Biot Number

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

Biot Number, abbreviated as Bi, a dimensionless number, is the ratio of internal thermal resistance of solid to fluid thermal resistance.  This is used for heat transfer between fluids and solids.


Formulas that use Biot Number

\(\large{ Bi=\frac{h \; l_c}{k}  }\)   


\(\large{ Bi }\) = biot number

\(\large{ l_c }\) = characteristic length

\(\large{ h }\) = heat transfer coefficient of film coefficient or convective heat transfer coefficient

\(\large{ k }\) = thermal conductivity of the body


Tags: Equations for Heat Transfer