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Helium gas is stored at 100*C under a pressure of 5x10^5 Pa in a glass cylinder 20 cm in diameter and 15cm long. The glass walls are 5 mm thick. Overtime the Helium will gradually diffuse out of the cylinder. (The diffusion coefficient of He through oxide glass at 100*C is about 7x10^-4 m2/s and the concentration of He on the inner surface is about 2.2x10^-3 kmol/m3).
a) Sketch the concentration profile of helium gas through the thickness of the cylinder walls.
b) What is the initial rate of mass loss through the cylinder? Hint: Remember to include the flux through the top and bottom surfaces.
A new cast iron pipe is 5 km long and 15 mm diameter is used to convey water at a rate of 0.0150m3s-1. Given the absolute roughness of the pipe is 0.26 mm, density of water is 998 kg/m3 and dynamic viscosity of water is 1.14 × 10-3 kgm 1s-1.
an un-stretched spring initially is attached to a horizontal piston round shape. heat is added to the gas until the
blocks a and b weigh 25 lb and 10 lb respectively and they are both at a height 6 ft above the ground when the system
a 0.2 m3 tank containing helium at bar and 22 c will be used to supply 4.5 moles per minute of helium at atmospheric
an accident at a nuclear power plant causes the main valves to close and stop the main water flow that cools the
a piston-cylinder device containing water undergoes a thermodynamic cycle consisting of the following three
i want a unique version of this
consider an air-water heat exchanger. air flowing steadily at the rate of 0.5 kgs enters the heat exchanger at 100 kpa
one mole of an ideal gas at t 25 degc is held in a cylinder by a piston at a pressure of 1 x 107 n m-2. the piston
Use cold air properties to find the highest cycle pressure, the specific energy added by combustion, and the mean effective pressure.
a room has walls and a ceiling that conduct heat from the room to the cooler outdoors. if the inside temperature is
a feeder heater extracts steam from a turbine at 600kpa and 250c which it combines with 0.3 kgs of liquid at 600 kpa
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