Fox and McDonald's Introduction to Fluid Mechanics
9th Edition
ISBN: 9781118912652
Author: Philip J. Pritchard, John W. Mitchell
Publisher: WILEY
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 9, Problem 73P
Assuming a critical Reynolds number of 0.1, calculate the approximate diameter of the largest air bubble that will obey Stokes’ law while rising through a large tank of oil of viscosity 0.19 Pa s and SG 0.90.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
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.
A steel tape 0.5 mm thick and 20 mm wide is pulled by a force ? through a slit opening 1.5 mm and length 15 mm. Considering that the tape is centered on the slit, that lubricating oil of viscosity µ = 0.4 ??-2? fills the gap spaces not occupied by the tape and that the maximum tape speed is 10 m/s, calculate the maximum force ? .
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 is
Chapter 9 Solutions
Fox and McDonald's Introduction to Fluid Mechanics
Ch. 9 - The roof of a minivan is approximated as a...Ch. 9 - A model of a river towboat is to be tested at 1:18...Ch. 9 - For flow over a smooth plate, what approximately...Ch. 9 - A model of a thin streamlined body is placed in a...Ch. 9 - A student is to design an experiment involving...Ch. 9 - A 1 m 2 m sheet of plywood is attached to the...Ch. 9 - The extent of the laminar boundary layer on the...Ch. 9 - Velocity profiles in laminar boundary layers often...Ch. 9 - An approximation for the velocity profile in a...Ch. 9 - Evaluate / for each of the laminar boundary-layer...
Ch. 9 - Evaluate the displacement thickness and the...Ch. 9 - Evaluate the displacement thickness and the...Ch. 9 - A fluid, with density = 1.5 slug/ft3, flows at U...Ch. 9 - Solve Problem 9.13 with the velocity profile at...Ch. 9 - Air flows in a horizontal cylindrical duct of...Ch. 9 - Evaluate the displacement thickness and the...Ch. 9 - Evaluate the displacement thickness and the...Ch. 9 - A laboratory wind tunnel has a test section 25 cm...Ch. 9 - Air flows in the entrance region of a square duct,...Ch. 9 - A flow of 68F air develops in a flat horizontal...Ch. 9 - A flow of air develops in a horizontal cylindrical...Ch. 9 - Using numerical results for the Blasius exact...Ch. 9 - Using numerical results obtained by Blasius (Table...Ch. 9 - Using numerical results obtained by Blasius (Table...Ch. 9 - A smooth flat plate 2.4 m long and 0.6 m wide is...Ch. 9 - Consider flow of air over a flat plate. On one...Ch. 9 - A thin flat plate, L = 9 in. long and b = 3 ft...Ch. 9 - For a laminar boundary layer on a flat plate,...Ch. 9 - Air at atmospheric pressure and 20C flows over...Ch. 9 - A thin flat plate is installed in a water tunnel...Ch. 9 - Assume laminar boundary-layer flow to estimate the...Ch. 9 - Assume laminar boundary-layer flow to estimate the...Ch. 9 - Assume laminar boundary-layer flow to estimate the...Ch. 9 - Prob. 34PCh. 9 - Water at 10C flows over a flat plate at a speed of...Ch. 9 - Use the momentum integral equation to derive...Ch. 9 - A smooth flat plate 1.6 ft long is immersed in 68F...Ch. 9 - Prob. 38PCh. 9 - A developing boundary layer of standard air on a...Ch. 9 - Assume the flow conditions given in Example 9.3....Ch. 9 - A flat-bottomed barge having a 150 ft 20 ft...Ch. 9 - European InterCity Express trains operate at...Ch. 9 - Grumman Corp. has proposed to build a magnetic...Ch. 9 - Repeat Problem 9.32, for an air flow at 80 ft/s,...Ch. 9 - The velocity profile in a turbulent boundary-layer...Ch. 9 - The U.S. Navy has built the Sea Shadow, which is a...Ch. 9 - The two rectangular smooth flat plates are to