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Process Equipment and Plant Design

Process Equipment and Plant Design
Value of Peclet number = 0, is the representative of

Eddy diffusivity = 0
Complete back mixing
Laminar flow
Plug flow

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Process Equipment and Plant Design
Elastic failure of a material occurs, when the tensile stress equals yield strength, yield point or the elastic limit. Also, the elastic failure occurs according to maximum strain theory, when the maximum tensile strain equals (where, σ = yield strength and E = modulus of elasticity)

E/σ
E
Σ
Σ/E

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Process Equipment and Plant Design
In a shell and tube heat exchanger having square pitch, the shell side equivalent diameter is given by (where, P = pitch, d = outside diameter of the tube)

(P² - πd²/4)/πd
4P²/πd
Πd/4P²
4(P² - πd²/4)/πd

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Process Equipment and Plant Design
The absorption factor is defined as (where, S₁ = slope of the equilibrium curve, S₂ = slope of the operating line)

S₁.S₂
1/S₁.S₂
S₁/S₂
S₂/S₁

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Process Equipment and Plant Design
The ratio of tube length to shell diameter in case of liquid shell and tube heat exchanger ranges from

2 to 3
3 to 5
6 to 12
4 to 8

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Process Equipment and Plant Design
In a multipass shell and tube heat exchanger, the problem of differential expansion between the shell and tube passes is taken care of by using a

U-bend
Floating head tube sheet
Neither A nor B
Either A or B

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