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Some air-cooled heat exchangers, especially in air conditioning and heating installations, heat pumps, as well as car radiators, work in a wide range of loads when the liquid flow in the tubes can be laminar, transitional or turbulent. In this paper, a semi-empirical and empirical relationship for the Nusselt number on the liquid-side in the transitional and turbulent range was derived. The friction factor in the transition flow range w, trb w w, tre Re Re Re was calculated by lineardoi:10.1051/matecconf/201824002012 fatcat:72mvlcachzctbchrvm5zoey3pm