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Influence of Viscosity on Drag in Presence of Polymer Solutions in Gravity Driven Flow Systemy

2013; Begell House; Volume: 40; Issue: 6 Linguagem: Inglês

10.1615/interjfluidmechres.v40.i6.50

1064-2277

P. S. Rao, Ch. V. Subbarao, Gangadhara Raju, V. Prasad,

Oil and Gas Production Techniques

Mathematical equation for efflux time is developed during gravity draining of a Newtonian liquid from a large spherical tank through an exit pipe under laminar flow conditions in the exit pipe. This equation gives the maximum time required for draining the contents of spherical storage vessel. The model is verified with the experimental data for water as well as for different viscosities of Glycerin solutions and found to be in good agreement with a maximum deviation of 14.8 % and an average deviation of 9 %. Experiments are also performed with mixed solutions containing aqueous polymer solutions and Glycerin. The polymers used in this study are Polythene Oxide (PEO) and Polyacryl Amide (PAM). Drag reduction takes place only in presence of polymer solutions. However, in case of polymer solutions mixed with Glycerin, in stead of drag reduction, drag enhancement takes place. The possible reasons for drag enhancement are also discussed.