NDLI: Polymer-induced Turbulence Modifications in an Impinging Jet By

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Polymer-induced Turbulence Modifications in an Impinging Jet By

Content Provider	Semantic Scholar
Author	Alvarez, Rodolfo M. Posada
Copyright Year	2010
Abstract	This effort explores the impact of dilute polymer solutions on the turbulence characteristics in a submersed liquid impinging-jet 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 nozzle-to-wall configurations. Previous efforts have identified significant turbulence modifications in the presence of dilute concentrations of polymer (i.e., the Toms effect) in both bounded (suppression) and unbounded (either suppression or enhancement) flows. To this end, particle-image velocimetry measurements were made for an axisymmetric turbulent impinging jet with a nozzle-to-wall distance H/D = 6.8 and Reynolds number ReD = 23000. Measurements were made 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 50 ppm case yields a slight enhancement of the turbulence while the 100 ppm case exhibits clear suppression of the turbulence.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://www.ideals.illinois.edu/bitstream/handle/2142/16174/MejiaAlvarez_Ricardo.pdf?sequence=2
Language	English
Access Restriction	Open
Subject Keyword	Computer cooling Cool - action Exhibits as Topic Flow Heating Nozzle Device Component Polyethylene Glycols Polymer Solutions The 100 Turbulence Zero suppression part per million (ppm)
Content Type	Text
Resource Type	Article

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