FOX+MCDONALD'S INTRO.TO...-ACCESS+BOX
9th Edition
ISBN: 9781118471340
Author: Pritchard
Publisher: WILEY
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Chapter 2, Problem 60P
A shock-free coupling for a low-power
P2.60
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H.W:A piece of the pipe 300 mm long weighing 13 N and having i.d of 51mm is slipped over a vertical shaft 50 mm in diameter and allowed to fall .calculate the approximate velocity attained by the pipe if a film of oil of viscosity 25 pa.s is maintained between pipe and shaft .
A fluid with a velocity of 30 m/s flows past a sphere with a radius of 40 mm. The density and viscosity of the fluid is1.32 kg/m3 and 3.6 x 10-5Pa.s, respectively. Calculate the force exerted on the sphere? (CD = 0.31)
The rotating parts of a hydroelectric power plant having power capacity W . have a rotational synchronous speed n .. The weight of the rotating parts (the hydroturbine and its electric generator) is supported in a thrust bearing having annular form between D and d diameters as sketched. The thrust bearing is operated with a very thin oil film of thickness e and dynamic viscosity ? . It is assumed that the oil is a Newtonian fluid and the velocity is approximated as linear in the bearing. Calculate the ratio of lost power in the thrust bearing to the produced power in the hydraulic power plant. Use W . = 48.6 MW, ? = 0.035 Pa⋅s, n . = 500 rpm, e = 0.25 mm, D = 3.2 m, and d = 2.4 m.
Chapter 2 Solutions
FOX+MCDONALD'S INTRO.TO...-ACCESS+BOX
Ch. 2 - For the velocity fields given below, determine:...Ch. 2 - For the velocity fields given below, determine:...Ch. 2 - A viscous liquid is sheared between two parallel...Ch. 2 - For the velocity field V=Ax2yi+Bxy2j, where A = 2...Ch. 2 - A fluid flow has the following velocity...Ch. 2 - When an incompressible, nonviscous fluid flows...Ch. 2 - For the free vortex flow the velocities are t =...Ch. 2 - For the forced vortex flow the velocities are t =...Ch. 2 - A velocity field is specified as V=axyi+by2j,...Ch. 2 - A velocity field is given by V=ax3i+bxy3j, where a...
Ch. 2 - The velocity for a steady, incompressible flow in...Ch. 2 - The flow field for an atmospheric flow is given by...Ch. 2 - For the velocity field V=AxiAyj,, where A = 2s 1....Ch. 2 - A velocity field in polar coordinates is given...Ch. 2 - The flow of air near the Earths surface is...Ch. 2 - A velocity field is given by V=aytibxj, where a =...Ch. 2 - Air flows downward toward an infinitely wide...Ch. 2 - Consider the flow described by the velocity field...Ch. 2 - Consider the velocity field V = axi + by(1 + ct)...Ch. 2 - Consider the flow field given in Eulerian...Ch. 2 - A velocity field is given by V=axti+byj, where A =...Ch. 2 - Consider the garden hose of Fig. 2.5. Suppose the...Ch. 2 - Consider the velocity field of Problem 2.18. Plot...Ch. 2 - Streaklines are traced out by neutrally buoyant...Ch. 2 - Consider the flow field V=axti+bj, where a = 1/s2...Ch. 2 - A flow is described by velocity field V=ay2i+bj,...Ch. 2 - Tiny hydrogen bubbles are being used as tracers to...Ch. 2 - A flow is described by velocity field V=ai+bxj,...Ch. 2 - A flow is described by velocity field V=ayi+btj,...Ch. 2 - A flow is described by velocity field V=ati+bj,...Ch. 2 - The variation with temperature of the viscosity of...Ch. 2 - The variation with temperature of the viscosity of...Ch. 2 - Some experimental data for the viscosity of helium...Ch. 2 - The velocity distribution for laminar flow between...Ch. 2 - What is the ratio between the viscosities of air...Ch. 2 - Calculate velocity gradients and shear stress for...Ch. 2 - A very large thin plate is centered in a gap of...Ch. 2 - A female freestyle ice skater, weighing 100 lbf,...Ch. 2 - A block of mass 10 kg and measuring 250 mm on each...Ch. 2 - A 73-mm-diameter aluminum (SG = 2.64) piston of...Ch. 2 - A vertical gap 25 mm wide of infinite extent...Ch. 2 - A cylinder 8 in. in diameter and 3 ft long is...Ch. 2 - Crude oil at 20C fills the space between two...Ch. 2 - The piston in Problem 2.40 is traveling at...Ch. 2 - A block of mass M slides on a thin film of oil....Ch. 2 - A block 0.1 m square, with 5 kg mass, slides down...Ch. 2 - A torque of 4 N m is required to rotate the...Ch. 2 - A circular disk of diameter d is slowly rotated in...Ch. 2 - The fluid drive shown transmits a torque T for...Ch. 2 - A block that is a mm square slides across a flat...Ch. 2 - In a food-processing plant, honey is pumped...Ch. 2 - SAE 10W-30 oil at 100C is pumped through a tube L...Ch. 2 - The lubricant has a kinematic viscosity of 2:8105...Ch. 2 - Calculate the approximate viscosity of the oil....Ch. 2 - Calculate the approximate power lost in friction...Ch. 2 - Fluids of viscosities 1 = 0.1 Ns/m2 and 2 = 0.15...Ch. 2 - A concentric cylinder