Analysis of the Thermo-Viscous Effect on Friction and Energy Dissipation in Oil Lubricated Interfaces

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

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Abstract

The last decade an increasing amount of work are performed with the aim of enhancing efficiency and reliability of fluid power components. Consequently, the loss mechanisms of lubricated tribological interfaces are of particular interest. This has led to development of sophisticated three-dimensional thermo-elastohydrodynamic lubrication models of fluid power components. The computational efforts involved in simulation with such models entail that design optimization are to some extend impractical. However, such models are also pursued in theoretical tribology with the aim to study loss and wear mechanisms, which is very difficult to study experimentally. In consequence, advanced numerical models are the state of the art approach in theoretical fluid power tribology research. However, a downside of modern numerical models is the inability to provide a practical tool for wide-scale parameter sweep investigations, due to computational effort, whereby analytical research in loss mechanisms still have certain advantages. In this paper, the thermo-viscous effect of a lubricant is included in an analytical study of the friction and energy dissipation of oil hydraulic thin-films. This analytical study is based on an asymptotic approximation of the laminar lubrication thermal field at low reduced Peclet and Brinkman number, where viscosity is included as a function of temperature. The asymptotic series is truncated at first order and used to derive an expression of the viscous friction on a sliding surface. This reveal an influence from the surface temperature gradient on the viscous friction, which id not revealed when applying classical isothermal analysis. The significance of the thermo-viscous effect on friction and energy dissipation is analyzed analytically in order to provide a qualitative insight to the relation between thermo-dynamic properties, film thickness, sliding velocity, and viscous friction.
Original languageEnglish
Title of host publicationProceedings of the 9th FPNI PhD Symposium on Fluid Power
Number of pages8
PublisherAmerican Society of Mechanical Engineers
Publication dateOct 2016
Article numberFPNI2016-1554
ISBN (Print)978-0-7918-5047-3
DOIs
Publication statusPublished - Oct 2016
Event9th FPNI Ph.D. Symposium on Fluid Power - Florianópolis, Brazil
Duration: 26 Oct 201628 Oct 2016

Conference

Conference9th FPNI Ph.D. Symposium on Fluid Power
CountryBrazil
CityFlorianópolis
Period26/10/201628/10/2016
SponsorFederal University of Santa Catarina (UFSC), Fluid Power Net International (FPNI)

Fingerprint

Energy dissipation
Friction
Tribology
Fluids
Numerical models
Elastohydrodynamic lubrication
Thermal gradients
Lubrication
Film thickness
Lubricants
Thermodynamic properties
Hydraulics
Wear of materials
Oils
Viscosity
Thin films
Temperature

Keywords

  • Friction
  • Energy dissipation

Cite this

Johansen, P., Roemer, D. B., Andersen, T. O., & Pedersen, H. C. (2016). Analysis of the Thermo-Viscous Effect on Friction and Energy Dissipation in Oil Lubricated Interfaces. In Proceedings of the 9th FPNI PhD Symposium on Fluid Power [FPNI2016-1554] American Society of Mechanical Engineers. https://doi.org/10.1115/FPNI2016-1554
Johansen, Per ; Roemer, Daniel Beck ; Andersen, Torben O. ; Pedersen, Henrik Clemmensen. / Analysis of the Thermo-Viscous Effect on Friction and Energy Dissipation in Oil Lubricated Interfaces. Proceedings of the 9th FPNI PhD Symposium on Fluid Power. American Society of Mechanical Engineers, 2016.
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abstract = "The last decade an increasing amount of work are performed with the aim of enhancing efficiency and reliability of fluid power components. Consequently, the loss mechanisms of lubricated tribological interfaces are of particular interest. This has led to development of sophisticated three-dimensional thermo-elastohydrodynamic lubrication models of fluid power components. The computational efforts involved in simulation with such models entail that design optimization are to some extend impractical. However, such models are also pursued in theoretical tribology with the aim to study loss and wear mechanisms, which is very difficult to study experimentally. In consequence, advanced numerical models are the state of the art approach in theoretical fluid power tribology research. However, a downside of modern numerical models is the inability to provide a practical tool for wide-scale parameter sweep investigations, due to computational effort, whereby analytical research in loss mechanisms still have certain advantages. In this paper, the thermo-viscous effect of a lubricant is included in an analytical study of the friction and energy dissipation of oil hydraulic thin-films. This analytical study is based on an asymptotic approximation of the laminar lubrication thermal field at low reduced Peclet and Brinkman number, where viscosity is included as a function of temperature. The asymptotic series is truncated at first order and used to derive an expression of the viscous friction on a sliding surface. This reveal an influence from the surface temperature gradient on the viscous friction, which id not revealed when applying classical isothermal analysis. The significance of the thermo-viscous effect on friction and energy dissipation is analyzed analytically in order to provide a qualitative insight to the relation between thermo-dynamic properties, film thickness, sliding velocity, and viscous friction.",
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author = "Per Johansen and Roemer, {Daniel Beck} and Andersen, {Torben O.} and Pedersen, {Henrik Clemmensen}",
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Johansen, P, Roemer, DB, Andersen, TO & Pedersen, HC 2016, Analysis of the Thermo-Viscous Effect on Friction and Energy Dissipation in Oil Lubricated Interfaces. in Proceedings of the 9th FPNI PhD Symposium on Fluid Power., FPNI2016-1554, American Society of Mechanical Engineers, 9th FPNI Ph.D. Symposium on Fluid Power, Florianópolis, Brazil, 26/10/2016. https://doi.org/10.1115/FPNI2016-1554

