Effect of salt addition on the drag reduction by cationic surfactant

الملخص EN

In the present paper, an experimental study has been carried out to study the drag reduction in turbulent flow inside a tube by using surfactant with salt additives, where this phenomena used in many industry applications.

Therefore, the flow inside a pipe with high volumetric flow rate requires high power to transport it, so this needs large number of pumps to push it for remote distances and this pumps require great amount of fuels and cyclic maintenance ,so the additives reduce the number of pumps that is required to pump the liquids and so this decrease the cost of pumps, the fuel and maintenance or increases the volumetric flow rate at constant pressure drop.

The CTAB surfactant has added with concentrations of 1000,1500 and 2000 ppm, and the salt that is NASAl has added for water at 2000 ppm CTAB concentration with 200 and 400 ppm concentration.

The study has excuted with different values of Reynolds number that are 33418,44557,55697, 66836, 77976 and 89115,.Different angles of pipe inclinations has used through the work which are 0˚,3˚and 6˚.

The experimental results has correlated by using SPSS program, and solved by multiple nonlinear regression analysis.

The power law has found to be the optimum relation that may fits with the data that has obtained from the experimental work .