Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-65521 (URN)2-s2.0-85051439897 (Scopus ID)9781510855373 (ISBN)
Conference
68th International Astronautical Congress, Adelaide, Australia, 25 – 29 September 2017
Projects
342
Available from: 2017-09-07 Created: 2017-09-07 Last updated: 2018-08-23Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-5294-1855

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