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A plane wall of thickness 0.1 m and thermal conductivity 25 W/m · K having uniform volumetric heat generation of 0.3 MW/m3 is insulated on one side
A pipeline, used for the transport of crude oil, is buried in the earth such that its centerline is a distance of 1.5 m below the surface
A major problem in packaging very large-scale integrated (VLSI) circuits concerns cooling of the circuit elements
A metal rod of length 2L, diameter D, and thermal conductivity k is inserted into a perfectly insulating wall, exposing one-half of its length to an air stream
A molded plastic product (p = 1200 kg/m3 · c = 1500 J/kg · K, k = 0.30 W/m · K) is cooled by exposing one surface to an array of air jets
A motor draws electric power Pelec from a supply line and delivers mechanical power Pmech to a pump through a rotating copper shaft of thermal conductivity
A natural convection air heater consists of an array of parallel, equally spaced vertical plates, which may be maintained at a fixed temperature
A nuclear reactor fuel element consists of a solid cylindrical pin of radius r1 and thermal conductivity kf.
A minivan traveling 90 km/h has just passed through a thunderstorm that left a film of water 0.1 mm thick on the top of the van.
A microwave oven operates on the principle that application of high-frequency field causes electrically polarized molecules in food to oscillate
A long trapezoidal bar is subjected to uniform temperatures on two surfaces, while the remaining surfaces are well insulated
A one wire of diameter D is positioned across a passage to determine flow velocity from heat transfer characteristics. Current is passed through the wire
A long wire of diameter D = 1 mm is submerged in an oil bath of temperature T8 = 25°C. The wire has an electrical resistance per unit length of R
A long pyroceram rod of diameter 20 mm is clad with a very thin metallic tube for mechanical protection.
A long power transmission cable is buried at a depth (ground to cable centerline distance) of 2 m. The cable is encased in a thin-walled pipe of 0.1-m diameter
A long cylindrical rod of diameter 200 mm with thermal conductivity of 0.5 W/m. K experiences uniform volumetric heat generation of 24,000 W/m3.
A long rod 40 mm in diameter, fabricated from sapphire (aluminum oxide) and initially at a uniform temperature of 800 K, is suddenly cooled by a fluid
A long, cylindrical, electrical heating element of diameter D = 10 mm, thermal conductivity k = 240 W/m · K, density p = 2700 kg/m3
A long, circular aluminum rod is attached at one end to a heated wall and transfers heat by convection to a cold fluid.
A long rod of 60-mm diameter and thermo physical properties P = 8000 kg/m3, c = 500 J/kg · K, and k = 50 W/m · K is initially at a uniform temperature
If air exits the nozzles at a temperature of 400 K and a velocity of 30 m/s, what is the initial cooling rate of the plate?
A long, uninsulated steam line with a diameter of 89 mm and a surface emissivity of 0.8 transports steam at 200°C and is exposed to atmospheric air
A hot fluid passes through circular channels of a cast iron platen (A) of thickness LA = 30 mm which is in poor contact with the cover plates
A hot fluid passes through a thin-walled tube of 10-mm diameter and 1-m length and a coolant at T8 = 25°C is in cross flow over the tube.
Assume that we've taken a radiograph of a small circular plastic object from which we have made the following relative exposure measurements