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A fuel cell [59] consists of air (or oxygen) and hydrogen micro ducts, separated by a membrane that promotes proton exchange for an electric current, as in Fig. P6.96. Suppose that the air side, at 20°C and approximately 1 atm, has five 1 mm by 1 mm ducts, each 1 m long. The total flow rate is 1.5E-4 kg/s.
(a) Determine if the flow is laminar or turbulent..
(b) Estimate the pressure drop. (Problem courtesy of Dr. Pezhman Shirvanian.)
What information has to be obtained in order to ensure that the method will be a satisfactory one and determine changes in composition of a fluid. Define what is meant by refractive index, and give the relationship between the incident and refracte..
a simple ideal rankine cycle which uses water as the working fluid operates it condenser at 40 degrees celsius and its
it is fair to assume that the heat rejection from an otto cycle is typically to the ambient at a temperature tmin the
consider a carnot-cycle refrigerator with ammonia as the working fluid. heat is rejected from the ammonia at 20 deg c
a smoking lounge is to accommodate 15 heavy smokers. the minimum fresh air requirement for smoking lounges is specified
a mass of 100 slug is towed by 2 ropes one rope pulls with a force of 200 lbf at 30 degrees to the left of the centar
A 17-tooth 20 normal pressure-angle helical pinion with a right-hand helix angle of 30 rotates at 1800 rev/min when transmitting 4 hp to a 52-tooth helical gear. The normal diametrical pitch is 10 teeth/in, the face width is 1.5 in, and the set has a..
a 5 kw pump operating at steady state receives liquid water at 100 kpa 15 c and delivers it to a point 6 m above the
List three different factors responsible for the increase in pressure resulting from the transfer of heat to the tank. List ways in which this accident could have been avoided.
a 40 foot long aluminum street lighting support is sized and welded into position between two very large bridge beams
the inclined-tube manometer has d 76 mm and d 8 mm and is filled with meriam red oil. compute the angle that will
At steady state, air at 200 kPa, 325 K, and mass flow rate of 0.5 kg/s enters an insulated duct having differing inlet and exit cross sectional areas. The inlet cross sectional area is 6 cm squared. At the duct exit, the pressure of the air is 100 kP..
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