Analysis of the Thermo-Viscous Effect on Friction and Energy Dissipation in Oil Lubricated Interfaces. / Johansen, Per; Roemer, Daniel Beck; Andersen, Torben O.; Pedersen, Henrik Clemmensen.

Proceedings of the 9th FPNI PhD Symposium on Fluid Power. American Society of Mechanical Engineers, 2016. FPNI2016-1554.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

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AU - Pedersen, Henrik Clemmensen

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N2 - The last decade an increasing amount of work are performed with the aim of enhancing efficiency and reliability of fluid power components. Consequently, the loss mechanisms of lubricated tribological interfaces are of particular interest. This has led to development of sophisticated three-dimensional thermo-elastohydrodynamic lubrication models of fluid power components. The computational efforts involved in simulation with such models entail that design optimization are to some extend impractical. However, such models are also pursued in theoretical tribology with the aim to study loss and wear mechanisms, which is very difficult to study experimentally. In consequence, advanced numerical models are the state of the art approach in theoretical fluid power tribology research. However, a downside of modern numerical models is the inability to provide a practical tool for wide-scale parameter sweep investigations, due to computational effort, whereby analytical research in loss mechanisms still have certain advantages. In this paper, the thermo-viscous effect of a lubricant is included in an analytical study of the friction and energy dissipation of oil hydraulic thin-films. This analytical study is based on an asymptotic approximation of the laminar lubrication thermal field at low reduced Peclet and Brinkman number, where viscosity is included as a function of temperature. The asymptotic series is truncated at first order and used to derive an expression of the viscous friction on a sliding surface. This reveal an influence from the surface temperature gradient on the viscous friction, which id not revealed when applying classical isothermal analysis. The significance of the thermo-viscous effect on friction and energy dissipation is analyzed analytically in order to provide a qualitative insight to the relation between thermo-dynamic properties, film thickness, sliding velocity, and viscous friction.

AB - The last decade an increasing amount of work are performed with the aim of enhancing efficiency and reliability of fluid power components. Consequently, the loss mechanisms of lubricated tribological interfaces are of particular interest. This has led to development of sophisticated three-dimensional thermo-elastohydrodynamic lubrication models of fluid power components. The computational efforts involved in simulation with such models entail that design optimization are to some extend impractical. However, such models are also pursued in theoretical tribology with the aim to study loss and wear mechanisms, which is very difficult to study experimentally. In consequence, advanced numerical models are the state of the art approach in theoretical fluid power tribology research. However, a downside of modern numerical models is the inability to provide a practical tool for wide-scale parameter sweep investigations, due to computational effort, whereby analytical research in loss mechanisms still have certain advantages. In this paper, the thermo-viscous effect of a lubricant is included in an analytical study of the friction and energy dissipation of oil hydraulic thin-films. This analytical study is based on an asymptotic approximation of the laminar lubrication thermal field at low reduced Peclet and Brinkman number, where viscosity is included as a function of temperature. The asymptotic series is truncated at first order and used to derive an expression of the viscous friction on a sliding surface. This reveal an influence from the surface temperature gradient on the viscous friction, which id not revealed when applying classical isothermal analysis. The significance of the thermo-viscous effect on friction and energy dissipation is analyzed analytically in order to provide a qualitative insight to the relation between thermo-dynamic properties, film thickness, sliding velocity, and viscous friction.

KW - Friction

KW - Energy dissipation

U2 - 10.1115/FPNI2016-1554

DO - 10.1115/FPNI2016-1554

M3 - Article in proceeding

SN - 978-0-7918-5047-3

BT - Proceedings of the 9th FPNI PhD Symposium on Fluid Power

PB - American Society of Mechanical Engineers

ER -

Johansen P, Roemer DB, Andersen TO, Pedersen HC. Analysis of the Thermo-Viscous Effect on Friction and Energy Dissipation in Oil Lubricated Interfaces. In Proceedings of the 9th FPNI PhD Symposium on Fluid Power. American Society of Mechanical Engineers. 2016. FPNI2016-1554 https://doi.org/10.1115/FPNI2016-1554