Fluid Mechanics Fundamentals And Applications
3rd Edition
ISBN: 9780073380322
Author: Yunus Cengel, John Cimbala
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Textbook Question
Chapter 11, Problem 61CP
Why is flow separation in flow over cylinders delayed when the boundary layer is turbulent?
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Please find the torsional yield strength, the yield strength, the spring index, and the mean diameter. Use: E = 28.6 Mpsi, G = 11.5 Mpsi, A = 140 kpsi·in, m = 0.190, and relative cost= 1.
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A group of 23 power transistors, dissipating 2 W each, are to be cooled by attaching them to a black-anodized square aluminum plate and mounting the plate on the wall of a room at 30°C. The emissivity of the transistor and the plate surfaces is 0.9. Assuming the heat transfer from the back side of the plate to be negligible and the temperature of the surrounding surfaces to be the same as the air temperature of the room, determine the length of the square plate if the average surface temperature of the plate is not to exceed 50°C. Start the iteration process with an initial guess of the size of the plate as 43 cm.
The properties of air at 1 atm and the film temperature of (Ts + T)/2 = (50 + 30)/2 = 40°C are k = 0.02662 W/m·°C, ν = 1.702 × 10–5 m2 /s, Pr = 0.7255, and β = 0.003195 K–1.
Multiple Choice
0.473 m
0.284 m
0.513 m
0.671 m
Chapter 11 Solutions
Fluid Mechanics Fundamentals And Applications
Ch. 11 - Which bicyclist is more likely to go faster: one...Ch. 11 - Consider laminar flow over a flat plate. How does...Ch. 11 - Define the frontal area of a body subjected to...Ch. 11 - Define the planform area of a body subjected to...Ch. 11 - Prob. 5CPCh. 11 - Prob. 6CPCh. 11 - What is the difference between streamlined and...Ch. 11 - Prob. 8CPCh. 11 - What is drag? What causes it? Why do we usually...Ch. 11 - Prob. 10CP
Ch. 11 - During flow over a given body, the drag force, the...Ch. 11 - During flow over a given slender body such as a...Ch. 11 - What is terminal velocity? How is it determined?Ch. 11 - What is the difference between skin friction drag...Ch. 11 - What is the effect of surface roughness on the...Ch. 11 - Prob. 16CPCh. 11 - What is flow separation? What causes it? What is...Ch. 11 - Prob. 18CPCh. 11 - In general, how does the drag coefficient vary...Ch. 11 - Fairings are attached to the front and back of a...Ch. 11 - Prob. 21PCh. 11 - The resultant of the pressure and wall shear...Ch. 11 - Prob. 23PCh. 11 - Prob. 24PCh. 11 - To reduce the drag coefficient and thus to improve...Ch. 11 - A circular sign has a diameter of 50 cm and is...Ch. 11 - Prob. 28EPCh. 11 - Prob. 29PCh. 11 - At highway speeds, about half of the power...Ch. 11 - A submarine can be treated as an ellipsoid with a...Ch. 11 - Prob. 32EPCh. 11 - Prob. 33PCh. 11 - A 70-kg bicyclist is riding her 1 5-kg bicycle...Ch. 11 - A wind turbine with two or four hollow...Ch. 11 - Prob. 37EPCh. 11 - During steady motion of a vehicle on a level road,...Ch. 11 - Prob. 40PCh. 11 - Prob. 41PCh. 11 - Prob. 42PCh. 11 - Prob. 43PCh. 11 - The drag coefficient of a vehicle increases when...Ch. 11 - To reduce the drag coefficient and thus to improve...Ch. 11 - How is the average friction coefficient determined...Ch. 11 - What fluid property is responsible for the...Ch. 11 - What does the friction coefficient represent in...Ch. 11 - Prob. 49PCh. 11 - The local atmospheric pressure in Denver, Colorado...Ch. 11 - The top surface of the passenger car of a train...Ch. 11 - The forming section of a plastics plant puts out a...Ch. 11 - Prob. 54EPCh. 11 - Prob. 55EPCh. 11 - Air at 25C and 1 atm is flowing over a long flat...Ch. 11 - Prob. 58PCh. 11 - Prob. 59PCh. 11 - Prob. 60PCh. 11 - Why is flow separation in flow over cylinders...Ch. 11 - Prob. 62CPCh. 11 - Prob. 63CPCh. 11 - Prob. 64PCh. 11 - A 1ong 5-cm-diameter steam pipe passes through...Ch. 11 - Consider 0.8-cm-diameter hail that is falling...Ch. 11 - Prob. 67EPCh. 11 - Prob. 68PCh. 11 - Prob. 69PCh. 11 - Prob. 70PCh. 11 - Prob. 71EPCh. 11 - One of the popular demonstrations in science...Ch. 11 - Prob. 73CPCh. 11 - Air is flowing past a symmetrical airfoil at an...Ch. 11 - What is stall? What causes an airfoil to stall?...Ch. 11 - Prob. 76CPCh. 11 - Air is flowing past a symmetrical airfoil at zero...Ch. 11 - Both the lift and the