what should be the viscosity of oil to limit the bearing surface temperature to 60°C?
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A 100 mm long and 60 mm diameter journal bearing supports a load of 2500 N at 600 r.p.m. If the room
temperature is 20°C, what should be the viscosity of oil to limit the bearing surface temperature to 60°C?
The diametral clearance is 0.06 mm and the energy dissipation coefficient is based on the projected area of
bearing is 210 W/m2/°C.
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- A 100 mm long and 60 mm diameter journal bearing supports a load of 2500 N at 600 r.p.m. If the room temperature is 20°C, what should be the viscosity of oil to limit the bearing surface temperature to 60°C? The diametral clearance is 0.06 mm and the energy dissipation coefficient based on projected area of bearing is 210 W/m²/°C.two parallel plates,one moving at 4m/s and the other are fixed, are separated by a 5 mm thick layer of oil of specific gravity of 0.8 and kinematic viscosity 1.25 *10^-4 m^2/s.what is the average shear stress in oil?An aluminium canoe moves horizontally along the surfaceof a lake at 8.0 mi/h.The temperature of the lake water is50°F. The bottom of the canoe is 18 ft long and is flat. Is theboundary layer on the canoe bottom laminar or turbulent?. Thekinematic viscosity of Water at 50°F is 1.516 *10-5ft2/s.
- A 0.5m x 2m flat thin plate is moved at 5m/s on a 2-mm thick layer of SAE 30 oil at 38 degrees Celsius that separates it from a flat surface. The velocity distribution between the plate and the surface is assumed to be linear. What force is required if the plate and surface are horizontal? (μSAE30 = 0.1 N-s/m2)A minivan is pulled by a tow truck at 60 kph. The boxlike van is 20m long, 6m high, and 3.75m wide. Estimate the skin friction, Df, on the van's top and sides. Take the density and viscosity of air as 0.0023 kg/m3 and 0.3758x10-6 N-s/m2.A 0.75 m by3m flat plate is towed at 5 m/s on a 2.5-mm-thick layer of SAE-30 oil at 38°C, with absolute viscocity of 100 cP,that separates it from a flat surface. The velocity distribution between the plate and the surface is assumed to be linear. What force is required if the plate and surface are horizontal?
- A shaft 70.0 mm in diameter is being pushed at a speed of 400 mm/s through a bearing sleeve 70.2 mm in diameter and 250 mm long. The clearance, assumed uniform, is filled with oil at 20 deg C with kinematic viscosity of 0.005 m^2/s and specific gravity 0.9. If the shaft is fixed axially and rotated inside the sleeve at 2000 rpm, determine the power required to rotate the shaft.A 20 °C water flows to 50cmx60cm flat plate with velocity of 6m/s . The flat plate surface temperature is maintained at 40 °C . The air flows parallel to the 50cm side of the plate. If the kinematic viscosity of water is 78x10-8 m2/s, at what length the flow become turbulent? If the average laminar heat transfer coefficient of water is 7740W/m2 °C , what is the overall heat transfer at the laminar section?A fluid with a constant density of 961 kg/m3 and a constant viscosity of 1.419×10-3 Kg/m.s is flowing over a flat plate at a stream free velocity of 0.87 m/s. If the plate has a length of 2 m, answer the following: 1.What is Reynolds number at a point that is (1/4)L down the entrance? 2.Is the flow laminar or turbulent? 3.Calculate the thickness of the boundary layer in mm at (1/4)L down the entrance 4.Calculate the drag coefficient at (1/4)L down the entrance
- What will be the terminal velocities of mica plates, 1 mm thick and ranging in area from 6 mm² to 600 mm² settling in an oil of density 820 kg/m³ and viscosity 10 mN-s/m² ? The density of mica is 3000 kg/m³.Calculate the pressure drop of starfruit juice drink that flows with a velocity of 1.5 m/sthrough 1.2 m of horizontal sanitary stainless steel tubing with 9 mm inner diameter. Thedensity and viscosity of starfruit juice drink are 2300 kg m -3 and 0.8 x 10 -3 kg m -1 s -1 ,respectively. Calculate the energy losses due to the friction. Use the Moody diagram tosolve this problem.A solid sphere having diameter 5 mm is falling through oil of density 800 kg/m? and dynamic viscosity 0.8 kg/m-s at a constant velocity of 1 cm/s. Drag force on the sphere