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Air at a free stream temperature of T8 = 20°C is in parallel flow over a flat plate of length L = 5 m and temperature Ts = 90°C
Air at 4 x 10-4 kg/s and 27°C enters a triangular duct that is 20 mm on a side and 2 m long. The duct surface is maintained at 100°C.
Air at 3 x 10-4 kg/s and 27°C enters a rectangular duct that is I m long and 4 mm by 16 mm on a side. A uniform heat flux of 600 W/m2 is imposed on the duct
Air at 25°C flows over a 10-mm-diameter sphere with a velocity of 25 m/s, while the surface of the sphere is maintained at 75°C
Air at 200 kPa enters a 2-m-Iong, thin-walled tube of 25-mm diameter at 150°C and 6 m/s Steam at 20 bars condenses on the outer surface.
Aluminum fins of triangular profile are attached to a plane wall whose surface temperature is 250°C. The fin base thickness is 2 mm, and its length is 6 mm.
Airflow through a long, O.2-m-square air conditioning duct maintains the outer duct surface temperature at 10°C.
Air flowing through a tube of 75-mm diameter passes over a 150-mm-Iong roughened section that is constructed from naphthalene having the properties
Air at a pressure of 1 atm and a temperature of 50°C is in parallel flow over the top surface of a flat plate that is heated to a uniform temperature of 100°C.
A two-dimensional rectangular plate is subjected to the boundary conditions shown. Derive an expression for the steady-state temperature distribution T(x, y).
A vertical array of circuit boards is immersed in quiescent ambient air at T8 = 17°C. Although the components protrude from their substrates
A vertical array of circuit boards of 150-mm height is to be air cooled such that the board temperature does not exceed 60°C
A vertical, double-pane window, which is I m on a side and has a 25-mm gap filled with atmospheric air, separates quiescent room air at T8,o = 20°C
A vertical, thin pane of window glass that is 1 m on a side separates quiescent room air at T8,i = 20°C from quiescent ambient air at T8.o = - 20°C.
According to its directional distribution, solar radiation incident on the earth's surface may be divided into two components.
A wet towel hangs on a clothes line under conditions for which one surface receives solar irradiation of GS = 900 W/m 2 and both surfaces are exposed
A water bath is used to maintain canisters containing experimental biological reactions at a uniform temperature of 37°C.
A warehouse is to be designed for keeping perishable foods cool prior to transportation to grocery stores
A very long rod of 5-mm diameter and uniform thermal conductivity k = 25 W/m. K is subjected to a heat treatment process
A wall 0.12 m thick having a thermal diffusivity of 1.5 x 10-6 m2/s is initially at a uniform temperature of 85°C.
A very thick slab with thermal diffusivity 5.6 x 10-6 m2/s and thermal conductivity 20 W/m · K is initially at a uniform temperature of 325°C.
A vertical steel tube carries water at a pressure of 10 bars. Saturated liquid water is pumped into the D = 0.1 m diameter tube at its bottom end (x = 0)
A vertical plate 500 mm high and 200 mm wide is to be used to condense saturated steam at 1 atm
A vertical plate 2.5 m high, maintained at a uniform temperature of 54°C, is exposed to saturated steam at atmospheric pressure.
Air at 10 m/s and 15°C is used to cool a square hot molded plastic plate 0.5 m to a side having a surface temperature of 140°C.