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Calculations
Recommendations
Septic tank project - SALUTAR dimensions
Gate and valve adjacent to the filter: recomended dimensions
Filter outlet: rectangular weir
Fuller's formula
BOD and COD removal efficiencies in aerated submerged biological filters
Wilke's multicomponent equation
Default
Input data
Table
Diffusivity of A in N
m²/s
cm²/s
Molar fraction of N
-
.
Add row
Molar fraction of A in the mixture
-
Output data
Diffusivity coefficient of A in the mixture
m²/s
cm²/s
Description
Calculate the diffusivity of a component in a gas mixture using Wilke's equation:
D
A
,
M
=
1
∑
Y
N
′
D
A
,
N
D_{A,M} = \frac{1}{\sum{\frac{Y'_N}{D_{A, N}}}}
D
A
,
M
=
∑
D
A
,
N
Y
N
′
1
Y
N
′
=
y
N
1
−
y
A
Y_N' = \frac{y_N}{1 - y_A}
Y
N
′
=
1
−
y
A
y
N
Where:
D
A
,
N
D_{A,N}
D
A
,
N
: Gas diffusivity of
A
A
A
in the
N
N
N
-th component of the mixture;
y
N
y_N
y
N
: Molar fraction of
N
N
N
in the mixture;
References
WELTY, James; WICKS, Charles E.; WILSON, Robert E.; RORRER, Gregory L. Fundamentals of Momentum, Heat and Mass Transfer. 5th Ed. John Wiley & Sons, 2008.