Find an expression for the gauge pressure at station 1 in terms of V₁, D₁, D2, d, e, and p. What assumptions do you have to make to solve this problem? What is the force, F, required to hold the cone in place? You may ignore the weight of the cone. Use the following values: V₁ = 20 m/s, D₁ = 30 cm, D₂ = 60 cm, and d = 58 cm. You may assume that the air density is at standard conditions, p = 1.225 kg/m³.

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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3. Air is flowing down a circular duct as shown in the figure. At station 1 the velocity is V₁ and the
duct diameter is D₁. The duct gradually enlarges to station 2, where the air exits to the atmosphere,
and the diameter is D₂. A conical centerbody with a cone angle of 30° is inserted into the duct
exit. The diameter of the cone base is d. You may assume that the velocity is low enough that p =
constant.
control surface
V₂
1
0 = 30°
V₂
F
Figure for problem 3.
(a) Find an expression for the gauge pressure at station 1 in terms of V₁, D₁, D₂, d, e, and p.
What assumptions do you have to make to solve this problem?
(b) What is the force, F, required to hold the cone in place? You may ignore the weight of the
cone. Use the following values: V₁ = 20 m/s, D₁ = 30 cm, D₂ = 60 cm, and d = 58 cm. You
may assume that the air density is at standard conditions, p = 1.225 kg/m².
Transcribed Image Text:3. Air is flowing down a circular duct as shown in the figure. At station 1 the velocity is V₁ and the duct diameter is D₁. The duct gradually enlarges to station 2, where the air exits to the atmosphere, and the diameter is D₂. A conical centerbody with a cone angle of 30° is inserted into the duct exit. The diameter of the cone base is d. You may assume that the velocity is low enough that p = constant. control surface V₂ 1 0 = 30° V₂ F Figure for problem 3. (a) Find an expression for the gauge pressure at station 1 in terms of V₁, D₁, D₂, d, e, and p. What assumptions do you have to make to solve this problem? (b) What is the force, F, required to hold the cone in place? You may ignore the weight of the cone. Use the following values: V₁ = 20 m/s, D₁ = 30 cm, D₂ = 60 cm, and d = 58 cm. You may assume that the air density is at standard conditions, p = 1.225 kg/m².
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