Viscous dissipation impact on pressure loss in compressible lubricants

Abstract eng:
In the present work we consider compressible viscous lubrication oils in a channel flow. With the aim to study the effects of viscous dissipation and thermodynamics in a very thin lubricant film. Direct numerical simulations of the compressible Navier-Stokes equations and the energy equation are performed for a lubricant oil whose equation of state is represented by a stiffened gas model. Particular attention is paid to the resulting pressure losses in the plane channel. It is shown that these viscous effects, that alter the classical Couette velocity profile towards a Couett-Poiseuille one, scale with the parameter α = µLU/h2 , and that the losses are proportional to the square of α.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket