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Thermal and inertia effects in externally pressurized conical thrust oil bearings
Authors:Essam Salem and Farid Khalil
Institution:(1) Dept. of Mech. Eng., Faculty of Eng., Alexandria Univ., Alexandria, Egypt
Abstract:This paper presents theoretical and experimental investigations of thermal and inertia effects on the performance of externally pressurized conical thrust bearings. The analysis, as well as the experimental results, revealed that the increase in oil temperature due to pad rotation has a detrimental effect on the load carrying capacity, while it increases the flow rate. Increasing the speed of rotation, will increase or decrease the bearing load carrying capacity depending on the recess dimensions.Nomenclature c lubricant specific heat - F frictional torque - h film thickness - L load carrying capacity - P pressure - Pprime pressure ratio (P/P 1) - P 1 inlet pressure - Q volume flow rate - r radius measured on cone surface - rprime radius ratio (R/R 3) - R 1 supply hole radius - R 2 recess radius - R 3 outside radius of bearing - S inertia parameter (0.15rgrOHgr 2 R 3 2 /P 1) - T temperature - u, v, w velocity components (see Fig. 2) - z coordinate normal to cone surface - rgr lubricant density - mgr lubricant viscosity - 2agr cone apex angle - OHgr rotational speed - delta recess depth
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