viscometer may be formed by...Ch. 2 - A concentric cylinder viscometer is driven by a...Ch. 2 - A shaft with outside diameter of 18 mm turns at 20...Ch. 2 - A shock-free coupling for a low-power mechanical...Ch. 2 - A proposal has been made to use a pair of parallel...Ch. 2 - The cone and plate viscometer shown is an...Ch. 2 - A viscometer is used to measure the viscosity of a...Ch. 2 - A concentric-cylinder viscometer is shown. Viscous...Ch. 2 - Design a concentric-cylinder viscometer to measure...Ch. 2 - A cross section of a rotating bearing is shown....Ch. 2 - Small gas bubbles form in soda when a bottle or...Ch. 2 - You intend to gently place several steel needles...Ch. 2 - According to Folsom [6], the capillary rise h...Ch. 2 - Calculate and plot the maximum capillary rise of...Ch. 2 - Calculate the maximum capillary rise of water...Ch. 2 - Calculate the maximum capillary depression of...Ch. 2 - Water usually is assumed to be incompressible when...Ch. 2 - The viscous boundary layer velocity profile shown...Ch. 2 - In a food industry process, carbon tetrachloride...Ch. 2 - What is the Reynolds number of water at 20C...Ch. 2 - A supersonic aircraft travels at 2700 km/hr at an...Ch. 2 - SAE 30 oil at 100C flows through a 12-mm-diameter...Ch. 2 - A seaplane is flying at 100 mph through air at...Ch. 2 - An airliner is cruising at an altitude of 5.5 km...
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- A shaft 70-mm in diameter is being pushed at a speed of 400mm/s through a bearing sleeve 70.2-mm in diameter and 250mm long. The clearance is filled with oil with a kinematic viscosity of v = 0.005 m²/s and SG-0.9. A. Find the frictional resistance exerted by the oil on the shaft in Newtons (N). B. If the shaft in the problem above is fixed axially and rotated inside the sleeve at 2000 rpm, determine the resisting torque exerted by the oil and the power required to rotate the shaft in kilowatts (kW).arrow_forwardMethane gas is being pumped through a 305-m length of 52.5-mm-ID steel pipe at the rate of 41.0 kg/m2• s. The inlet pressure is P1 = 345 kPa abs. Assume isothermal flow at 288.8 K.a. Calculate the pressure P2 at the end of the pipe. The viscosity is 1.04 x 10 5 Pa·s.b. Calculate the maximum velocity that can be attained at these conditions and compare with the velocity in part (a).arrow_forwardBy means of a torque T, a disk 1 is rotated with an angular velocity w1. In the gap "between the two disks shown there is an oil of viscosity. If disk 2 rotates freely under the action of disk 1 and both disks have a diameter D. Determine the expression for rotation w of disk 2, neglecting external effects.arrow_forward
- Q6) The space between two parallel plates is filled with oil. Each side of the plate is 60 cm. the thickness of oil film is 12.5 mm. The upper plate, which moves at 2.5 metre per sec requires a force of 98.1 N to maintain the Speed. Determinearrow_forwardA shaft 70-mm in diameter is being pushed at a speed of 400mm/s through a bearing sleeve 70.2-mm in diameter and 250mm long. The clearance is filled with oil with a kinematic viscosity of v = 0.005 ?2/? and SG=0.9. Find the frictional resistance exerted by the oil on the shaft in Newtons (N). And when the shaft is fixed axially and rotated inside the sleeve at 2000 rpm, determine the resisting torque exerted by the oil and the power required to rotate the shaft in kiloWatts (kW).arrow_forwardA shaft 70-mm in diameter is being pushed at a speed of 400mm/s through a bearing sleeve 70.2-mm in diameter and 250mm long. The clearance is filled with oil with a kinematic viscosity of v = 0.005 ?2/? and SG=0.9. Find the frictional resistance exerted by the oil on the shaft in Newtons (N).arrow_forward
- A piston has a 6 "diameter where a 6.008" bore riser slides. The piston is 6 In.long and weighs 2.2 Ib. Determine the terminal velocity of the piston if it is lubricated with oil with a viscosity of 0.020 Ib-s / ft2.arrow_forward13.14 What is the minimum surface tension of a fluid that can sustain a gauge pressure of 0.1 kPa in a 0.5 cm radius bubble?arrow_forwardA fluid of density ? and viscosity ? flows through a section of horizontal converging–diverging duct. The duct cross-sectional areas Ainlet, Athroat, and Aoutlet are known at the inlet, throat (minimum area), and outlet, respectively. Average pressure Poutlet is measured at the outlet, and average velocity Vinlet is measured at the inlet. (a) Neglecting any irreversibility such as friction, generate expressions for the average velocity and average pressure at the inlet and the throat in terms of the given variables. (b) In a real flow (with irreversibility), do you expect the actual pressure at the inlet to be higher or lower than the prediction? Explain.arrow_forward
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