کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
671149 | 1459087 | 2009 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Turbulent pipe flow of a drag-reducing rigid “rod-like” polymer solution Turbulent pipe flow of a drag-reducing rigid “rod-like” polymer solution](/preview/png/671149.png)
Fully developed turbulent pipe flow of an aqueous solution of a rigid “rod-like” polymer, scleroglucan, at concentrations of 0.005% (w/w) and 0.01% (w/w) has been investigated experimentally. Fanning friction factors were determined from pressure-drop measurements for the Newtonian solvent (water) and the polymer solutions and so levels of drag reduction for the latter. Mean axial velocity u and complete Reynolds normal stress data, i.e. u′, v′ and w′, were measured by means of a laser Doppler anemometer at three different Reynolds numbers for each fluid. The measurements indicate that the effectiveness of scleroglucan as a drag-reducing agent is only mildly dependent on Reynolds number. The turbulence structure essentially resembles that of flexible polymer solutions which also lead to low levels of drag reduction.
Journal: Journal of Non-Newtonian Fluid Mechanics - Volume 161, Issues 1–3, September 2009, Pages 86–93