have...Ch. 9 - Standard air flows over a horizontal smooth flat...Ch. 9 - Air at standard conditions flows over a flat...Ch. 9 - A uniform flow of standard air at 60 m/s enters a...Ch. 9 - A laboratory wind tunnel has a flexible upper wall...Ch. 9 - Air flows in a cylindrical duct of diameter D = 6...Ch. 9 - Perform a cost-effectiveness analysis on a typical...Ch. 9 - Table 9.1 (on the web) shows the numerical results...Ch. 9 - A fluid flow enters the plane-wall diffuser that...Ch. 9 - For flow over a flat plate with zero pressure...Ch. 9 - A flat-bottomed barge, 80 ft long and 35 ft wide,...Ch. 9 - A towboat for river barges is tested in a towing...Ch. 9 - Plot the local friction coefficient cf, the...Ch. 9 - A smooth plate 3 m long and 0.9 m wide moves...Ch. 9 - Resistance of a barge is to be determined from...Ch. 9 - A nuclear submarine cruises fully submerged at 27...Ch. 9 - You are asked by your college crew to estimate the...Ch. 9 - The drag coefficient of a circular disk when...Ch. 9 - A steel sphere of 0.25 in. diameter has a velocity...Ch. 9 - A steel sphere (SG = 7.8) of 13 mm diameter falls...Ch. 9 - A sheet of plastic material 0.5 in. thick, with...Ch. 9 - As part of the 1976 bicentennial celebration, an...Ch. 9 - What constant speed will be attained by a lead (SG...Ch. 9 - Assuming a critical Reynolds number of 0.1,...Ch. 9 - Glass spheres of 0.1 in. diameter fall at constant...Ch. 9 - A rotary mixer is constructed from two circular...Ch. 9 - Calculate the drag of a smooth sphere of 0.3 m...Ch. 9 - Calculate the drag of a smooth sphere of 0.5 m...Ch. 9 - A cylindrical chimney 0.9 m in diameter and 22.5 m...Ch. 9 - The resistance to motion of a good bicycle on...Ch. 9 - Ballistic data obtained on a firing range show...Ch. 9 - A standard marine torpedo is 0.533 m in diameter...Ch. 9 - A large truck has an essentially boxlike body that...Ch. 9 - At a surprise party for a friend youve tied a...Ch. 9 - A 0.5-m-diameter hollow plastic sphere containing...Ch. 9 - A simple but effective anemometer to measure wind...Ch. 9 - The Willis Tower (formerly the Sears Tower) in...Ch. 9 - It is proposed to build a pyramidal building with...Ch. 9 - Calculate the drag forces on a 1/200 scale model...Ch. 9 - A circular disk is hung in an air stream from a...Ch. 9 - A vehicle is built to try for the land-speed...Ch. 9 - An F-4 aircraft is slowed after landing by dual...Ch. 9 - A tractor-trailer rig has frontal area A = 102 ft2...Ch. 9 - A 180hp sports car of frontal area 1.72 m2, with a...Ch. 9 - An object falls in air down a long vertical chute....Ch. 9 - Prob. 99PCh. 9 - A light plane tows an advertising banner over a...Ch. 9 - The antenna on a car is 10 mm in diameter and 1.8...Ch. 9 - Consider small oil droplets (SG = 0.85) rising in...Ch. 9 - Standard air is drawn into a low-speed wind...Ch. 9 - A small sphere with D = 6 mm is observed to fall...Ch. 9 - A tennis ball with a mass of 57 g and diameter of...Ch. 9 - A water tower consists of a 12-m-diameter sphere...Ch. 9 - A cast-iron 12-pounder cannonball rolls off the...Ch. 9 - A rectangular airfoil of 40 ft span and 6 ft chord...Ch. 9 - A rectangular airfoil of 9 m span and 1.8 m chord...Ch. 9 - Why is it possible to kick a football farther in a...Ch. 9 - If CL = 1.0 and CD = 0.05 for an airfoil, then...Ch. 9 - A wing model of 5 in. chord and 2.5 ft span is...Ch. 9 - A barge weighing 8820 kN that is 10 m wide, 30 m...Ch. 9 - A spherical sonar transducer with 15 in. diameter...Ch. 9 - While walking across campus one windy day, an...Ch. 9 - If the mean velocity adjacent to the top of a wing...Ch. 9 - The NACA 23015 airfoil is to move