Bejan Number - Fluid Mechanics

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

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

 

Bejan Number - Fluid Transfer formula

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

 

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Tags: Pressure Equations Fluid Equations