Bejan Number - Mass Transfer

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Bejan number - mass transfer, abbreviated as Be, a dimensionless number, is the pressure drop along a channel of length.

 

Bejan Number - Mass Transfer formula

\( Be =  \Delta p \; l^2 \;/\; \mu \; D_m \)     (Bejan Number - Mass Transfer)

\( \Delta p =   Be \; \mu \; Dm \;/\; l^2 \)

\( l =  \sqrt{  Be \; \mu \; Dm \;/\; \Delta p }  \)

\( \mu =  \Delta p \; l^2 \;/\; Be \; Dm \)

\( Dm =   \Delta p \; l^2 \;/\; Be \; \mu \)

Symbol English Metric
\( Be \) = Bejan number \(dimensionless\)
\( \Delta p \) = pressure drop \(lbf\;/\;in^2\) \(Pa\)
\( l \) = length of channel \(ft\) \(m\)
\( \mu \)  (Greek symbol mu) = dynamic viscosity \(lbf-sec\;/\;ft^2\) \( Pa-s \)
\( D_m \) = mass diffusivity  \(ft^2\;/\;sec\)  \(m^2\;/\;s\) 

 

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Tags: Open Channel Pressure Loss