Calculating the dissipation in fluid dampers with non-newtonian fluid models

• We used non-newtonian fluids to model damper fluids.
• The viscous dissipation is calculated using only the irreversible part of the fluid.
• The dissipation is significantly lower compared to a newtonian fluid.
• Any non-newtonian fluid can be used for this formula to calculate the dissipation in them.

The present paper gives a comparison of the Maxwell, Upperconvected Maxwell and the Oldroyd-B model for the calculation of dissipation in high shear-rate cases. Usage of viscodampers in the automotive industry is the most common. There is a good scope of the computing this power in the case of Newtonian fluids. When a polymeric liquid is considered that part of energy that is irreversible cannot be calculated as Pdiss. = τ : d. For fluids where the separation into a solvent and a polymer part is not available but the deformation gradient tensor must be separated into two parts. One part consists of only the elastic deformation while the other is the non-elastic. This paper shows this separation using the Maxwell and the UCM models. A simple problem is shown, solving both analytically and numerically. The steady state temperature distribution of a damper then is validated with measurement.