Heat and Mass Transfer: Fundamentals and Applications
5th Edition
ISBN: 9780073398181
Author: Yunus A. Cengel Dr., Afshin J. Ghajar
Publisher: McGraw-Hill Education
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Chapter 7, Problem 5CP
Define the frontal area of a body subjected to external flow. When is it appropriate to use the frontal area in drag and lift calculations?
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Define the planform area of a body subjected to external flow. When is it appropriate to use the planform area in drag and lift calculations?
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Chapter 7 Solutions
Heat and Mass Transfer: Fundamentals and Applications
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...
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- b) What is induced drag on wings? Can the induced drag be minimized by (1) long and narrow wings or (2) short and wide wings? Please justify your answer.arrow_forwardЕxample 5 The total mass, wing area, cruising speed, and air resistance power of a small aircraft are 1800 kg, 42 m², 280 km/hr, and 190 kW, respectively. Determine the lift and drag coefficients of this airplane while cruising at an altitude of 4000 m.arrow_forwardis the drag coefficient 2 or 0.2?arrow_forward
- An airplane is cruising at a velocity of 950 km/h in air whose density is 0.526 kg/m3. The airplane has a wing planform area of 90 m2. The lift and drag coefficients on cruising conditions are estimated to be 2.0 and 0.06, respectively. The power that needs to be supplied to provide enough trust to overcome wing drag is (a) 21,500 kW (b) 19,300 kW (c) 23,600 kW (d ) 25,200 kW (e) 26,100 kWarrow_forwardWhat effect does increasing the Reynolds number have on coefficient of lift and drag?arrow_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_forward
- The form drag coefficient of a certain light aircraft is equal to 0.02. Its skin friction drag coefficient is 0.009. Determine its maximum lift-to-drag ratio (nearest hundredths) if its interference drag is 8 percent of its profile drag. The aircraft has an elliptical wing with an aspect ratio of 6.9.arrow_forwardWhat is flow separation? What causes it? What is the effect of flow separation on the drag coefficient?arrow_forwardA 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_forward
- Fairings are attached to the front and back of a cylindrical body to make it look more streamlined. What is the effect of this modification on the (a) friction drag, (b) pressure drag, and (c) total drag? Assume the Reynolds number is high enough so that the flow is turbulent for both cases.arrow_forwardDuring a winter day, wind at 58 km/h, 5°C, and 1 atm is blowing parallel to a 3.5-m-high and 9-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_forwardA car is moving at a speed of 70 km/h in air at 20°C. The frontal area of the car is 2.4 m2. If the drag force acting on the car in the flow direction is 205 N, the drag coefficient of the car is (a) 0.312 (b) 0.337 (c) 0.354 (d ) 0.375 (e) 0.391arrow_forward
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