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14.40 A large sheet of material 40 mm thick contains dis- solved hydrogen (H2) having a uniform concentration of 3 kmol/m3. The sheet is exposed to a fluid stream that causes the concentration of the dissolved hydrogen to be reduced suddenly to zero at both surfaces. This surface condition is maintained constant thereafter. If the mass diffusivity of hydrogen is 9 X 10-7 m2/s, how much time is required to bring the density of dissolved hydrogen to a value of 1.2 kg/m3 at the center of the sheet?
2 forces are acting -20 and 20 ft away from the origin. each force is 1000 lbf and they are acting 60 degrees from the
a heat engine is composed of of a monatomic ideal gas which runs in the following cycle at point a the pressure is 2.6
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Water vapor at 100 lbf/in^2, 500 degrees F and a velocity of 100 ft/s enters a nozzle operating at steady state and expands adiabatically to the exit, where the pressure is 40 lbf/in^2. If the isentropic nozzle efficiency is 95%, determine for the no..
At steady state, air at 200 kPa, 528C and a mass flow rate of 0.5 kg/s enters an insulated duct having differing inlet and exit cross-sectional areas. At the duct exit, the pressure of the air is 100 kPa, the velocity is 255 m/s, and the cross-sec..
a pistoncylinder contains water with quality 75 at 200 kpa. slow expansion is performed while there is heat transfer
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calculate the critical radius for a nickel embryo nucleus that is undercooled 150 degrees c. the melting point of ni
a late-model hummer has a frontal profile area of 3.1 m2 and a cd of 0.47. it is moving at a steady speed of 75 mph. a
If the bottom surface is colder than the top surface, what is the nature of conditions within the container? For example, will there be vertical gradients of the species (O2 and N2) concentrations? Is there any motion of the air? Does mass transfe..
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