Questions from Thermal Fluid Science

Q: The local atmospheric pressure in Denver, Colorado (elevation 1610 m

The local atmospheric pressure in Denver, Colorado (elevation 1610 m), is 83.4 kPa. Air at this pressure and at 30°C flows with a velocity of 6 m/s over a 2.5-m × 8-m flat plate whose temperature is 1...

Q: Consider laminar natural convection from a vertical hot plate. Will the

Consider laminar natural convection from a vertical hot plate. Will the heat flux be higher at the top or at the bottom of the plate? Why?

Q: Warm air is blown over the inner surface of an automobile windshield

Warm air is blown over the inner surface of an automobile windshield to defrost ice accumulated on the outer surface of the windshield. Consider an automobile windshield (kw = 0.8 Btu/h⋅ft⋅R) with an...

Q: Under what conditions can the outer surface of a vertical cylinder be

Under what conditions can the outer surface of a vertical cylinder be treated as a vertical plate in natural convection calculations?

Q: The top surface of the passenger car of a train moving at

The top surface of the passenger car of a train moving at a velocity of 95 km/h is 2.8 m wide and 8 m long. The top surface is absorbing solar radiation at a rate of 380 W/m2, and the temperature of t...

Q: A 0.2-m-long and 25-mm

A 0.2-m-long and 25-mm-thick vertical plate (k = 15 W/m⋅K) separates the hot water from the cold water. The plate surface exposed to the hot water has a temperature of 100°...

Q: Consider the falling of a rock off a cliff into seawater,

Consider the falling of a rock off a cliff into seawater, and eventually settling at the bottom of the sea. Starting with the potential energy of the rock, identify the energy transfers and transforma...

Q: Reconsider Prob. 19–27. Using appropriate software, investigate

Reconsider Prob. 19–27. Using appropriate software, investigate the effects of the train velocity and the rate of absorption of solar radiation on the equilibrium temperature of the...

Q: Reconsider Prob. 20–15. Using appropriate software, investigate

Reconsider Prob. 20–15. Using appropriate software, investigate the effect of the plate thermal conductivity on the surface temperature exposed to the cold water. By varying the plat...

Q: Solar radiation is incident on the glass cover of a solar collector

Solar radiation is incident on the glass cover of a solar collector at a rate of 700 W/m2. The glass transmits 88 percent of the incident radiation and has an emissivity of 0.90. The entire hot water...