Questions from Principles Of Heat Transfer

Q: A scale model of an airplane wing section is tested in a

A scale model of an airplane wing section is tested in a wind tunnel at a Mach number of 1.5. The air pressure and temperature in the test section are 20,000 N/m2 and -30°C, respectively. If the wing...

Q: The dimensionless ratio / called the Froude number, is a measure

The dimensionless ratio / called the Froude number, is a measure of similarity between an ocean- going ship and a scale model of the ship to be tested in a laboratory water channel. A 150-m-long cargo...

Q: When a sphere falls freely through a homogeneous fluid, it reaches

When a sphere falls freely through a homogeneous fluid, it reaches a terminal velocity at which the weight of the sphere is balanced by the buoyant force and the frictional resistance of the fluid....

Q: Determine the heat transfer coefficient at the stagnation point and the average

Determine the heat transfer coefficient at the stagnation point and the average value of the heat transfer coefficient for a single 5-cm-OD, 60-cm-long tube in cross-flow. The temperature of the tube...

Q: Repeat Problem 6.9 if the extrusion cross-section is

Repeat Problem 6.9 if the extrusion cross-section is elliptical with the major axis normal to the air flow and the same mass per unit length. The major axis of the elliptical cross section is 5.46 cm,...

Q: A long wire 0.7 mm in diameter with an emissivity

A long wire 0.7 mm in diameter with an emissivity of 0.9 is placed in a large quiescent air space at 270 K. If the wire is at 800 K, calculate the net rate of heat loss. Discuss your assumptions.

Q: The human body is typically modelled as a vertical cylinder that is

The human body is typically modelled as a vertical cylinder that is 1.8 m high and is 30 cm in diameter, as shown in the figure. Calculate the average rate of heat loss from this body, which is mainta...

Q: A nuclear reactor fuel rod is a circular cylinder 6 cm in

A nuclear reactor fuel rod is a circular cylinder 6 cm in diameter. The rod is to be tested by cooling it with a flow of sodium at 205°C with a velocity of 5 cm/s perpendicular to its axis. If the rod...

Q: A stainless steel pin fin 5 cm long and with a 6

A stainless steel pin fin 5 cm long and with a 6-mm OD, extends from a flat plate into a 175 m/s air- stream, as shown in the sketch. Estimate (a) the aver- age heat transfer coefficient between air...

Q: Repeat Problem 6.13 with glycerol at 20°C flowing

Repeat Problem 6.13 with glycerol at 20°C flowing over the fin at 2 m/s. The plate temperature is 50°C.