Abstract
Silicone fluids belong to the group of pseudoplastic non-Newtonian fluids with complex rheological characteristics. They are considered in basic and applied researches and in a wide range of industrial applications due to their favorable physical and thermal properties. One of their specific field of applications in the automotive industry is the working fluid of viscous torsional vibration dampers. For numerical studies in the design and development phase of this damping product, it is essential to have thorough rheological knowledge and mathematical description about the silicone oil viscosity. In the present work, adopted rheological measurement results conducted on polydimethylsiloxane manufactured by Wacker Chemie with initial viscosity of 1000 Pas (AK 1 000 000 STAB silicone oil) are processed. As a result of the parameter identification by nonlinear regression, the temperature-dependent parameter curves of the Carreau–Yasuda non-Newtonian viscosity model are generated. By implementing these parameter sets into a Computational Fluid Dynamics (CFD) software, a temperature- and shear-rate-dependent viscosity model of silicone fluid was tested, using transient flow and thermal simulations on elementary tube geometries in the size range of a real viscous torsional vibration damper’s flow channels and filling chambers. The numerical results of the finite volume method provide information about the developed flow processes, with especial care for the resulted flow pattern, shear rate, viscosity and timing.
Highlights
Polydimethylsiloxane (PDMS), or silicone oil, is a type of liquid polymerized siloxane (Si-O)whose molecules contain organic side chains
Chemie’s website [22], AK 1 000 000 STAB silicone oil is suggested to be used in these devices; the aim of the present paper is to develop a reliable, accurate, temperatureand shear-rate-dependent viscosity model of AK 1 000 000 STAB silicone oil for viscous torsional vibration damper applications
The application range of the silicone oils is increasing continuously; they are frequently used in energetics, vehicle engineering, astronautics and medical sciences
Summary
Polydimethylsiloxane (PDMS), or silicone oil, is a type of liquid polymerized siloxane (Si-O). Whose molecules contain organic side chains (for instance, CH3 methyl radicals). Its with regard to jurisdictional claims in chemical formula can be written as (H3 C)3 [Si(CH3 ) O]n Si(CH3 ) , where n is the number published maps and institutional affilProcesses 9, x FOR PEER REVIEW. 2 of of repeating monomer units, and the higher this number, the higher the viscosity of the iations.
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