A fluid of density `1200 (kg)/m^3` and viscosity `0.5 `poise is flowing at a rate of `5m^3/( min)` in a circular pipe of cross-section of `1 m^2`. Is flow laminar or turbulent? Can you predict maximum velocity of fluid in pipe ?

A fluid of viscosity `8 `poise and specific gravity `1.2` is flowing through a circular pipe of diameter ` 100 `mm. The maximum shear stress at the pipe wall is `210 N/m^2`. Find:

1.  The pressure gradient,
2.  The average velocity, and
3. Reynolds number of flow.

A lubricating oil of viscosity 1 poise and specific gravity 0.9 is pumped through 

a 30 mm diameter pipe. If the pressure drop per metre length of pipe is `20( kN)/m^2`, determine:

1. The mass flow rate in kg/min,
2.  The shear stress at the pipe wall,
3.  The Reynolds number of flow, and 
4. The power required per 50 m length of the pipe to maintain the flow.