MEEN $223$ HW #$3-$ Ch $5$

The diffusion coefficient for $C{r}^{3+}$ in $C{r}_2{O}_3$ is $6{10}^{-15}c\frac{m^2}{s}$ at $727C$ and $1{10}^{-9}$

$c\frac{m^2}{s}$ at $1400C.$ Calculate:

$($a$)$ the activation energy, and

$($b$)$ the constant $D_0.$

A $0\mathrm{.}001$ in$.$ BCC iron foil is used to separate a high hydrogen content gas from a low

hydrogen content gas at $650C\mathrm{.}5{10}^{8}H$ atoms $\frac{?}{c{m}^3}$ are in equilibrium on one side of

the foil, and $2{10}^{3}H$ atoms $\frac{?}{c{m}^3}$ are in equilibrium on the other side. Determine:

$($a$)$ the concentration gradient of hydrogen, and

$($b$)$ the flux of hydrogen through the foil.MEEN $223$ HW #$3-$ Ch $5$

The diffusion coefficient for $C{r}^{3+}$ in $C{r}_2{O}_3$ is $6{10}^{-15}c\frac{m^2}{s}$ at $727C$ and $1{10}^{-9}$

$c\frac{m^2}{s}$ at $1400C.$ Calculate:

$($a$)$ the activation energy, and

$($b$)$ the constant $D_0.$

A $0\mathrm{.}001$ in$.$ BCC iron foil is used to separate a high hydrogen content gas from a low

hydrogen content gas at $650C\mathrm{.}5{10}^{8}H$ atoms $\frac{?}{c{m}^3}$ are in equilibrium on one side of

the foil, and $2{10}^{3}H$ atoms $\frac{?}{c{m}^3}$ are in equilibrium on the other side. Determine:

$($a$)$ the concentration gradient of hydrogen, and

$($b$)$ the flux of hydrogen through the foil.