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Consider a thin, 50 mm X 50 mm fuel cell similar to that of Example 1.5, with air in parallel flow over its surfaces. Very small-diameter wires are stretched across both sides of the fuel cell at a distance x =xc from the leading edge in order to trip the flow into tur- bulent conditions. Using an appropriate correlation from Chapter 7, determine the minimum velocity needed to sustain the fuel cell at Tc = 77°C, and the associated location of the wire. The air and large sur- roundings are at Too = Tsur = 27°C and the fuel cell dissipates Eg = 11 W. The fuel cell emissivity is s = 0.85.
a 6 nominal pipe size schedule 40 steel pipe has a chamfered entrance and 300 ft. long. the velocity is 20 ft per sec.
Compute the local convection coefficient at the leading and trailing edges of the heated plate with and without an unheated starting length of t = 1 m. Compute the average convection coefficient for the plate for the same conditions as part (a).
a pipe in a manufacturing plant is transporting superheated vapor at a mass flow rate of 0.3 kgs. the pipe is 10 m long
a liquid mixture of 30 mole benzene b 25 mole toluene t 45 mole xylene x is fed to a distillation column. the bottoms
why is the correct tightening of friction grip bolts important?
bananas are to be cooled from 24degc to 13degc at a rate of 215 kgh by a refrigeration system. the power input to the
an insulated piston-cylinder device contains 5l of saturated liquid water at a constant pressure of 175kpa. water is
a 9 meter diameter balloon filled with helium carries a 100 kg person.the force that will push the balloon up is f p
what is the effect of quenching on the transition temperature and toughness for the mild steel ?
the diffusion constant do and activation energy q of c in bcc fe is 0.01 cm2sec and 80kjmol respectively. in fcc fe the
A spring stiffness k= 500 n/m is mounted against a 10 kg block. if the block is subjected to a force of 1 KN determine the velocity of the block at s=0.3 m when s=0, the block is at rest and the spring is uncompressed. The coefficient of fricktion is..
calculate the resistance of a platinum wire that is 2 m in lenth and has a diameter of 0.1cm. the resistivity of
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