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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 cylindrical heater element of diameter D = 10 mm, temperature T1 = 1500 K, and emissivity e1 = 1 is used in a furnace.
A long pyroceram rod of diameter 20 mm is clad with a very thin metallic tube for mechanical protection.
A long rod of 20-mm diameter and a thermal conductivity of 1.5 W/m · K has a uniform internal volumetric thermal energy generation of 10 6 W/m3
A long steel beam with rectangular cross section of 40 cm by 60 cm is mounted on an insulating wall as shown in the sketch below the rod is heated by radiant
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 plastic rod of 30-mm diameter (k = 0.3 W/m · K and pcp = 1040kJ/m3 · K) is uniformly heated in an oven as preparation for a pressing operation
A long cylindrical rod, 8 cm in diameter, is initially at a uniform temperature of 20°C. At time t = 0, the rod is exposed to an ambient temperature
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, 1-mm-diameter wire passes an electrical current dissipating 3150 W 1m and reaches a surface temperature of 126°C when submerged
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 journal bearing may be idealized as a flat plate with another flat plate moving parallel to the first and the space between the two filled
A journal bearing has a clearance of 0.5 mm. The journal has a diameter of 100 mm and rotates at 3600 rpm within the bearing.
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.
A laboratory apparatus to measure the diffusion coefficient of vapor-gas mixtures consists of a vertical, small-diameter column containing the liquid phase
A laboratory experiment involves simultaneous heat and mass transfer from a water-soaked towel experiencing irradiation from a bank of radiant lamps
A large 2.54-cm.-thick copper plate is placed between two air streams. The heat transfer coefficient on the one side is 28 W/(m2 K) and on the other side
A large billet of steel initially at 260°C is placed in a radiant furnace where the surface temperature is held at 1200°C
A laser-materials-processing apparatus encloses a sample in the form of a disk of diameter D = 25 mm and thickness w = 1 mm.