Codrignani, A.A.CodrignaniSavio, D.D.SavioMagagnato, F.F.MagagnatoFrohnapfel, B.B.Frohnapfel2022-03-052022-03-052017https://publica.fraunhofer.de/handle/publica/24767210.1016/j.triboint.2016.12.007The shearing of compressible fluids in a channel with parallel walls is studied to understand the impact of viscous dissipation and thermodynamics in thin lubricant films. Numerical simulations based on the compressible Navier-Stokes equations and Reynolds equation, both coupled with the energy equation, are performed for a lubricant oil. Particular attention is paid to the resulting pressure losses in the plane channel. It is shown that viscous effects, that alter the classical Couette velocity profile towards a Couette-Poiseuille one, scale with the parameter x=m0Ul/(h2Pref)x=m0Ul/(h2Pref), and that the pressure losses are proportional to the square of x.en621journal article