V 14: How do principles of viscosity impact the performance of lubrication systems in mechanical machinery?
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In the context of lubrication systems, it refers to the oil's ability to resist shear or flow under stress. This property is crucial as it affects the oil's ability to form a protective film between moving parts. Show more…
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Q1: Calculate the dynamic viscosity of an oil which is used for lubrication between a square plate of size 80 cm x 80 cm and an inclined plane (see figure). The weight of the square plate is 300 N, and it slides down the inclined plane with a uniform velocity of 0.3 m/sec. The thickness of the oil film is 0.5 mm. Q2: Two horizontal plates are placed 1.25 cm apart, with the space between them being filled with oil of viscosity 14 poises. Calculate the shear stress in the oil if the upper plate is moved with a velocity of 2.5 m/sec. Q3: The space between two square flat parallel plates is filled with oil. Each side of the plate is 60 cm. The thickness of the oil film is 12.5 mm. The upper plate, which moves at 2.5 m/sec, requires a force of 98.1 N to maintain the speed. Determine the dynamic viscosity of the oil and the kinematic viscosity of the oil if the specific gravity of the oil is 0.95. Q4: Find the kinematic viscosity of an oil having a density of 981 kg/m^3. The shear stress at a point in the oil is 0.2542 N/m^2, and the velocity gradient at that point is 0.2 per second.
Adi S.
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(1) Medium lubricating oil, spgr 0.860, is pumped through 300 m of horizontal 50. J0-min pipe at the rate of 0.00140 m/s. If the drop in pressure is 200 kPa, what is the coefficient of viscosity of the oil? (2) A wide moving belt passes through a container of a viscous liquid. The belt moves vertically upward with a constant velocity, Vo, as illustrated in Fig: [. Because of viscous forces, the belt picks up a film of fluid of thickness h. Gravity tends to make the fluid drain down on the belt. Determine an expression for the average velocity of the fluid film as it is dragged up the belt. Assume that the flow is laminar, steady, and uniform.
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