Bejan Number - Mass Transfer

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

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

 

Bejan Number - Mass Transfer formula

\(\large{ Be =  \frac{ \Delta p \; l^2 }{ \mu \; D_m }  }\) 

Where:

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

 

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Tags: Pressure Equations