drag of an airfoil increase...Ch. 11 - Prob. 79CPCh. 11 - Prob. 80CPCh. 11 - Prob. 81CPCh. 11 - Prob. 82CPCh. 11 - Prob. 83CPCh. 11 - How do flaps affect the lift and the drag of...Ch. 11 - A small aircraft has a wing area of 35 m2 a lift...Ch. 11 - Consider an aircraft that takes off at 260 km/h...Ch. 11 - Prob. 87PCh. 11 - Prob. 88EPCh. 11 - Prob. 89PCh. 11 - A tennis ball with a mass of 57 and a diameter of...Ch. 11 - Prob. 92EPCh. 11 - Prob. 93PCh. 11 - Consider a light plane that has a total weight of...Ch. 11 - A small airplane has a total mass of 1800 kg and a...Ch. 11 - Prob. 97PCh. 11 - Prob. 98PCh. 11 - A 2-zn-high, 4-zn-wide rectangular advertisement...Ch. 11 - 11-97 A plastic boat whose bottom surface can be...Ch. 11 - Prob. 102PCh. 11 - Prob. 103EPCh. 11 - A commercial airplane has a total mass of 150.000...Ch. 11 - Prob. 105PCh. 11 - A paratrooper and his 8-m-diameter parachute weigh...Ch. 11 - Prob. 107PCh. 11 - Prob. 108PCh. 11 - Prob. 110PCh. 11 - Prob. 112PCh. 11 - Prob. 113PCh. 11 - Prob. 114PCh. 11 - Prob. 117PCh. 11 - Prob. 118PCh. 11 - Prob. 119PCh. 11 - Prob. 120PCh. 11 - Prob. 121PCh. 11 - The region of flow trailing the body where the...Ch. 11 - Prob. 123PCh. 11 - Prob. 124PCh. 11 - Prob. 125PCh. 11 - Prob. 126PCh. 11 - Prob. 127PCh. 11 - Prob. 128PCh. 11 - An airplane has a total mass of 3.000kg and a wing...Ch. 11 - Prob. 130PCh. 11 - Write a report on the history of the reduction of...Ch. 11 - Write a report oil the flips used at the leading...Ch. 11 - Large commercial airplanes cruise at high...Ch. 11 - Many drivers turn off their air conditioners and...
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- A 40-cm-diameter, 127-cm-high cylindrical hot water tank is located in the bathroom of a house maintained at 20°C. The surface temperature of the tank is measured to be 44°C and its emissivity is 0.4. Taking the surrounding surface temperature to be also 20°C, determine the rate of heat loss from all surfaces of the tank by natural convection and radiation. The properties of air at 32°C are k=0.02603 W/m-K, v=1.627 x 10-5 m²/s, Pr = 0.7276, and ẞ = 0.003279 K-1 The rate of heat loss from all surfaces of the tank by natural convection is The rate of heat loss from all surfaces of the tank by radiation is W. W.arrow_forwardA 2.5-m-long thin vertical plate is subjected to uniform heat flux on one side, while the other side is exposed to cool air at 5°C. The plate surface has an emissivity of 0.73, and its midpoint temperature is 55°C. Determine the heat flux subjected on the plate surface. Uniform heat flux -Plate, € = 0.73 Cool air 5°C 7 TSUIT Given: The properties of water at Tf,c= 30°C. k=0.02588 W/m.K, v=1.608 x 10-5 m²/s Pr = 0.7282 The heat flux subjected on the plate surface is W/m²arrow_forwardHot water is flowing at an average velocity of 5.82 ft/s through a cast iron pipe (k=30 Btu/h-ft-°F) whose inner and outer diameters are 1.0 in and 1.2 in, respectively. The pipe passes through a 50-ft-long section of a basement whose temperature is 60°F. The emissivity of the outer surface of the pipe is 0.5, and the walls of the basement are also at about 60°F. If the inlet temperature of the water is 150°F and the heat transfer coefficient on the inner surface of the pipe is 30 Btu/h-ft².°F, determine the temperature drop of water as it passes through the basement. Evaluate air properties at a film temperature of 105°C and 1 atm pressure. The properties of air at 1 atm and the film temperature of (Ts+ T∞)/2 = (150+60)/2 = 105°F are k=0.01541 Btu/h-ft-°F. v=0.1838 × 10-3 ft2/s, Pr = 0.7253, and ẞ = 0.00177R-1arrow_forward
- hand-written solutions only, please. correct answers upvoted!arrow_forwardhand-written solutions only, please. correct answers upvoted!arrow_forward! Required information Consider a flat-plate solar collector placed horizontally on the flat roof of a house. The collector is 1.3 m wide and 2.8 m long, and the average temperature of the exposed surface of the collector is 42°C. The properties of air at 1 atm and the film temperature are k=0.02551 W/m-°C, v = 1.562 × 10-5 m²/s, Pr = 0.7286, and ẞ= 0.003356 K-1 Determine the rate of heat loss from the collector by natural convection during a calm day when the ambient air temperature is 8°C. The rate of heat loss from the collector by natural convection is W.arrow_forward
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