Questions from Thermal Fluid Science

Q: Air at 25°C and 1 atm is flowing over a

Air at 25°C and 1 atm is flowing over a long flat plate with a velocity of 8 m/s. Determine the distance from the leading edge of the plate where the flow becomes turbulent, and the thickness of the b...

Q: Repeat Prob. 15–48 for water. Data

Repeat Prob. 15–48 for water. Data from Prob. 15-48: Air at 25°C and 1 atm is flowing over a long flat plate with a velocity of 8 m/s. Determine the distance from the leading edge of the plate where...

Q: Define the planform area of a body subjected to external flow.

Define the planform area of a body subjected to external flow. When is it appropriate to use the planform area in drag and lift calculations?

Q: The weight of a thin flat plate 50 cm × 50 cm

The weight of a thin flat plate 50 cm × 50 cm in size is balanced by a counterweight that has a mass of 2 kg, as shown in Fig. P15–50. Now a fan is turned on, and air at...

Q: The forming section of a plastics plant puts out a continuous sheet

The forming section of a plastics plant puts out a continuous sheet of plastic that is 1.2 m wide and 2 mm thick at a rate of 18 m/min. The sheet is subjected to airflow at a velocity of 4 m/s on both...

Q: In flow over bluff bodies such as a cylinder, how does

In flow over bluff bodies such as a cylinder, how does the pressure drag differ from the friction drag?

Q: Why is flow separation in flow over cylinders delayed when the boundary

Why is flow separation in flow over cylinders delayed when the boundary layer is turbulent?

Q: In flow over cylinders, why does the drag coefficient suddenly drop

In flow over cylinders, why does the drag coefficient suddenly drop when the boundary layer becomes turbulent? Isn’t turbulence supposed to increase the drag coefficient instead of decreasing it?

Q: A 5-mm-diameter electrical transmission line is exposed to

A 5-mm-diameter electrical transmission line is exposed to windy air. Determine the drag force exerted on a 160-m-long section of the wire during a windy day when the air is at 1 atm and 15°C and the...

Q: A vertical piston–cylinder device contains water and is being heated

A vertical piston–cylinder device contains water and is being heated on top of a range. During the process, 65 Btu of heat is transferred to the water, and heat losses from the side walls amount to 8...