Effect of polymer additives on the small-scale structure of grid-generated turbulence

AIP Publishing - Tập 20 Số 6 - Trang 873-879 - 1977
W D McComb1, John J. Allan1, Clive Greated1
1School of Engineering Science, University of Edinburgh, Edinburgh, Scotland

Tóm tắt

The effect of polyethyleneoxide (Polyox grade WSR 301) on grid-generated turbulence was investigated using laser anemometry and flow-visualization techniques. It was found that the polymer additive reduced both the turbulent intensity and the rate of decay behind the grid. At typical drag-reducing concentrations, turbulent energy spectra were qualitatively the same as those in water, in agreement with the results of other investigations. However, at higher additive concentrations, the dissipation-range spectra showed noticeable attenuation. This seemed to be a threshold effect with onset at a polymer concentration between 100 and 250 ppm. This result was supported by photographs of dye-injection tracer but in this case the onset concentration for small-eddy suppression was between 50 and 100 ppm.

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Tài liệu tham khảo

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AIP Publishing

Tập 20 Số 6

873-879

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