Questions from Principles Of Heat Transfer

Q: The wing of an airplane has a polished aluminum skin. At

The wing of an airplane has a polished aluminum skin. At a 1500 m altitude, it absorbs 100 W/m2 by solar radiation. Assuming that the interior surface of the wing’s skin is well insu...

Q: A spherical interplanetary probe with a 30-cm diameter contains electronic

A spherical interplanetary probe with a 30-cm diameter contains electronic equipment that dissipates 100 W. If the probe surface has an emissivity of 0.8, what is its surface temperature in outer spac...

Q: It has been proposed to tow icebergs from the polar region to

It has been proposed to tow icebergs from the polar region to the Middle East in order to supply potable water to arid regions there. A typical iceberg suitable for towing should be relatively broad a...

Q: A thin, flat plate 15 cm square is tested for drag

A thin, flat plate 15 cm square is tested for drag in a wind tunnel with air at 30 m/s, 100 kPa (abs), and 16°C flowing across and parallel to the top and bottom surfaces. The observed total drag forc...

Q: Evaluate the dimensionless groups /and / for water, n-

Evaluate the dimensionless groups /and / for water, n-butyl alcohol, mercury, hydro- gen, air, and saturated steam at a temperature of 100°C.

Q: A thin, flatplate 15-cm square is suspended from a

A thin, flatplate 15-cm square is suspended from a balance in a uniformly flowing stream of engine oil in such a way that the oil flows parallel to and along both surfaces of the plate. The total drag...

Q: For a study on global warming, an electronic instrument has to

For a study on global warming, an electronic instrument has to be designed to map the CO2 absorption characteristics of the Pacific Ocean. The instrument package resembles a flat plate with a total (u...

Q: For flow of gas over a flat surface that has been artificially

For flow of gas over a flat surface that has been artificially roughened by sandblasting, the local heat transfer by convection is correlated by the dimensionless relation / (a) Derive a relationship...

Q: Repeat Problem 5.40, but consider the 2.5

Repeat Problem 5.40, but consider the 2.5-mm thick stainless steel strip to emerge from the rolling mill with a speed of 35 m/s. With the temperature of the strip and the surrounding air, respectively...

Q: Hydrogen at 15°C and a pressure of 100 kPa is

Hydrogen at 15°C and a pressure of 100 kPa is flowing along a flat plate at a velocity of 3 m/s. If the plate is 0.3 m wide and at 71°C, calculate the following quantities at x = 0.3 m and at the dist...