Hartmann Number

Hartmann number, abbreviated as Ha, a dimensionless number, the ratio of electromagnetic force to the viscous.

 

Hartmann Number formula
\(\large{ Ma =  B \; l \; \sqrt{ \frac{ \sigma }{ \mu } }  }\)
Symbol	English	Metric
\(\large{ Ha }\) = Hartmann number	\(\large{dimensionless}\)
\(\large{ l }\) = characteristic length	\(\large{ft}\)	\(\large{m}\)
\(\large{ \mu }\)  (Greek symbol mu) = dynamic viscosity	\(\large{\frac{lbf-sec}{ft^2}}\)	\(\large{ Pa-s }\)
\(\large{ \sigma }\)  (Greek symbol sigma) = electrical conductivity	-	\(\large{\frac{S}{m}}\)
\(\large{ B }\) = magnetic field	-	\(\large{T}\)