Bejan Number - Heat Transfer

on . Posted in Dimensionless Numbers

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

 

Bejan Number - Heat Transfer formula

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

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

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

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

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

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 \(lbf-sec\;/\;ft^2\) \( Pa-s \)
\( \alpha \)  (Greek symbol alpha) = thermal diffusivity \(ft^2\;/\;sec\)  \(m^2\;/\;s\) 

 

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Tags: Heat Transfer Open Channel Pressure Loss