Consider a 55-cm-long journal bearing that is lubricated with oil whose viscosity is
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EBK FLUID MECHANICS: FUNDAMENTALS AND A
- A block weighing 150 N is at a 20° inclination from the ground. Its mass is 15.291 kg and has a dimension of 19.685" x 11.811" x 7.874". It is to be moved at a constant velocity of 0.80 m/s with a surface friction coefficient of 0.27. Determine the percent reduction of force if a film is applied on the surface versus to a surface with no film. The oil film is 0.40mm thick with an absolute viscosity of 0.012 kg/m-s. Express your answer in percentage form and in 2 decimal places. No need to put the percent sign.arrow_forwardThe figure below represents a cylinder C i (d = 11 cm) that is inside a hollow cylinder (d = 11.1 cm). The inner cylinder, with a mass of 30 kg and a length of 25 cm (L), is subjected to a pressure P of 50 kPa at its bottom, rising at a constant speed of 2.5 m/s. a) Determine the dynamic viscosity of the lubricating oil that must be placed in the space between the piston and the cylinder; b) Determine the kinematic viscosity knowing that it consists of a mixture of 3 L of oil A (specific mass of 880 kg/m 3 ) and 2200 mL of oil B (specific mass of 940 kg/m 3 ). Data: g = 9.81 m/s 2arrow_forwardThe clutch system shown in Fig is used to transmit torque through a 2-mm-thick oil film with ? = 0.38 N⋅s/m2 between two identical 30-cm-diameter disks. When the driving shaft rotates at a speed of 1200 rpm, the driven shaft is observed to rotate at 1125 rpm. Using appropriate software, investigate the effect of oil film thickness on the torque transmitted. Let the film thickness vary from 0.1 mm to 10 mm. Plot your results, and state your conclusions.arrow_forward
- A 50-cm x 30-cm x 20-cm block weighing W is to be moved at a constant velocity of 0.80 m/s on an inclined surface with a friction coefficient of 0.27. (a) Determine the force F that needs to be applied in the horizontal direction. (b) If a t-mm-thick oil film with a dynamic viscosity of 0.012 Pa-s is applied between the block and inclined surface, determine the percent reduction in the required force. V = 0.8 m/s 50 cm 30 cm F 20° W t (mm) W (N) 0.35 200arrow_forwardStep by Step Determine the distance that the column of fluid will rise in a 1-cm open tube when the tube is inserted in fluid with a density of 990 kg/m^3 and a surface tension of 0.09 N/m. Provide answer in cm and assume a contact angle of 0-degree.arrow_forwardA 400 mm diameter shaft is rotating at 200 rpm in a bearing of length 120 mm. If the thickness of oil film is 1.5 mm and the dynamic viscosity of the oil is 0.7 Ns/m2 determine: Power utilization in overcoming viscous resistancearrow_forward
- A capillary tube viscometer is being selected to measure viscosity of a liquid food. The maximum viscosity to be measured will be 230 cP and the maximum flow rate that can be measured accurately is 0.015 kg/min. If the tube length is 10cm and a maximum pressure of 25 Pa can be measured, determine the tube diameter to be used. The density of the product is 1000 kg/m3.arrow_forwardA pitot static tube is used to measure the velocity of air in a duct. The water manometer shows a reading of 8 cm. The static pressure in the duct is 9 kN/m2 and the air temperature is 320 K. The local barometer reads 740 mm of mercury. Calculate the air velocity if Cv = 0.98. Assume the gas constant for air as 287 J/kg K.arrow_forwardThe clutch system shown in the figure is used to transmit torque through a 2-mm-thick oil film with ? = 0.38 N⋅s/m2 between two identical 30-cm-diameter disks. When the driving shaft rotates at a speed of 1200 rpm, the driven shaft is observed to rotate at 1125 rpm. Assuming a linear velocity profile for the oil film, determine the transmitted torque.arrow_forward
- A pitot static tube is used to measure the velocity of air in a duct. The watermanometer shows a reading of 8 cm. The static pressure in the duct is 9 kN/m2and the air temperature is 320 K. The local barometer reads 740 mm of mercury.Calculate the air velocity if Cv = 0.98. Assume the gas constant for air as 287J/kg K.arrow_forwardThe clutch system shown in the figure is used to transmit torque through a 2 mm thick oil film with μ = 0.38 N.s/m2 between two identical 30 cm diameter disks. When the driving shaft rotates at a speed of 1450 rpm, the driven shaft is observed to rotate at 1398 rpm. Determine the transmitted torque.arrow_forwardA sphere, 1 m internal diameter and 6mm wall thickness, is to be pressure-tested for safety purposes with water as the pressure medium. Assuming that the sphere is initially filled with water at atmospheric pressure, what extra volume of water is required to be pumped in to produce a pressure of 3 MN/m2 gauge? For water, K = 2.1 GN/m2. For the material of the sphere E = 200 GN/m2, v = 0.3 and the yield stress 0, in simple tension = 280 MN/m2. a. 0.948 x 10-3 m3b. 0.648 x 10-3 m3c. 0.848 x 10-3 m3d. 0.748 x 10-3 m3arrow_forward
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