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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- journal bearing 100 mm x 100 mm supports a shaft running at 1500 rpm. Radial clearance is 0.1 mm, minimum film thickness is 0.02 mm. Calculate the maximum radial load the bearing can support and for that load calculate the power lost in friction and oil temperature rise. Consider Absolute viscosity = 20e Pa.s. Specific gravity of oil = 0.88 and specific heat of oil = 2.1 kJ/kg K. Please provide step by step answer.A hydrodynamic journal bearing is subjected to 2000 N load at a rotational speed of 2000 rpm. Both bearing bore diameter and length are 40 mm. If radial clearance is 20 um and bearing is lubricated with an oil having viscosity 0.03 Pa.s, the Sommerfeld number of the bearing isA thin plate of very large area is placed in a gap of height h with oils of Еxample viscosities u' and u" on the two sides of the plate. The plate is pulled at a constant velocity V. Calculate the position of plate so that : The shear force on the two sides of the plate is equal (i) The force required to drag the plate is minimum. Assume viscous flow and neglect all end effects. SO Position of the plate, y: Thin plate
- 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.Anoilring bearing of transmission shaft of 50 mm diameter in which journal rotates at 1450 rpm, radial clearance and bearing pressure are 20 µ and 4 N/mm². If Sommerfeld number is 0.0637, the viscosity of lubricant isThe next 8 questions are all related to the following problem statement and figure. Air at 27°C with a free stream velocity of u» = 10 m/s is used to cool electronic devices mounted on a printed circuit board (PCB). Each device dissipates 40 mW (rate of conversion of electrical energy into thermal energy), is thin, and can be modeled as isothermal with a square top that is 5 mm by 5 mm. Due to the low thermal conductivity of the PCB, all of the dissipated energy can be assumed to be transferred out of the devices from their tops. A turbulence promoter (turbulator) is located at the leading edge of the board, causing the boundary layer to be turbulent over the entire length of the PCB. Estimate the surface temperature of the fourth device located 15 mm from the leading edge of the board. Use properties of air at T= 52°C and atmospheric pressure. Air Turbulator Fourth device X = 15 mm Printed circuit board Itt
- Q5: Determine the maximum safe speed of a journal hearing in r.p.m. The bearing dimension is 80 m long, it supports a load of 2.8 KN on a 50 mm diameter shaft. The bearing has a radial clearance of 0.05 mm and the viscosity of the oil is 0.021 kg/m-s at the operating temperature. The bearing can dissipate a 80 J/s.1. The viscous PDMS (Polydimethylsiloxane) coated on the glass (Sylagard 184, Dowcoaning) is using the spin coating material. If we fix the viscosity, density of coating material, initial thickness at 4000 cP, 965 kg/m3 and 0.105 cm, and then, the rotation time is fixed at time of 300s and the rotation of device start from 500 to 6000 RPM. Calculate the final thickness of the film at angular speed from 500-6000rpm (step by 500rpm) and draw the relationship between the final thickness (h) and angular speed (@).Q1/ consider a (0.8m) high and (1.5m) wide double pane widow consisting of two (4mm) thick layers of glass (k=0.78W/m.°C) separated by a (10mm) wide stagnant air space (k=0.026W/m.C). ). Take the (hi) on the inner surface = 10W/m2.°C and (ho) on the outer surface = 40W/ m².°C. Determine The steady rate of heat transfer through this double pane window is equal The temperature of its inner surface for a day during which the room is maintained at (293K) while the temperature of the outdoor is (263K) is equal to *
- Consider the cylinder shown in the figure. We know that the cylinder is moving a load at 12 m/min as it extends to the right. We also know that Ap = 10 cm2 , Ar = 7.5 cm2, the clearance of the spool is c = 5 µm, and the length of %3D %3! the spool is L = 10 mm. The fluid has a density p = 0.9 g/ml, and a viscosity of u = 0.15 Ns/m2. Assuming P2 is negligible and that the load has a stiction force of 1000 N to overcome, find (a) pressure P1, (b) flow Q1 and (c) the efficiency of the cylinder. F A, A, Piston area Pal Q, Rod-side area5. A 50 mm diameter shaft rotates in a sleeve of 50.3 mm internal diameter and length 100 mm. In the annulus space, a lubricating oil of viscosity u = 0.11 Pa-s is filled. Calculate the rate of heat generation when the shaft rotates at 200 rpm. 6. A glass capillary tube of diameter 0.3 mm and length 60 mm is dipped in a water having surface tension 0.017 N/m. The contact angle between the liquid and the tube wall is 40°. Will the water overflow through the tube? If not, comment on the nature and radius of meniscus. 7. Determine the absolute pressure of air flowing in a circular duct using an inclined tube manometer, as shown in Fig. 2.49. The barometer reading is 740 mm Hg. Air 150 mm 200 mím Water 30° Fig. 2.49Please answer:Engine oil at 100 C flows over and parallel to a flat surface at a velocity of 3 m/s. Calculate the Reynolds number at a distance of 0.3m from the edge of the surface.Engine oil kinematic viscosity at 100C = 20.3x10 m /s.