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adoni [48]
2 years ago
13

What is the physical significance of the Reynolds number?. How is defined for external flow over a plate of length L.

Engineering
1 answer:
yanalaym [24]2 years ago
7 0

Answer:

Re=\dfrac{\rho\ v\ l}{\mu }

Explanation:

Reynolds number:

  Reynolds number describe the type of flow.If Reynolds number is too high then flow is called turbulent flow and Reynolds is  low then flow is called laminar flow .

Reynolds number is a dimensionless number.Reynolds number given is the ratio of inertia force to the viscous force.

Re=\dfrac{F_i}{F_v}

For plate can be given as

Re=\dfrac{\rho\ v\ l}{\mu }

Where  ρ is the density of fluid , v is the average velocity of fluid and μ is the dynamic viscosity of fluid.

Flow on plate is a external flow .The values of Reynolds number for different flow given as

Reynolds\ number\is \ >\ 5 \times 10 ^5\ then\ flow\ will\ be\ turbulent.

Reynolds\ number\is \

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Answer:

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7 0
3 years ago
The 10-lb block is pressed against the spring so as to compress it 2 ft when it is at a point A. If the plane is smooth, determi
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Answer:

The distance measure from the wall = 36ft

Explanation:

Given Data:

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Using the principle of work and energy,

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Substituting, we have

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But tan ∅ = 3/4

∅ = tan⁻¹3/4

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From uniform acceleration,

S = S₀ + ut + 1/2gt²

It can be written as

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Substituting, we have

0 = 3 + 33.09 * sin 36.87 * t -(1/2 * 32.2 *t²)

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Solving it quadratically, we obtain t = 1.36s

The distance measure from the wall is given by the formula

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Substituting, we have

d = 33.09 * cos 36. 87 * 1.36

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