HEAT+MASS TRANSFER:FUND.+APPL.
6th Edition
ISBN: 9780073398198
Author: CENGEL
Publisher: RENT MCG
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Chapter 7, Problem 2CP
What is drag? What causes it? Why do we usually try to minimize it?
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Chapter 7 Solutions
HEAT+MASS TRANSFER:FUND.+APPL.
Ch. 7 - What is the difference between the upstream...Ch. 7 - What is drag? What causes it? Why do we usually...Ch. 7 - Define the frontal area of a body subjected to...Ch. 7 - Air at 25C and 1 atm is flowing over a long flat...Ch. 7 - Air at 15C and 1 atm flows over a 0.3-m-wide plate...Ch. 7 - Water at 43.3C flows over a large plate at a...Ch. 7 - Prob. 57PCh. 7 - Prob. 97PCh. 7 - Prob. 102P
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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
- What is flow separation? What causes it? What is the effect of flow separation on the drag coefficient?arrow_forwardThe drag coefficient of a car at the design conditions of 1 atm, 70°F, and 60 mi/h is to be determined experimentally in a large wind tunnel in a full-scale test. The frontal area of the car is 22.26 ft2. If the force acting on the car in the flow direction is measured to be 68 lbf, determine the drag coefficient of this car.arrow_forwardA long plate is placed parallel to a 13 m/s air stream at 80 kPa and 250 K. At what distance along the plate will the boundary layer be 0.5 mm thick? Give our answer in mm.arrow_forward
- During a high Reynolds number experiment, the total drag force acting on a spherical body of diameter D = 11 cm subjected to airflow at 1 atm and 5°C is measured to be 5.0 N. The pressure drag acting on the body is calculated by integrating the pressure distribution (measured by the use of pressure sensors throughout the surface) to be 4.75 N. Determine the friction drag coefficient of the sphere.arrow_forwardWhat is the effective angle of attack ? What is the induced drag ? Show them by drawing a sketch and explain.arrow_forwardA 1.2-in-outer-diameter pipe is to span across a river at a 115-ft-wide section while being completely immersed in water. The average flow velocity of the water is 8 ft/s, and its temperature is 70°F. Determine the drag force exerted on the pipe by the river.arrow_forward
- A 0.80-m-diameter, 1.2-m-high garbage can is found in the morning tipped over due to high winds during the night. Assuming the average density of the garbage inside to be 150 kg/m3 and taking the air density to be 1.25 kg/m3, estimate the wind velocity during the night when the can was tipped over. Take the drag coefficient of the can to be 0.7.arrow_forwardHow does a winglet on the wing tip reduce induced drag? Which drag is higher if an aircraft is flying at 100knts and the L/Dmax is 120knts? How do you know this?arrow_forwardWhat is the effect of streamlining on (a) friction drag and (b) pressure drag? Does the total drag acting on a body necessarily decrease as a result of streamlining? Explain.arrow_forward
- A person is driving his motorcycle at a speed of 90 km/h in air at 20°C. The frontal area of the motorcycle and driver is 0.75 m2. If the drag coefficient under these conditions is estimated to be 0.90, the drag force acting on the car in the flow direction is (a) 379 N (b) 204 N (c) 254 N (d ) 328 N (e) 420 Narrow_forwardDuring a winter day, wind at 70 km/h, 5°C, and 1 atm is blowing parallel to a 4-m-high and 15-m-long wall of a house. Approximating the wall surfaces as smooth, determine the friction drag acting on the wall. What would your answer be if the wind velocity has doubled? How realistic is it to treat the flow over side wall surfaces as flow over a flat plate?arrow_forwardAir at 30oC (density=1.165 kg/m3, kinematic viscosity = 16x10-5 m2/s) flows over a flat plate at a free stream velocity of 4.19 m/s. Determine the boundary layer thickness at distances of 0.2m, 0.5 m and 0.8 m. Also determine the skin friction coefficients, both local and average, at these locations.arrow_forward
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