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An enclosure contains an array of circuit boards, 15 cm high and 20 cm long. The clearance between the tips of the components on the PCB and the back surface of the adjacent PCB is 0.3 cm. Each circuit board contains 75 square chips on one side, each dissipating 0.15 W of power. Air enters the space between the boards through the 0.3-cm x 15-cm cross section at 40°C with a velocity of 300 m/min. Assuming the heat transfer from the back side of the circuit board to be negligible, determine the exit temperature of the air and the highest surface temperature of the chips.
Consider a large plane wall of thickness L = 0.3 m, thermal conductivity k = 2.5 W/m-K, and surface area A = 12.0 m2. The left side of the wall at x = 0 is subjected to a net heat flux q” = 700 W/m2 while the temperature at the surface is measured to..
a closed cylindrical storage tank contains gas under pressure p and has an inner diameter of 24 in. and a wall
The pressure in a tire depends on the temperature of the air in the tire. The gage pressure of an automobile tire with a volume of 0.025 m3 is measured to be 210 kPa at 25 oC at sea level on a day with calm weather. If the temperature of the air in t..
a four-cylinder spark ignition engine has a compression ratio of 8 and each cylinder has a maximum volume of 0.6l. at
a boiler is fed with a distillate fuel oil of composition c9h16o2n0.03. combustion occurs with 20 excess air. assume
if f1 110n f2 121n and f3 85n determine the magnitude and coordinate direction angles of the resultant couple
a mixture that is 15 percent carbon dioxide 5 percent carbon monoxide 10 percent oxygen and 70 percent nitrogen by
steam enters a well-insulated turbine operating at steady state at p14mpa t1320c and a velocity v110ms. the steam
Sketch carefully T-s diagrams for Otto and Brayton cycles on the basis of a logarithmic scale for T and a linear scale for s. What are the slopes of the constant pressure heating processes (Brayton) and the constant volume heating processes (Otto) on..
an adiabatic compressor compresses air from atmospheric pressure and 70 degf at a rate of 10000 acfm actual cubic feet
Determine (a) the velocity of the air at the duct inlet and (b) the temperature of the air at the exit.
why do we not take into account the normal forces or the frictional forces acting on the jumper when determining the
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