Applied Fluid Mechanics (7th Edition)
7th Edition
ISBN: 9780132558921
Author: Robert L. Mott, Joseph A. Untener
Publisher: PEARSON
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Chapter 17, Problem 17.22PP
To determine
The drag caused by the windshield
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V 13 u
. The velocity profile for boundary layer over a
3 y
1
13
y
Ux
flat plate is given by,
u.
2 8x
2 8x
280 Vx
where, 8x =
13 u
(a) Develop the expression for friction
coefficient.
(b) Find the expression for average drag
coefficient over length L.
Note: Don't copy from other websites solution, those are wrong solutions.
The trailer travels at U = 39 mi/h. The air is still and has a temperature of 60°F. Assume the surfaces are smooth and flat Consider both laminar and turbulent boundary layers. (Figure 1)
Part A :Determine the drag acting on each side of the trailer truck.
In a laboratory, the drag forces that are generated on vehicles that carry are being studied posters (thin flat plates) on the ceiling, for this we first want to determine the coefficient of drag that is generated on a cart without carrying the sign using a force meter (case 1). The Projected frontal area of the carriage is 2 m2 and the force indicated by the meter in case 1 is 300N when moving at 27 m/s. Considering air conditions of T = 20° C, ρ = 1.2 kg/m3, ? = 1.5 ∗10−5m2/s:
a) Calculate the drag coefficient of the trolley in case 1
b) Calculate the drag coefficient that is generated on a sign 1 meter long and 0.2 meters of height (flat plate) placed transverse to the flow moving at the same speed of the carriage as illustrated in case 2. The transition Reynolds number is known to be 5 ∗ 10^5
c) Calculate the drag force that is generated only on the plate (consider both sides)
d) Draw the free body diagram of the carriage for case 2 and calculate the total force on the cart when…
Chapter 17 Solutions
Applied Fluid Mechanics (7th Edition)
Ch. 17 - A cylinder 25 mm in diameter is placed...Ch. 17 - As part of an advertising sign on the top of a...Ch. 17 - Determine the terminal velocity (see Section 2.6.4...Ch. 17 - Calculate the moment at the base of a flagpole...Ch. 17 - A pitcher throws a baseball without spin with a...Ch. 17 - A parachute in the form of a hemispherical cup 1.5...Ch. 17 - Calculate the required diameter of a parachute in...Ch. 17 - A ship tows an instrument in the form of a 30...Ch. 17 - A highway sign is being designed to withstand...Ch. 17 - Assuming that a semitrailer behaves as a square...
Ch. 17 - A type of level indicator incorporates four...Ch. 17 - Prob. 17.12PPCh. 17 - A bulk liquid transport truck incorporates a...Ch. 17 - A wing on a race car is supported by two...Ch. 17 - Prob. 17.15PPCh. 17 - The four designs shown in Fig. 17.16 for the cross...Ch. 17 - Prob. 17.17PPCh. 17 - Prob. 17.18PPCh. 17 - An antenna in the shape of a cylindrical rod...Ch. 17 - Prob. 17.20PPCh. 17 - Prob. 17.21PPCh. 17 - Prob. 17.22PPCh. 17 - Assume that curve 2 in Fig. 17.5 is a true...Ch. 17 - Prob. 17.24PPCh. 17 - Prob. 17.25PPCh. 17 - A small, fast boat has a specific resistance ratio...Ch. 17 - Prob. 17.27PPCh. 17 - Assume that Fig. 17.11 shows the performance of...Ch. 17 - Calculate the total drag on an airfoil that has a...Ch. 17 - Prob. 17.30PPCh. 17 - Prob. 17.31PPCh. 17 - Prob. 17.32PPCh. 17 - Prob. 17.33PP
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- Thank you!! An aircraft weighing 65.2 kN when empty has a wing plan form area A of 62.3 m^2 . It cruises at a velocity of 900 km/h and a 4.0 degree angle of attack and altitude of 8500m. Also, the wing characteristics of the airfoil are shown. (a) Determine the allowable weigh of the cargo (b) and if the wingspan s is 20m determine the induce drag coefficient C_Di.arrow_forwardA marine vehicle tows a hollow cylinder of 760 mm diameter and 5.5 m length. The cylinder is fully submerged in seawater with its axis aligned to the flow direction. Estimate the allocated power the marine vehicle needs to drag this cylinder at a speed of 6 knots and also calculate the thickness of the boundary layer at the trailing edge.arrow_forwarda smooth flat plate of length 5 m and width 2 m is moving with a velocity of 4 m/s in stationary air of density as 1.25 kg/m³ and kinematic viscosity 1.5 x 10-5 m²/s. determine thickness of the boundary layer at the trailing edge of the smooth plate. find the total drag on one side of the plate assuming that the boundary layer is turbulent from the very beginning.arrow_forward
- A flagpole 16 m high has the shape of a cylinder 100 mm in diameter. The air temperature is 30°C and the atmospheric pressure is 101 KPaa. With what speed is the air blowing against the pole if the moment developed at the base is 2.7 KN.m? The drag coefficient is 1.3.arrow_forwardA pitcher throws a baseball without spin with a velocity of 20 m/s. If the ball has a circumference of 225 mm, calcu- late the drag force on the ball in air at 30°C.arrow_forwardAn antenna in the shape of a cylindrical rod projects from the top of a locomotive. If the antenna is 42 in long and 0.200 in. in diameter, compute the drag force on it when the locomotive is traveling at 160 mph in still air at -20°F.arrow_forward
- For a new sailboat, a designer wants to determine the drag force that may be expected at a given speed. To do so, she places a model of the proposed hull in a test channel and uses three cables to keep its bow on the centerline of the channel. Dynamometer readings indicate that for a given speed, the tension is 40 lb in cable AB and 60 lb in cable AE. Determine the drag force exerted on the hull and the tension in cable AC.arrow_forwardB2 is flying at an altitude of 43,000 ft and a speed of 400 KTAS under standard atmospheric conditions. If the average aerodynamic chord is 39,6 ft, calculate the Reynolds number and the average % aerodynamic chord present on the wingarrow_forwardQuestion 4 а. Explain briefly what is meant by drag and its form.arrow_forward
- Prob.7. A smooth flat plate of length 5 m and width 2 m is moving with a velocity of 4 m/s in stationary air of density 1.25 kg/m and kinematic viscosity 1.5 x 10-5 m2/s. Determine thickness of the boundary layer at the trailing edge of the smooth plate. Find the total drag on one side of the plate assuming that the boundary layer is turbulent from the very beginning.arrow_forwardJane wants to estimate the drag coefficient of herself on herbicycle. She measures the projected frontal area to be 0.40 m2and the rolling resistance to be 0.80 N . s/m. The mass ofthe bike is 15 kg, while the mass of Jane is 80 kg. Jane coasts down a long hill that has a constant 4° slope. (SeeFig. ) She reaches a terminal (steady-state) speed of14 m/s down the hill. Estimate the aerodynamic drag coefficient CD of the rider and bicycle combination.arrow_forwardThe rectangular wing of a trainer aircraft has a wingspan of 15.5 m and a chord of 3 m, the chord being parallel to the direction of the airflow. The aircraft is flying at standard sea level conditions with a velocity of 102 mps. Considering laminar flow only, determine total skin friction drag (N, 2 decimals).arrow_forward
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