3.2

Define and calculate Reynolds number and relate this to the

physical properties of the flow

1. Consider a fluid flowing in a pipe. Describe how increasing each

of the quantities would affect Reynolds number.

A. Diameter of pipe

B. Flow velocity

C. Density of fluid

D. Dynamic viscosity of fluid

2. Describe the physical properties of the fluid flow at lower

Reynolds numbers (below 2300) and explain how the

characteristics of the flow would change if the velocity increased

and the Reynolds number increased to 5000.

3. Oil is flowing in a pipe, the density of the oil is 860kgm The

dynamic viscosity is 0.28 Pa/s, the pipe diameter is 0.06m and

the flow velocity is 35m/s. Is this laminar, transitional or

turbulent flow?