Bingham Number

on . Posted in Dimensionless Numbers

Bingham number, abbreviated as Bm, a dimensionless number, is the ratio of yield stress to visvous stress.


Bingham Number formula

\(\large{ Bm = \frac{ \tau_y  \; l }{ \mu\; v }  }\) 
Symbol English Metric
\(\large{ Bm }\) = Bingham number \(\large{dimensionless}\)
\(\large{ l }\) = characteristic length \(\large{ft}\) \(\large{m}\)
\(\large{ \mu }\)  (Greek symbol mu) = dynamic viscosity of fluid \(\large{\frac{lbf-sec}{ft^2}}\) \(\large{ Pa-s }\)
\(\large{ v }\) = velocity \(\large{\frac{ft}{sec}}\) \(\large{\frac{m}{s}}\)
\(\large{ \tau_y }\)  (Greek symbol tau) = yield stress \(\large{\frac{lbf}{in^2}}\) \(\large{Pa}\)


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Tags: Flow Equations Pipe Equations