FLOW OF DRAG REDUCING FLUIDS THROUGH A SUDDEN ENLARGEMENT | ||||
| ERJ. Engineering Research Journal | ||||
| Article 8, Volume 23, Issue 1, January 2000, Page 145-163 PDF (748.57 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/erjm.2000.71201 | ||||
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| Authors | ||||
| M.H. Embaby; M.A. El-Kady | ||||
| Mechanical Power Engineering Department, Faculty of Engineering, Minufiya University, Egypt. | ||||
| Abstract | ||||
| Theoretical and experimental studies, of drag reducing dilute polymer solution flow through a sudden enlargement, are carried out. A turbulence model, which has been early used for predicting Newtonian flows with adverse pressure gradient (APG), is developed in the present analysis. The developed model well predicts the fully developed drag reduction flow in pipes, i.e. flow under favorite pressure gradient (FPG) conditions besides the sudden enlargement (APG) flow. Predictions, of the mean flow properties and turbulence characteristics of drag reduction turbulent flows in a sudden enlargement -i.e. under (APG)- are obtained and discussed. An experimental setup is established for studying the pressure characteristics of the flow through a (2:1) diameter ratio sudden enlargement test section. The working fluids are dilute solutions of Polyethylene Glycol (PEG) polymer in tap water. Comparison between theoretical and experimental pressure distribution results shows a reasonable agreement. It is concluded that the developed turbulence model can be used to predict drag reducing polymer flows under both (FPG) and (APG) conditions. | ||||
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