Impact of coil pitch on heat transfer enhancement of a turbulent flow of α-Al2O3/DW nanofluid through helical coils

The current study experimentally examines the impact of coil pitch on heat transfer behavior and friction factor through helical coils for ?- Al2O3/Distilled water nanofluid turbulent flow. These tests were conducted with pitches 20, 35, 50 mm. nanoparticle volume fraction was 0.1%. nanoparticles in a 0.1% concentration increased rate compared to those distilled water. Increases also resulted greater efficiency. A correlation between Reynolds number, Prandtl curvature ratio shown be connected Nusselt numbers flow nanofluids within coils.