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Lubricating grease flow in a double restriction seal geometry: a computational fluid dynamics approach
Westerberg, Lars G.; Sarkar, Chiranjit; Farré Lladós, Josep; Staffan Lundström, T.; Hoglund, Erik
Universitat Politècnica de Catalunya. Departament d'Enginyeria Mecànica
In this paper, numerical simulations of lubricating grease flow in the grease pocket of a double restriction seal geometry using computational fluid dynamics are presented. The grease is treated as a single-phase Herschel–Bulkley fluid with different rheological properties corresponding to NLGI grade 00, 1 and 2. The numerical code and rheology model have been validated with a semi-analytical solution based on flow measurements using microparticle image velocimetry. The flow has been modelled for low and high rotational speeds driving the flow, and elevated temperatures. Also, the evolution of contaminant particles in the grease pocket is investigated. It was found that the flow and velocity distribution in the pocket—and consequently the contaminant particle concentration evolution, is characterized by the shear thinning rheology of the grease. With higher shear rates in the grease and higher temperatures, the grease approaches a more Newtonian type of behaviour leading to a reduced yield and shear thinning characteristics directly affecting the grease ability to transport contaminant particles.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids
Computational fluid dynamics
Lubrication and lubricants
Lubricating grease flow
Velocity profiles
Computational fluid dynamics (CFD)
Double restriction seal
Dinàmica de fluids computacional
Lubrificació i lubrificants

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