DEGRADATION EFFECTS AND ENTRANCE LENGTH STUDIES FOR A DRAG REDUCING FLUID IN A SQUARE DUCT
Titel:
DEGRADATION EFFECTS AND ENTRANCE LENGTH STUDIES FOR A DRAG REDUCING FLUID IN A SQUARE DUCT
Auteur:
Lee, H. S. Irvine, Thomas F.
Verschenen in:
Chemical engineering communications
Paginering:
Jaargang 25 (1984) nr. 1-6 pagina's 79-91
Jaar:
1984-01-01
Inhoud:
Experimental measurements were made of fully developed friction factors for laminar and turbulent flows of dilute aqueous solutions of Polyox (WSR-301) in a square duct. In the first phase of the study, the following factors were investigated to determine their effect on polymer degradation; valve placement in the flow loop, type of duct entrance section, addition of polymer “stabilizers” to the solution, waiting lime between polymer mixing and experimental measurements, polymer age and rust in the system. All of these factors were found to affect drag reduction. In the second phase, hydrodynamic entrance lengths were determined by measuring local pressure drops for water and polymer solutions over a Reynolds number range of 600 ≤ Re ≤ 27,000. For polymer solutions, the entrance lengths increased significantly over the water values in the turbulent regime.
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