Questions from Thermal Fluid Science

Q: Define equivalent length for minor loss in pipe flow. How is

Define equivalent length for minor loss in pipe flow. How is it related to the minor loss coefficient?

Q: Show that the Reynolds number for flow in a circular pipe of

Show that the Reynolds number for flow in a circular pipe of diameter D can be expressed as Re = 4m/(πDμ).

Q: The effect of rounding of a pipe exit on the loss coefficient

The effect of rounding of a pipe exit on the loss coefficient is (a) negligible, (b) somewhat significant, or (c) very significant.

Q: Which has a greater minor loss coefficient during pipe flow: gradual

Which has a greater minor loss coefficient during pipe flow: gradual expansion or gradual contraction? Why?

Q: A piping system involves sharp turns, and thus large minor head

A piping system involves sharp turns, and thus large minor head losses. One way of reducing the head loss is to replace the sharp turns with circular elbows. What is another way?

Q: During a retrofitting project of a fluid flow system to reduce the

During a retrofitting project of a fluid flow system to reduce the pumping power, it is proposed to install vanes into the miter elbows or to replace the sharp turns in 90° miter elbows by smooth curv...

Q: A horizontal pipe has an abrupt expansion from D1 = 5 cm

A horizontal pipe has an abrupt expansion from D1 = 5 cm to D2 = 10 cm. The water velocity in the smaller section is 8 m/s and the flow is turbulent. The pressure in the smaller section is P1 = 410...

Q: Consider flow from a water reservoir through a circular hole of diameter

Consider flow from a water reservoir through a circular hole of diameter D at the side wall at a vertical distance H from the free surface. The flow rate through an actual hole with a sharp-edged entr...

Q: The engine of a 1500-kg automobile has a power rating

The engine of a 1500-kg automobile has a power rating of 75 kW. Determine the time required to accelerate this car from rest to a speed of 100 km/h at full power on a level road. Is your answer realis...

Q: Repeat Prob. 14–55 for a slightly rounded entrance (

Repeat Prob. 14–55 for a slightly rounded entrance (KL = 0.12). Data from Prob. 14-55: Consider flow from a water reservoir through a circular hole of diameter D at the side wall at...