SSC JE Mechanical Engineering 2018 Set 2 Paper

Question : 176 of 200

Marks: +1, -0

Reynolds number for non-circular cross section is:
[V = mean velocity
v = kinematic viscosity
P = Ratio of corss sectional area of the wetter perimeter]
A.

{V.4P}/ v

{V.P}/ v

{V.2P}/ {4v}

{V.P}/ {4v }

A Only
B Only
C Only
D Only

Validate

Solution:

Reynold number is the function of density, velocity, characteristic length and viscosity. So for rectangular cross-section characteristic length

(L_C={4×\wetted \area}/(\Perimeter))

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