Bejan Number - Heat Transfer

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

 

Bejan Number - Heat Transfer formula

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

Where:

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