Bejan number - mass transfer, abbreviated as Be, a dimensionless number, is the pressure drop along a channel of length.
Bejan Number - Mass Transfer formula |
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\( Be \;=\; \Delta p \; l^2 \;/\; \mu \; D_m \) (Bejan Number - Mass Transfer) \( \Delta p \;=\; Be \; \mu \; Dm \;/\; l^2 \) \( l \;=\; \sqrt{ Be \; \mu \; Dm \;/\; \Delta p } \) \( \mu \;=\; \Delta p \; l^2 \;/\; Be \; Dm \) \( Dm \;=\; \Delta p \; l^2 \;/\; Be \; \mu \) |
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| Symbol | English | Metric |
| \( Be \) = Bejan Number | \(dimensionless\) | \(dimensionless\) |
| \( \Delta p \) = 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 | \(ft^2\;/\;sec\) | \(m^2\;/\;s\) |
