Problem 4. Air at STP flows over the top and bottom of a flat plate that is L₁ = 0.8 m by L2 = 0.4 m at avelocity of U = 5.0 m/s. Determine the shear stress at the end of the plate and the total drag when the flow isaligned with (a) L1 and (b) L2. (c) Briefly explain why there is a difference in your answers to parts (a) and (b)even though the area is the same.

Answered: Image /qna-images/answer/a3d0bfd8-6271-410a-8023-b52ee970705c.jpg

Answered: Problem 4. Air at STP flows over the…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Air at 20 °C flows at V = 10 m/s over a flat plate of length L= 1.52 m and width W = 2 m.Calculate the boundary layer thickness at the trailing edge of plate and drag force on one sideof plate if:a. Surface of plate is smooth.b. Surface of plate is rough.The air properties at 20 °C are: Density, ? = 1.2 kg/m3and dynamic viscosity, ? = 1.8x 10-5kg/m·s and kinematic viscosity, ν = 1.516×10-5m2/s. kindly give me the solution of this problem with correct and logical reasoning.
Air at 20 °C flows at V = 10 m/s over a flat plate of length L= 1.52 m and width W = 2 m.Calculate the boundary layer thickness at the trailing edge of plate and drag force on one sideof plate if:a. Surface of plate is smooth.b. Surface of plate is rough.The air properties at 20 °C are: Density, ? = 1.2 kg/m3and dynamic viscosity, ? = 1.8x 10-5kg/m·s and kinematic viscosity, ν = 1.516×10-5m2/s. I got the first solution which was wrong kindly solve it correctly
Air at 20 °C flows at V = 10 m/s over a flat plate of length L= 1.52 m and width W = 2 m.Calculate the boundary layer thickness at the trailing edge of plate and drag force on one sideof plate if:a. Surface of plate is smooth.b. Surface of plate is rough.The air properties at 20 °C are: Density, ? = 1.2 kg/m3and dynamic viscosity, ? = 1.8x 10-5kg/m·s and kinematic viscosity, ν = 1.516×10-5m2/s
6- A uniform free stream of air at 0.8 m/s flows over a flat plate (4 m long x 1 m wide). Assuming the boundary layer to be laminar on the plate and the velocity profile is: и Find the ratio of the drag force on the front half portion to the drag %3D U force on the rear half portion of the plate. (p = 1.2 kg/m ; v= 1.51×10* m³/s) [2.42]
Read the question carefully and give me right solutions with clear calculations. The air flows past a 1m diameter disk oriented normal to upstream flow at 6.8m/s. The pressure distribution on front of the disk is function of the radius, where p(r) = (25 − 100 r2 ) N/m2 , and the pressure acts uniformly on back side with suction pressure of pback = −22 P a. a. Determine the total drag force on the disk. b. Calculate the drag coefficient for the disk . (Density = 1.25 kg/m3 ).
Q1 A car is traveling at sea level at a constant speed. It weighs 2500-lbs, has a frontal area of 20 ft² and has a 90% drivetrain efficiency. Its engine runs at 4000 rev/min, producing 168 ft-lb of torque. The drive axle slippage of 2%, 14-inch-radius wheels, and an overall gear reduction ratio of 2.5 to 1. What is its drag coefficient?
2. Air at 40 °C moves over a long flat plate with a uniform free stream velocity of U = 900 m/s. Assume the boundary layer formed above the surface of the plate starts at the tip of the leading edge and the velocity profile inside the boundary layer has power-law form as Re, <107 8 10' < Re, <10* 7 - (). for u Sx
Need Solution through 15min
A helicopter during a test has its four blades turning at 89 rpm with the blades oriented parallel to the plane of rotation, where each blade is 3.5 m long, and the average width is 200 mm, Transition is at a Reynolds number on 10^ 6. Find out what power is needed to maintain this rotation of the four blades? Consider only skin drag. Take air density = 1.225kg/m^3 and air viscosity = 1.78 X 10E-5 Pa.s %3D
Two 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 mm
Flow straighteners consist of arrays of narrow ducts placed in a flow to remove swirl and other transverse (secondary) velocities. One element can be idealised as a square box with thin sides as shown below. Calculate the pressure drop across a box with L=22 cm and a= 2.7 cm, if air with free-stream velocity of Uo = 11 m/s flows though the straightener. Use laminar flat-plate theory and take u = 1.85 x 10-5 Pa.s and p = 1.177kg/m³ . %3D %3D a Uo Figure 1: Flow across straighteners.

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