Nusselt Number

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

Nusselt number, abbreviated as Nu is a dimensionless number that describes the ratio of convective heat transfer to conductive heat across a boundary.  The calculation and equation for determining the Nusselt number is below.

\(\large{ Nu=\frac{h  l_c}{k}   }\)         

Where:

\(\large{ Nu }\) = Nusselt number

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

\(\large{ h }\) = heat transfer coefficient

\(\large{ k }\) = thermal conductivity

 

Solve for:

\(\large{ h=\frac{ Nu k }{ l_c  }   }\)

\(\large{ l_c =\frac{ Nu k }{ h  }    }\)

\(\large{ k=\frac{ h l_c }{  Nu  }    }\)

 

Tags: Equations for Temperature