Graetz number
= Graetz number
{wiki=Graetz_number}
The Graetz number (Gz) is a dimensionless number used in the field of heat transfer, particularly in the analysis of heat transfer in ducts and pipes. It is a measure of the relative importance of heat conduction to heat convection in a flow situation. The Graetz number is defined as: \\\[ Gz = \\frac\{L c_p\}\{k A\} \\\] Where: - \\(L\\) is the characteristic length (often the length of the duct or pipe).