Calculating the dissipation in fluid dampers with non-newtonian fluid models |
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| Affiliation: | 1. Laboratory of Fluid Mechanics and Rheology, Department of Chemical Engineering, University of Patras, Patras 26500, Greece;2. Department of Mathematics and Statistics, University of Cyprus, PO Box 20537, Nicosia 1678, Cyprus;1. School of Civil Engineering, Dalian University of Technology, Dalian City, China;2. Durham School of Architectural Engineering & Construction, University of Nebraska–Lincoln, Lincoln, United States;3. DEUTZ (Dalian) Engine Company Limited, Dalian City, China |
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| Abstract: | 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. |
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| Keywords: | Oldroyd Dissipated power Polymeric liquid |
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