# In deriving Berno

(a) Reynolds’s number,

Where,

ρ = density of the fluid

v = largest average velocity of the fluid

D = diameter of the duct

μ = viscosity of the fluid

We have,

Density of the blood, ρ = 1.06 × 103 kg/m3

Reynolds’s number for laminar flow in duct, Re = 2000

Viscosity of the blood, μ = 2.084 × 10-3 Nm/s

Thus,

Largest average velocity,

= 1.962 m/s

(b) Dissipative forces are more important when flow velocity is increasing because increase in flow leads to turbulence.

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