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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.
Discuss five factors which you are going to consider before making a decision whether to accept or reject the offer and Prepare an organization structure
a pressure relief valve contains a poppet with a 4.20 cm2 area on which system pressure acts. during assembly a spring
a floating cone with tip angle 60 degrees has. mass of m1300kg is placed in sea water with density rho 1025kgm3. on top
you have been hired to develop a package transfer slide for a global company. the slide has length l. the slide is to
Derive an analytical expression for the temperature distribution along the length of the rod and for various time values.
although ripening of tomatoes can be retarded by low temperatures storage under refrigeration can cause chilling injury
the acceleration due to gravity at sea level is g 9.81 ms2 . what is the persons weight at sea level? the acceleration
an orifice meter is installed in a 12 foot ductile iron pipe carrying water at 60 deg f. a mercury manometer is used to
Calculate the ultimate tensile strength (engineering) of a material whose strength coefficient is 700 MPa and a tensile test specimen which necks at an engineering tensile strain of 0.35.
when the air temperature in an automobile tire is 25oc the pressure gage reads 210 kpa. if the air volume in the tire
Plot the engineering stress-strain curve. Determine i. Young's modulus, ii. the 0.2% offset yield strength, iii. the tensile strength, iv. the percent elongation, and v. the percent reduction of area.
A fluid flow axially in the annular region between two concentric pipes with radii R1 and R2>R1, respectively. Assume the flow is steady, incompressible, axisymmetric, fully-developed, and has no swirl. Also neglect all body forces.
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