Rule-based Mamdani-type fuzzy modeling of heating and cooling performances of counter-flow Ranque-Hilsch vortex tubes with different geometric construction for steel

► Heating and cooling performances of vortex tubes were experimentally investigated and modeled with Fuzzy modeling. ► The maximum heating performance of the vortex tube system was found to be at 41.7 °C ► The maximum cooling performance of the vortex tube was at −31.1 °C ► Input parameters (ξ, L/D) and output parameters ΔTh, ΔTc were described by RBMTF if-then rules. ► R2 for the ΔTh was found to be 97.76% and R2 for the ΔTc was 98.08%.