Questions from Thermal Fluid Science

Q: Consider heat transfer through a windowless wall of a house on a

Consider heat transfer through a windowless wall of a house on a winter day. Discuss the parameters that affect the rate of heat conduction through the wall.

Q: A plastic boat whose bottom surface can be approximated as a 1

A plastic boat whose bottom surface can be approximated as a 1.5-m-wide, 2-m-long flat surface is to move through water at 15°C at speeds up to 45 km/h. Determine the friction drag exerted...

Q: Consider heat loss through two walls of a house on a winter

Consider heat loss through two walls of a house on a winter night. The walls are identical except that one of them has a tightly fitted glass window. Through which wall will the house lose more heat?...

Q: Consider a room that is initially at the outdoor temperature of 20

Consider a room that is initially at the outdoor temperature of 20°C. The room contains a 40-W lightbulb, a 110-W TV set, a 300-W refrigerator, and a 1200-W iron. Assuming no heat transfer through the...

Q: Reconsider Prob. 15–87. Using appropriate software, investigate

Reconsider Prob. 15–87. Using appropriate software, investigate the effect of boat speed on the drag force acting on the bottom surface of the boat, and the power needed to overcome...

Q: Stokes’ law can be used to determine the viscosity of a fluid

Stokes’ law can be used to determine the viscosity of a fluid by dropping a spherical object in it and measuring the terminal velocity of the object in that fluid. This can be done b...

Q: Consider two houses that are identical except that the walls are built

Consider two houses that are identical except that the walls are built using bricks in one house and wood in the other. If the walls of the brick house are twice as thick, which house do you think wil...

Q: During flow over a given body, the drag force, the

During flow over a given body, the drag force, the upstream velocity, and the fluid density are measured. Explain how you would determine the drag coefficient. What area would you use in the calculati...

Q: Consider two walls of a house that are identical except that one

Consider two walls of a house that are identical except that one is made of 10-cm-thick wood while the other is made of 25-cm-thick brick. Through which wall will the house lose more heat in winter?

Q: The passenger compartment of a minivan traveling at 50 mi/h

The passenger compartment of a minivan traveling at 50 mi/h in ambient air at 1 atm and 80°F is modeled as a 4.5-ft high, 6-ft-wide, and 11-ft-long rectangular box. The airflow over the ext...