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A large sheet of material 40 mm thick contains dissolved hydrogen (H2) having a uniform concentration...
A large sheet of material 40 mm thick contains dissolved 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 suddenly reduced to zero at both surfaces. This surface condition is maintained constant thereafter. If the mass diffusivity of hydrogen is 9 × 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?
Solutions
Amanda K answered 4 months agoRelated Solutions
A uniform film of TiO2, 1036 nm thick and having index of refraction 2.62, is spread...
A uniform film of TiO2, 1036 nm thick and having index of
refraction 2.62, is spread uniformly over the surface of crown
glass of refractive index 1.52. Light of wavelength 460 nm falls at
normal incidence onto the film from air. You want to increase the
thickness of this film so that the reflected light cancels.
A) What is the minimum thickness of TiO2 that you must
add so the reflected light cancels as desired?
ΔT= ____ nm
B) After...
A uniform film of TiO2, 1036 nm thick and having index of refraction 2.62, is spread...
A uniform film of TiO2, 1036 nm thick and having index of
refraction 2.62, is spread uniformly over the surface of crown
glass of refractive index 1.52. Light of wavelength 450 nmfalls at
normal incidence onto the film from air. You want to increase the
thickness of this film so that the reflected light cancels.
What is the minimum thickness of TiO2 that you must
add so the reflected light cancels as desired?
After you make the adjustment in part...
A uniform film of TiO2, 1036 nm thick and having index of refraction 2.62, is spread...
A uniform film of TiO2, 1036 nm thick and having index of
refraction 2.62, is spread uniformly over the surface of crown
glass of refractive index 1.52. Light of wavelength 490 nm falls at
normal incidence onto the film from air. You want to increase the
thickness of this film so that the reflected light cancels.
a) What is the minimum thickness of TiO2 that you must
add so the reflected light cancels as desired?
b) After you make the...
In a slab of material 0.25 m thick and having a thermal conductivity of 45 W/mK,...
In a slab of material 0.25 m thick and having a thermal
conductivity of 45 W/mK, the
temperature °C at x under steady state is given by T = 100 + 200x –
400x2 when x is measured
from one face in m. Determine the heat flow at x = 0, x = 0.125 and
x = 0.25 m and also the
temperatures and temperature gradients at these planes. If the
difference in heat flow at these
sections is due...
Use activity coefficients to find the concentration of hydrogen ions in a solution of 75.0 mM...
Use activity coefficients to find the concentration of hydrogen
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NaCl. The ionization constant of butanoic acid is Ka = 1.52 × 10-5.
Take the size of C3H7COO– to be 500 pm.
What is the pH of this solution? Include activity coefficients in
your calculation.
What is the fraction of dissociation of butanoic acid in this
solution?
A solution contains naphthalene (C10H8) dissolved in hexane (C6H14) at a concentration of 11.92 % naphthalene...
A solution contains naphthalene (C10H8) dissolved in hexane
(C6H14) at a concentration of 11.92 % naphthalene by mass.
Calculate the vapor pressure at 25 ∘C of hexane above the solution.
The vapor pressure of pure hexane at 25 ∘C is 151 torr.
A solution contains naphthalene (C10H8) dissolved in hexane (C6H14) at a concentration of 14.43 % naphthalene...
A solution contains naphthalene (C10H8) dissolved in hexane
(C6H14) at a concentration of 14.43 % naphthalene by mass.
Calculate the
vapor pressure at 25
∘C
of
hexane above the solution. The vapor pressure of pure hexane at
25
∘C
is
151
torr.
A solution contains naphthalene (C10H8)dissolved in hexane (C6H14) at a concentration of 12.84 % naphthalene by...
A solution contains naphthalene (C10H8)dissolved in hexane
(C6H14) at a concentration of 12.84 % naphthalene by mass.
Calculate the vapor pressure at 25 ∘C of hexane above the solution.
The vapor pressure of pure hexane at 25 ∘Cis 151 torr.
A 50 cm *50 cm copper slab 6.25 mm thick has uniform temperature of 300℃. Its...
A 50 cm *50 cm copper slab 6.25 mm thick has uniform temperature
of 300℃. Its temperature is suddenly lowered to 36℃. (quenched in
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Take
The conductivity k=370 W/mK, the density rho=9100
kg/m3, the specific heat c=0.38 kJ/kg℃, the convection
coefficient h=90 W/m2℃.
1. Calculate
the surface area, As
2. Calculate
the volume, V.
3. Calculate
the characteristic length, Lc
4. Calculate
the Biot number, Bi
5. Calculate
the thermal diffusivity, α (alpha)
6. Calculate
the constant of time, τ (tau)
7. Calculate the time
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it is suddenly exposed to a constant surface flux of
3x104 W/m2. For this case, determine:
a. The temperature at a depth of 3 cm after a time of 10 min
b. The surface temperature at this time
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