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Air at a static temperature of 70°F and a static pressure of 0.1 psia flows at zero angle of attack over a thin electrically heated flat plate at a velocity
Air at 27°C and a velocity of 5 m/s passes over the small region As (20 mm x 20 mm) on a large surface, which is maintained at Ts = 127°C.
Air at 25°C flows at 30 x 10-6 kg/s within 100-mm-long channels used to cool a high thermal conductivity metal mold
Air at 20°C flows at 1 m/s between two parallel flat plates spaced 5 cm apart. Estimate the distance from the entrance where the hydrodynamic boundary layers
An air heater consists of a steel tube (k = 20 W/m · K), with inner and outer radii of r( = 13 mm and r2 = 16 mm, respectively, and eight integrally machined
An air duct heater consists of an aligned array of electrical heating elements in which the longitudinal and transverse pitches are SL = ST = 24 mm.
Air at 300 K and a flow rate of 3 kg/h passes upward through a 30-mm tube, as shown in the sketch. A thin film of water, also at 300 K, slowly falls
Air at 3 atm and 100°C is discharged from a compressor into a vertical receiver of 2.5-m height and 0.75-m diameter
Air at 27°C with a free stream velocity of 10 m/s is used to cool electronic devices mounted on a printed circuit board. Each device, 4 mm by 4 mm
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