INVESTIGATE THE EFFECTS OF FACTORS TO THE DRAG REDUCTION OF SURFACTANT SOLUTION

Abstract

This paper investigates the effects of tube diameter, counter-ion and surfactant concentrations in a
number of surfactant solutions at different concentrations when the solution flow is turbulent within a
circular pipe private. Increasing the counter-ion concentration expands the region of drag reduction of the
surfactant solution according to the Reynolds number to a larger Reynolds number. With 800ppmx10
solution, the reduction in drag increases to Reynolds number about 60000, the maximum pumped
capacity of the test system, and continues to increase further, while the 800ppmx1 solution offers a
reduced capacity. resistance up to Reynolds about 55000. Solutions with a higher concentration of
surfactant (800ppmx1) give a higher percentage of drag reduction (the highest is about 39% for Reynolds
number about 45000) and expands the region of drag reduction of the surfactant solution according to
the Reynolds number (up to a maximum Reynolds number about 55000) compared with a solution with
lower surfactant concentration (500ppmx1) with the highest percentage reduction of drag of about 35%
corresponding to a Reynolds number of about 40000, the region of resistance to maximum Reynolds
number 47000. Pipe diameter of 10mm provides better resistance reduction than 40mm tube, maximum
is 60%, with Reynolds number about 30000, while 40mm pipe only reaches 40% maximum with
Reynolds number about 40000.