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1. Oxygen gas is maintained at pressures of 2 bars and 1 bar on opposite sides of a rubber membrane that is 0.5 mm thick, and the entire system is at 25°C. What is the molar diffusive flux of O2 through the mem- brane? What are the molar concentrations of O2 on both sides of the membrane (outside the rubber)?
2. Insulation degrades (experiences an increase in thermal conductivity) if it is subjected to water vapor condensa- tion. The problem may occur in home insulation during cold periods, when vapor in a humidified room diffuses through the drywall (plaster board) and condenses in the adjoining insulation. Estimate the mass diffusion rate for a 3 m X 5 m wall, under conditions for which the vapor pressure is 0.03 bar in the room air and 0.0 bar in the insulation. The drywall is 10 mm thick, and the solubility of water vapor in the wall material is approximately 5 X 10-3 kmol/m3 · bar. The binary diffusion coefficient for water vapor in the drywall is approximately 10-9 m2/s.
the overall volume compression ratio of a reversed carnot cycle working with air as a refrigerant is 10. the
A 1.00%wt Carbon steel (FCC or \gamma?Fe) axel must operate at 850C in an oxidizing environment where the carbon content at the surface of the steel is zero. Only the outermost 200 microns of the component can fall below 0.50%wt C.
the 10-kg mass a is moving at 5 ms when it is 1 m from the stsaionary 10 kg mass b. the coefficiient of kinetic
1000 ft3min of air at 50 degrees fahrenheit dry-bulb and 95 relative humidity are mixed with 1500 ft3min of air at 76
Based on the average, logarithmic energy loss per collision, approximately how many collisions must a neutron make with Fe-56 to slow from an energy of 1 MeV to 1 eV?
oil enters a counterflow heat exchanger at 450k with a mass flow rate of 10 kgs and exits at 350k. a seperate stream of
a turbofan jet engine has a large fan that sucks in air. some of this air enters a set of compressors is mixed with
a horizontal pipeline is designed for a given e epsilon l q flow rate density viscosity and change in pressure and the
A flow idealized as a throttling process through a device has
the inner and outer surfaces temperatures of a 0.5-cm thick 2-m x 2-m window glass in winter are 100c and 30c
find a unique four-bar mechanism one that was not mentioned in class like the vise grips. sketch the mechanism and
A piston-cylinder assembly contains saturated water vapor at T = 200C. The surrounding air is at 35C. Heat transfer occurs from the system until the cylinder contains saturated liquid water at T = 200C. Can this process be modeled as a reversible pro..
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