The condition for the onset of turbulent flow is that the Reynolds number reaches the 2000 value.
The transition from laminar to turbulent flow in a Pipe depends upon the value of a mathematical quantity equal to the average velocity of flow times the diameter of the tube times the mass density of the fluid divided by its absolute Viscosity.
This mathematical quantity, a pure number without dimensions, became known as the Reynolds number and was subsequently applied to other types of flow that are completely enclosed or that involve a moving object completely immersed in a fluid.
Reynolds number, in fluid mechanics, a criterion of whether fluid flow is absolutely Steady Cstreamlined, or laminar) or on the average steady with small unsteady fluctuations turbulent).
Whenever the Reynolds number is less than about 2000, flow in a Pipe is generally laminar, Whereas, at values greater than 2000, flow is usually turbulent. Actually, the transition between laminar and turbulent flow occurs hot at a specific value of the Reynolds number.
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