Abstract
Turbulent flow of a Non-Newtonian polymeric fluid through concentric annuli is studied using a 9 m long horizontal flow loop (radius ratio = 0.4). The measurement technique used is Particle Image Velocimetry (PIV). The solvent Reynolds number is found to vary from 47000 to 66400. Pressure drops are measured and used to detect the onset of transition to turbulence. Measured velocity profiles are found to agree with the universal law of the wall for y + < 11. In the logarithmic region, however, velocity profiles deviate from log law, in a manner consistent with the flow of Newtonian fluids. Reynolds stress is found to be reduced significantly compared to water. The polymer is found to contribute significantly to the total stress close to the solid walls. The radii of maximum velocity are found to be biased toward the inner wall. Results of the turbulence intensity analysis show a slight increase of axial intensities in the buffer layer and especially around the outer wall of the annuli for polymer solutions. Radial velocity fluctuations are suppressed by means of polymer solution. The Root Mean Square (RMS) of vorticity fluctuation in the axial direction is also analyzed revealing a significant reduction of vortical activities as polymer is added to the flow.
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Bizhani, M., Corredor, F.E.R. & Kuru, E. An Experimental Study of Turbulent Non-Newtonian Fluid Flow in Concentric Annuli using Particle Image Velocimetry Technique. Flow Turbulence Combust 94, 527–554 (2015). https://doi.org/10.1007/s10494-014-9589-6
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DOI: https://doi.org/10.1007/s10494-014-9589-6