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Elastohydrodynamic lubricant flow with nanoparticle tracking.

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Summary
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High pressure changes lubricant flow in elastohydrodynamic (EHD) contacts. Nanoparticle tracers show polybutene (PB) shifts from Couette to partial plug flow, revealing complex rheological behavior under pressure.

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Area of Science:

  • Tribology
  • Materials Science
  • Fluid Dynamics

Background:

  • Lubricants in elastohydrodynamic (EHD) contacts experience rheological changes under high pressure.
  • Previous studies relied on limited techniques to observe these pressure-induced flow variations.

Purpose of the Study:

  • To investigate the effect of pressure on the rheological properties and flow behavior of polybutene (PB) lubricants within an EHD contact.
  • To provide direct evidence of lubricant flow modifications under varying contact pressures.

Main Methods:

  • Incorporation of nanoparticles (NPs) into polybutene (PB) to serve as flow tracers.
  • Utilizing luminescence-based imaging velocimetry to track NP movement and measure lubricant velocity profiles (U(z)).
  • Analyzing particle velocity distributions (f(U)) under different contact pressures.

Main Results:

  • Particle velocity distributions (f(U)) were found to be dependent on contact pressure.
  • A quantitative correlation was established between f(U) and the through-thickness velocity profiles U(z).
  • Polybutene (PB) flow was confirmed to transition from Couette flow to partial plug flow above a critical pressure.

Conclusions:

  • The study confirms that lubricant rheology in high-pressure EHD contacts is complex and pressure-sensitive.
  • Nanoparticle tracer velocimetry is an effective method for observing lubricant flow dynamics under EHD conditions.
  • The observed shift in flow behavior highlights the importance of considering non-Newtonian fluid mechanics in EHD lubrication.