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An electrical heater 100 mm long and 5 mm in diameter is inserted into a hole drilled normal to the surface of a large block of material
An electrical current of 700 A flows through a stainless steel cable having a diameter of 5 mm and an electrical resistance of 6 X 10-4 ?/m
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 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
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, 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.