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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.
a small steam power plant has a boiler exit of 3 mpa 400degc while it maintains 50 kpa in the condenser. all the
it is desired to put oil hole through a part subjected to a stress field given by sigma xx 15 ksi sigma yy -15 ksi
a company is interested in hiring you to build something for their use. they want to make a cyclotron that will
The system is at rest in the position shown, with the 12-lb collar A resting on the spring (k = 20 lb/ft), when a constant 30-lb force is applied to the cable. What is the velocity of the collar when it has risen 1 ft? The collar is attached to th..
the steady-state creep rates at 473 k for any alloy are 2.510-3 h-1 at 55 mpa and 2.410-2 h-1 at 69 mpa. the activation
the wheel on a boat trailer has an angular speed of 1400 rpm when the trailer is towed at 90 kmhr. calculate the
you have been assigned to investigate a traffic accident. the masses of car a and car b are 1400kg and 1000 kg
a hot-water stream at 80 degrees c enters a mixing chamber with a mass flow rate of 0.5 kgs where it is mixed with a
an insulation system is to be selected for a furnace wall at l000degc using first a layer of mineral wool blocks
The diameter of the tube is 13 cm and its length is 60 m. Determine the overall heat transfer coefficient of this heat exchanger using (a) LMTD and (b) -NTU method.
suppose that the us military is considering a new lifetime regulation on their helicopter rotor blades. instead of
consider the annular triangular fin fabricated from an alloyed aluminumk180 wmk of lenght l10mm tickness t1mm. the base
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