Reynolds' number is derived from which of the following components?
a. Velocity of flow, radius of tube, density of gas, and velocity of gas
b. Velocity of flow, length of tube, density of gas, and velocity of gas
c. Velocity of gas, radius of tube, viscosity of flow, and density of gas
d. Flow asymmetry, shape of tube, density of gas, and length of tube
ANS: A
The formula for Reynolds' number is NR = v ? d ? (2r/?), where v is the velocity of the flow; r is the radius of the tube, and d and ? are the density and viscosity of the gas, respectively.
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