Questions from Thermal Fluid Science

Q: How does the wall shear stress τw vary along the flow direction

How does the wall shear stress τw vary along the flow direction in the fully developed region in (a) laminar flow and (b) turbulent flow?

Q: How is the friction factor for flow in a pipe related to

How is the friction factor for flow in a pipe related to the pressure loss? How is the pressure loss related to the pumping power requirement for a given mass flow rate?

Q: Discuss whether fully developed pipe flow is one-, two-, or

Discuss whether fully developed pipe flow is one-, two-, or three-dimensional.

Q: Determine the torque applied to the shaft of a car that transmits

Determine the torque applied to the shaft of a car that transmits 225 hp and rotates at a rate of 3000 rpm.

Q: Why are liquids usually transported in circular pipes?

Why are liquids usually transported in circular pipes?

Q: Consider fully developed flow in a circular pipe with negligible entrance effects

Consider fully developed flow in a circular pipe with negligible entrance effects. If the length of the pipe is doubled, the head loss will (a) double, (b) more than double, (c) less than double, (d)...

Q: Consider fully developed laminar flow in a circular pipe. If the

Consider fully developed laminar flow in a circular pipe. If the diameter of the pipe is reduced by half while the flow rate and the pipe length are held constant, the head loss will (a) double, (b) t...

Q: Explain why the friction factor is independent of the Reynolds number at

Explain why the friction factor is independent of the Reynolds number at very large Reynolds numbers.

Q: Consider laminar flow of air in a circular pipe with perfectly smooth

Consider laminar flow of air in a circular pipe with perfectly smooth surfaces. Do you think the friction factor for this flow is zero? Explain.

Q: Consider fully developed laminar flow in a circular pipe. If the

Consider fully developed laminar flow in a circular pipe. If the viscosity of the fluid is reduced by half by heating while the flow rate is held constant, how does the head loss change?