at 180 mph...Ch. 9 - A human-powered aircraft has a gross weight of 240...Ch. 9 - WiffleTM balls made from light plastic with...Ch. 9 - A model airfoil of chord 6 in. and span 30 in. is...Ch. 9 - An antique airplane carries 50 m of external guy...Ch. 9 - How do cab-mounted wind deflectors for...Ch. 9 - An airplane with an effective lift area of 25 m2...Ch. 9 - The U.S. Air Force F-16 fighter aircraft has wing...Ch. 9 - A light airplane, with mass M = 1000 kg, has a...Ch. 9 - A light airplane has 35-ft effective wingspan and...Ch. 9 - Assume the Boeing 727 aircraft has wings with NACA...Ch. 9 - Jim Halls Chaparral 2F sports-racing cars in the...Ch. 9 - Some cars come with a spoiler, a wing section...Ch. 9 - Roadside signs tend to oscillate in a twisting...Ch. 9 - Air moving over an automobile is accelerated to...Ch. 9 - A class demonstration showed that lift is present...Ch. 9 - Rotating cylinders were proposed as a means of...Ch. 9 - A baseball pitcher throws a ball at 80 mph. Home...
Additional Engineering Textbook Solutions
Find more solutions based on key concepts
Four people are attempting to move a stage platform across the floor. If they exert the horizontal forces shown...
Engineering Mechanics: Statics
Why do brazed joints have an enhanced susceptibility to corrosion?
DeGarmo's Materials and Processes in Manufacturing
ICA 8-38
An ideal gas is kept in a 10-liter [L] container at a pressure of 1.5 atmospheres [atm] and a temperat...
Thinking Like an Engineer: An Active Learning Approach (4th Edition)
In each case, calculate the reaction at A and then draw the free-body diagram of segment AB of the beam in orde...
INTERNATIONAL EDITION---Engineering Mechanics: Statics, 14th edition (SI unit)
The spring has a stiffness k = 200 N/m and is unstretched when the 25-kg block is at A. Determine the accelerat...
Engineering Mechanics: Dynamics (14th Edition)
Determine the components of reaction at A and the tension in the cable needed to held the 800-lb cylinder in eq...
Engineering Mechanics: Statics
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- A square block weighing 1.1 kN and 250 mm on an edge slides down an incline on a film of oil 6 micrometer thick. Assuming a linear velocity profile in the oil and neglecting air resistance, what is the terminal velocity of the block in m/s? The viscosity of oil is 7mPa-s and the angle of inclination is 20deg.arrow_forwardA 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 platearrow_forwardA minivan is pulled by a tow truck at 60 kph. The boxlike van is 20m long, 6m high, and 3.75m wide. Estimate the skin friction, Df, on the van's top and sides. Take the density and viscosity of air as 0.0023 kg/m3 and 0.3758x10-6 N-s/m2.arrow_forward
- A flat plate with surface area of 3.4 m2m2 is sliding on a horizontal table with 4.2 mmmm thick oil layer on top. Force applied on the plate in the direction of movement is 2.6 NN . Dynamic viscosity of the oil is 0.89 x10-3 Ns/m2.Calculate the terminal velocity of the plate.arrow_forwardA flat metal block of mass 1.50 slug slides down a 25° incline. An oil film 0.006 in. thick and with a viscosity of 0.002 slug/ps extends between the block and the plane. The oil and the block have a contact surface of 1.0 p2. Calculate the terminal velocity of the block in p/s.arrow_forwardLaminar flow takes place between parallel plates 10 mm apart. The plates are inclined at 45° with the horizontal. For oil of viscosity 0.9 kg/m.s and mass density is 1260 kg/m³, the pressure at two points 1.0 m vertically apart are 80 kN/m2 and 250 kN/m2 when the upper plate moves at 2.00 m/s velocity relative to the lower plate but in opposite direction to flow determine velocity distribution, max. velocity and shear stress on the top plate.arrow_forward
