Elasto-hydrodynamic lubrication of ball bearings and drops

Pasquale Dell'Aversana, Marcello Lappa, Paul Neitzel

Research output: Contribution to conferenceAbstract

Abstract

It has been recently pointed out that liquids can be lubricated similarly to solids through the imposition of relative surface motion, e.g., using thermocapillarity or forced convection. Here we examine some aspects of drop lubrication that exhibit astonishing similarities, but also differences, with conventional ball bearings that undergo elasto-hydrodynamic lubrication. Despite the fact that a drop, considered as a bearing, is able to carry a very small load compared with a normal ball bearing, the lubrication channels in the two cases have similar characteristics. On the other hand, a drop can only work in fully hydrodynamic regime, because boundary lubrication and what tribologists call starvation of lubricant lead to the immediate rupture of the drop and loss of the lubricating film. The idea underlying our discussion is that there is much to learn from drop lubrication because, as long as the drops remain intact, they behave somehow like ideal bearings. Numerical simulations based upon experimental data compare the performances of naturally shaped lubrication channels with those of channels that have been machined with some basic profiles.

Other

OtherAmerican Physical Society, Division of Fluid Dymanics 55th Annual Meeting, 2002
CountryUnited States
Period1/11/021/11/02

Fingerprint

ball bearings
lubrication
hydrodynamics
boundary lubrication
forced convection
lubricants
convection
liquids
profiles

Keywords

  • relative surface motion
  • elasto-hydrodynamic lubrication
  • numerical simulations
  • forced convection

Cite this

Dell'Aversana, P., Lappa, M., & Neitzel, P. (2002). Elasto-hydrodynamic lubrication of ball bearings and drops. Abstract from American Physical Society, Division of Fluid Dymanics 55th Annual Meeting, 2002, United States.
Dell'Aversana, Pasquale ; Lappa, Marcello ; Neitzel, Paul. / Elasto-hydrodynamic lubrication of ball bearings and drops. Abstract from American Physical Society, Division of Fluid Dymanics 55th Annual Meeting, 2002, United States.1 p.
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abstract = "It has been recently pointed out that liquids can be lubricated similarly to solids through the imposition of relative surface motion, e.g., using thermocapillarity or forced convection. Here we examine some aspects of drop lubrication that exhibit astonishing similarities, but also differences, with conventional ball bearings that undergo elasto-hydrodynamic lubrication. Despite the fact that a drop, considered as a bearing, is able to carry a very small load compared with a normal ball bearing, the lubrication channels in the two cases have similar characteristics. On the other hand, a drop can only work in fully hydrodynamic regime, because boundary lubrication and what tribologists call starvation of lubricant lead to the immediate rupture of the drop and loss of the lubricating film. The idea underlying our discussion is that there is much to learn from drop lubrication because, as long as the drops remain intact, they behave somehow like ideal bearings. Numerical simulations based upon experimental data compare the performances of naturally shaped lubrication channels with those of channels that have been machined with some basic profiles.",
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Dell'Aversana, P, Lappa, M & Neitzel, P 2002, 'Elasto-hydrodynamic lubrication of ball bearings and drops' American Physical Society, Division of Fluid Dymanics 55th Annual Meeting, 2002, United States, 1/11/02 - 1/11/02, .

Elasto-hydrodynamic lubrication of ball bearings and drops. / Dell'Aversana, Pasquale; Lappa, Marcello; Neitzel, Paul.

2002. Abstract from American Physical Society, Division of Fluid Dymanics 55th Annual Meeting, 2002, United States.

Research output: Contribution to conferenceAbstract

TY - CONF

T1 - Elasto-hydrodynamic lubrication of ball bearings and drops

AU - Dell'Aversana, Pasquale

AU - Lappa, Marcello

AU - Neitzel, Paul

PY - 2002/11/24

Y1 - 2002/11/24

N2 - It has been recently pointed out that liquids can be lubricated similarly to solids through the imposition of relative surface motion, e.g., using thermocapillarity or forced convection. Here we examine some aspects of drop lubrication that exhibit astonishing similarities, but also differences, with conventional ball bearings that undergo elasto-hydrodynamic lubrication. Despite the fact that a drop, considered as a bearing, is able to carry a very small load compared with a normal ball bearing, the lubrication channels in the two cases have similar characteristics. On the other hand, a drop can only work in fully hydrodynamic regime, because boundary lubrication and what tribologists call starvation of lubricant lead to the immediate rupture of the drop and loss of the lubricating film. The idea underlying our discussion is that there is much to learn from drop lubrication because, as long as the drops remain intact, they behave somehow like ideal bearings. Numerical simulations based upon experimental data compare the performances of naturally shaped lubrication channels with those of channels that have been machined with some basic profiles.

AB - It has been recently pointed out that liquids can be lubricated similarly to solids through the imposition of relative surface motion, e.g., using thermocapillarity or forced convection. Here we examine some aspects of drop lubrication that exhibit astonishing similarities, but also differences, with conventional ball bearings that undergo elasto-hydrodynamic lubrication. Despite the fact that a drop, considered as a bearing, is able to carry a very small load compared with a normal ball bearing, the lubrication channels in the two cases have similar characteristics. On the other hand, a drop can only work in fully hydrodynamic regime, because boundary lubrication and what tribologists call starvation of lubricant lead to the immediate rupture of the drop and loss of the lubricating film. The idea underlying our discussion is that there is much to learn from drop lubrication because, as long as the drops remain intact, they behave somehow like ideal bearings. Numerical simulations based upon experimental data compare the performances of naturally shaped lubrication channels with those of channels that have been machined with some basic profiles.

KW - relative surface motion

KW - elasto-hydrodynamic lubrication

KW - numerical simulations

KW - forced convection

M3 - Abstract

ER -

Dell'Aversana P, Lappa M, Neitzel P. Elasto-hydrodynamic lubrication of ball bearings and drops. 2002. Abstract from American Physical Society, Division of Fluid Dymanics 55th Annual Meeting, 2002, United States.