Uncertain which "k" Bobo is talking about - maybe simply "Absorbed Watts"/"Source Watts"
Suspect Cathar is referring to
ε =The effectiveness of a cold plate or heat sink is the ratio of heat transferred to the ideal case in which all fluid achieves the surface temperature:(
link .Equivalent to e in the Definitive Nomenclature list*
When Thermal Effectivenesses
εs and "C/W"s are considered in relation to flow rate(
link) there are situations where low flow may be used to advantage : Peltier chiller(
link) or external rad(probably best with rad design with low Rwet at low water flow - high water velocity rad)
Playing with the sums for internal radiator.- difference between dT(die-water) being effected by LMTD(wb), and T(water wb in) being effected TD(rad).
Sums are a can of worms and most probably up the wrong tree - heat balance may simply be wrong.
*BTW Definitive Nomenclature for rads are a beast for - so far identified 48 (
link