The constant Kc was introduced by J. Vermeer with a value of 0.1638 in the paper: 'A simple formula for the calculation of the convective heat transfer between conductor and sheath in compressed gas insulated (CGI) cables', 1983 as published in Elektra 87.

Symbol
$K_{\mathrm{c}}$
Unit
-
Formulae
$0.158 \pi \left(\beta_{\mathrm{gas}} g\right)^{0.333}$
Related
$\beta_{\mathrm{gas}}$
$W_{\mathrm{conv_{\mathrm{ce}}}}$