Experimental investigation on heat transfer and frictional characteristics of spirally corrugated tubes in turbulent flow at different Prandtl numbers

Corrugated tubes have been experimentally studied in order to obtain their heat transfer and isothermal friction characteristics. The use of water and ethylene glycol as test fluids has allowed to cover a wide range of turbulent fluid flow conditions: Reynolds number from 2000 to 90 000 and Prandtl number from 2.5 to 100.