Nusselt Number

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

Nusselt Number

Nusselt number ( \(Nu\) ) (dimensionless number) is a ratio of convective heat transfer to conductive heat across a boundary.

Nusselt Number FORMULA

\(Nu=\frac{h  l}{k}\)          \( Nusselt \; number   \;=\;  \frac{ heat \; transfer \; coefficient  \;\;x\;\;  characteristic \; length  }{ thermal \; conductivity }\)

Where:

\(Nu\) = Nusselt number

\(h\) = heat transfer coefficient

\(l\) = characteristic length

\(k\) = thermal conductivity

Solve for:

\(h=\frac{ Nu k }{ l  }\)

\(l=\frac{ Nu k }{ h  }\)

\(k=\frac{ h l }{  Nu  }\)

 

Tags: Equations for Temperature