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Title of Journal: Exp Fluids

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Abbravation: Experiments in Fluids

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Springer-Verlag

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10.1007/s41109-016-0017-9

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1432-1114

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Polymerinduced turbulence modifications in an imp

Authors: R MejiaAlvarez K T Christensen
Publish Date: 2011/12/25
Volume: 52, Issue: 5, Pages: 1237-1260
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Abstract

This effort explores the impact of dilute polymer solutions on the turbulence characteristics in a submerged liquid impingingjet configuration Turbulent impinging jets are commonly used in technological applications such as drying scouring cooling or heating due to an enhancement in transport characteristics in the impingement region under certain nozzletowall configurations Previous efforts have identified significant turbulence modifications in the presence of dilute concentrations of polymer in both bounded and unbounded flows though the former has received considerably more attention To this end particleimage velocimetry measurements were taken for an axisymmetric turbulent impinging jet with a nozzletowall distance H/D = 68 and nominal Reynolds number of 26000 Measurements were performed for both plain water and dilute polymer solutions of polyethylene oxide at concentrations of 50 and 100 ppm The mean and turbulence characteristics of these three flows are contrasted and it is observed that the two polymer solutions modify both the mean and turbulent characteristics of the jet in all three regions of interest the freejet impingement and walljet regions Of interest the 50 ppm case yielded a slight suppression of the turbulence in the freejet region accompanied by a longer axial length of the potential core compared to the case of plain water In contrast the 100 ppm case exhibits clear enhancement of the turbulence in the freejet region and a shortening of the potential core length The effect of polymer was opposite in the impingement and walljet regions wherein the turbulence was slightly suppressed in the 100 ppm case in a manner consistent with the onset of the Toms effect in this wallbounded region of the flowThis work was supported by the University of Illinois Pipe flow frictionfactor measurements were taken in the Microfluidics and Ejecta Transport Laboratory of the Dynamic Materials Team at Los Alamos National Laboratory under the supervision of Dr BJ Balakumar The authors gratefully acknowledge the assistance of Prof Randy Ewoldt at the University of Illinois in attempting the CaBER measurements for the polymer solutions studied herein

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