Akbar Darvishi - Department of Petroleum Engineering, Firoozabad Branch, Islamic Azad University, Firoozabad, Iran

A new type of aqueous drag-reducing fluid with CaCO3 nanoparticles was developed. The new working fluid was an aqueous solution with CaCO3 nanoparticles added and has special effects of drag-reducing in pipelines. An experimental apparatus was set up. The test section of the apparatus consisted of a smooth carbonate pipe and four galvanized iron pipes with the same length (4 m). Experiments were done to study the drag and pressure reduction in turbulent flow of a relatively new category of drag-reducing fluids which are names as nanofluids, in five different horizontal pipes with 1/4-1 diameters and 6 length. Results indicated that there were obvious differences of the drag-reducing and pressure drop characteristics between conventional Newtonian liquid (water) and new drag-reducing nanofluid. In addition, drag reduction in rough pipes was more than that in smooth ones at the same Reynolds number and it improved, as the relative roughness increased

Drag reduction, CaCO3, Nanofluid, Turbulent flow, Horizontal pipe