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A passive technique for cooling heat-dissipating integrated circuits involves submerging the ICs in a low boiling point dielectric fluid.
A pipe carrying superheated steam in a basement at 10°C has a surface temperature of 150°C. Heat loss from the pipe occurs by radiation
A plane wall (p = 4000 kg/m3, c p = 500 J/kg · K, k = 10 W/m · K) of thickness L = 20 mm initially has a linear, steady-state temperature distribution
A plane wall 15 cm thick has a thermal conductivity given by the relation k = 2.0 + 0.0005 T W/(m K) where T is in degrees Kelvin
A platen of thermal conductivity k = 15 W/m · K is heated by flow of a hot fluid through channels of width L = 20mm, with T8,i = 200°C and hi = 500W/m2 · K.
A plate of thickness 2L = 25 mm at a temperature of 600°C is removed from a hot pressing operation and must be cooled rapidly in order to achieve the required
A plane wall 7.5 cm thick, generates heat internally at the rate of 105 W/m3. One side of the wall is insulated, and the other side is exposed to an environment
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 pin fin of 10-mm diameter dissipates 30 W by forced convection to air in cross flow with a Reynolds number of 4000.
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 micro scale detector monitors a steady flow (T8 = 27°C, V = 10 m/s) of air for the possible presence of small hazardous particulate matter
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
Choose one of the major categories of applications of linear programming. Give an example of an application of the model.
A natural convection air heater consists of an array of parallel, equally spaced vertical plates, which may be maintained at a fixed temperature
A number of thin plates are to be cooled by vertically suspending them in a water bath at a temperature of 200C.
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 metal sphere of diameter D, which is at a uniform temperature Tj , is suddenly removed from a furnace and suspended from a fine wire in a large room
A long, hollow cylinder is constructed from a material whose thermal conductivity is a function of temperature according to k = 0.060 + 0.00060 T
A long wooden rod at 38°C with a 2.5 cm diameter is placed into an airstream at 600°C. The heat transfer coefficient between the rod and air
A long trapezoidal bar is subjected to uniform temperatures on two surfaces, while the remaining surfaces are well insulated