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国际流体力学研究期刊
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN 打印: 2152-5102
ISSN 在线: 2152-5110

国际流体力学研究期刊

DOI: 10.1615/InterJFluidMechRes.v40.i6.50
pages 520-529

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

P. Srinvasa Rao
Andhra Pradesh Pollution Control Board, Regional Office Vizianagaram-535002, Andhra Pradesh, India
Ch. V. Subbarao
Department of Chemical Engineering, MVGR College of Engineering
G. M. J. Raju
Department of Chemical Engineering, AU College of Engineering, Andhra University Visakhapatnam-530003, Andhra Pradesh, India
V. S. R. K. Prasad
Anil Neerukonda Institute of Technology & Sciences (ANITS)

ABSTRACT

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.


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