- The belt in the Ögure moves at steady velocity V and skims the top of a tank of oil having viscosity. (a) Develop and expression for the required belt drive power in terms of h, L, b, V , and . Recalthat, for steady motion, power is equal to force velocity.(b) What power is required if the belt moves at 5 m/s over SAE 50W oil ( = 0:86 kg/ms) withh = 2 cm, L = 2 m, and b = 0:5 marrow_forwardTwo large fixed parallel planes are 12 mm apart. The space between the surfaces Example is filled with oil of viscosity 0.972 N.s/m². A flat thin plate 0.25 m² area moves through the oil at a velocity of 0.3 m/s. Calculate the drag force: (1) When the plate is equidistant from both the planes, and (ii) When the thin plate is at a distance of 4 mm from one of the plane surfaces. Fixed parallel plane 6 mm Plate 0.3 m/s F 6 mm 12 mmarrow_forwardCalculate the pressure drop of starfruit juice drink that flows with a velocity of 1.5 m/sthrough 1.2 m of horizontal sanitary stainless steel tubing with 9 mm inner diameter. Thedensity and viscosity of starfruit juice drink are 2300 kg m -3 and 0.8 x 10 -3 kg m -1 s -1 ,respectively. Calculate the energy losses due to the friction. Use the Moody diagram tosolve this problem.arrow_forward
- An oil film of thickness 1.5 mm is used for lubrication between a square plate of size 0.9 m x 0.9 m and an inclined plane having an angle of inclination 20 degrees. The weight of the square is 392.4 and it slides down the plane with a uniform velocity of 0.2 m/s. The dynamic viscosity of the oil in poise is.arrow_forwardWhat is the terminal velocity attained by a square plate 0.3m x 0.3m weighing 45N that is allowed to slide down an inclined plane which is laid to a slope of 1 vertical and 1.5 horizontal. 0.02 mm thick oil film of viscosity 2x10-3 Ns/m2 is maintained between the inclined plane and the plate.arrow_forwardA square block weighing 1.1 KN and 250 mm on an edge slides down an 20 degrees inclined on a film of oil 6.0 micrometer thick. Assuming a linear velocity profile in the oil, what is the terminal speed of the block in m/s. The viscosity of the oil is 7 mPa-s.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Elements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University Press
Mechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSON
Thermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEY
Mechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage Learning
Engineering Mechanics: StaticsMechanical EngineeringISBN:9781118807330Author:James L. Meriam, L. G. Kraige, J. N. BoltonPublisher:WILEY
Elements Of Electromagnetics
Mechanical Engineering
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Oxford University Press
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:9780134319650
Author:Russell C. Hibbeler
Publisher:PEARSON
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:9781259822674
Author:Yunus A. Cengel Dr., Michael A. Boles
Publisher:McGraw-Hill Education
Control Systems Engineering
Mechanical Engineering
ISBN:9781118170519
Author:Norman S. Nise
Publisher:WILEY
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:9781337093347
Author:Barry J. Goodno, James M. Gere
Publisher:Cengage Learning
Engineering Mechanics: Statics
Mechanical Engineering
ISBN:9781118807330
Author:James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:WILEY
Heat Transfer – Conduction, Convection and Radiation; Author: NG Science;https://www.youtube.com/watch?v=Me60Ti0E_rY;License: Standard youtube license