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Grease flow in an elbow channel
Westerberg, Lars; Farré Lladós, Josep; Li, Jinxia; Hoglund, Erik; Casals Terré, Jasmina
Universitat Politècnica de Catalunya. Escola Tècnica Superior d'Enginyeries Industrial i Aeronàutica de Terrassa (ETSEIAT); Universitat Politècnica de Catalunya. Departament d'Enginyeria Mecànica
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The flow of lubricating greases in an elbow channel has been modeled and validated with velocity profiles from flow visualizations using micro-particle image velocimetry. The elbow geometry induces a non-symmetric distribution of shear stress throughout its cross section, as well as varying shear rates through the transition from the elbow inlet to the outlet. The flow has been modeled both for higher flow rates and for creep flow. The influence of the grease rheology and flow conditions to wall slip, shear banding and an observed stick-slip type of motion observed for low flow rates are presented. The effect on the flow of the applied pressure is also modeled showing that the flow is sensitive to the pressure in the angular (phi) direction of the elbow. For high pressures, it is shown that the flow is reversed adjacent to the elbow walls.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids::Reologia
Lubrication and lubricants)
Grease flow
Wall slip
Shear banding
Stick-slip flow
Flow separation
Microparticle image velocimetry
Double restriction seal
Wall slip
Lubrificació i lubrificants

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