In our previous paper, a novel heat exchanger concept, the so-called internally channeled tube(ICT) was suggested, based on a tubular geometry fitted with specially designed curved channelsalong the tube length. The enhanced heat transfer in the ICT results from extended surface areabetween two contacting fluids. To facilitate industrial application, ICT design methods must bedeveloped. This work provides new equations for thermo-hydraulic characterization of ICT underturbulent flow conditions. In particular, new friction factor and Nusselt number correlations arederived based on the validated CFD simulations performed over a wide range of Reynoldsnumbers and geometrical parameters.