Consider a 55-cm-long journal bearing that is lubricated with oil whose viscosity is
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Fluid Mechanics: Fundamentals and Applications
- The 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_forwardA 50-cm x 30-cm x 20-cm block weighing 150 N is to be moved at a constant velocity of 0.8 m/s on 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 0.4-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 20 150 Narrow_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
- Step 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 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_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_forwardIn the design of small-scale bioprocess plant, a shear sensitive Newtonian liquid of density 1100 kg/m³, and viscosity 0.015 Nsm² is to be transported along a length of pipe at a rate of 4.3 litter per minute. Determine the diameter of the pipe required if the pressure drop along the pipe is not to exceed 100 Nm² per meter length.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_forward(b) An oil of viscosity is 5.11 x 10-4 m2/sec is used for lubricate the space between the shaft and sleeve. The diameter of the shaft is 0.5 m and rotates at 180 rpm. Determine the (i) Torque transmitted and (ii) power lost in the bearing for a sleeve length of 95 mm. The thickness of oil film between the shaft and sleeve is 2 mm. Take density of the oil as 880 kg/m³. Bearing Lubricant Shaftarrow_forward
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