Bingham Number

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	\(\large{\frac{lbf}{in^2}}\)	\(\large{Pa}\)