Effect of polymer injection on frictional drag in turbulent pipe flow
Experimental results concerning the effect of injection of a drag-reducing polymer solution along the confining boundary for turbulent pipe flow are described. Tests were made using a 1.625-in.-diam pipe provided with 5 circumferential injection slots located 6-in. apart. The polymer used was Polyox WSR-301. The effects of variation of Reynolds number, injection rate, number of injection points, and concentration of injected solution were studied. The results of the investigation show that, in general, the trends exhibited for premixed flows are also displayed for the case of polymer injection. It was found that the drag-reducing action was most effective when the polymer was injected through the furthest upstream slot rather than being distributed over the test length. For the injection slot design employed in this investigation, a pronounced injection drag was measured. This injection drag is thought to be caused by the high viscosity of the polymer solution and the disturbance of the main flow caused by the injection. (11 refs.)
- Research Organization:
- Tennessee Univ.
- OSTI ID:
- 5665602
- Journal Information:
- J. Hydronaut.; (United States), Journal Name: J. Hydronaut.; (United States) Vol. 4:1; ISSN JHYDB
- Country of Publication:
- United States
- Language:
- English
Similar Records
Local drag reduction due to injection of polymer solutions into turbulent flow in a pipe; part II: laser-Doppler measurements of turbulent structure
Turbulent and transition pipe flow of dilute aqueous polymer solutions