Development and validation of a PIV processing routine for two-phase index-matched flows

Turbulent particle-laden flows are of interest due to their presence in many industrial and natural flows. The effect that the particles have on the turbulence of the fluid is referred to as turbulence modulation. Experimental data is lacking at Reynolds numbers greater than 100,000, and at dense loadings (FV > 1%). In this work, turbulent particle-laden flow over a deep cavity with an aspect ratio of 1, was studied at Reynolds numbers of 11,500 and 115,000, and particle loadings of 0%, 1%, 3%, and 5% by weight/volume (solid-phase specific gravity = 1). Super absorbent particles were used to create an index-matched environment with water as the working fluid. Data were acquired using 2-D planar particle image velocimetry (PIV) along the center span of the geometry. Mean and root-mean-square (rms) velocities were calculated for the fluid phase. The flow structures were identified and located using the gamma criteria. The results showed that the particle loading changed the locations of the recirculation regions within the cavity. The mean velocities were nominally unaffected by loading for a respective Reynolds number case. Prior literature suggested that the particles would attenuate the turbulence, however, the current data showed no single trend. Turbulence modulation of the flow was found to be sensitive to the Reynolds number and location within the flow field. The changes in the turbulence appeared to be primarily due to the differences in the location in the flow structures.

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Development and validation of a PIV processing routine for two-phase index-matched flows

Cited by 3 publications

References 26 publications

Development of the apertured filter (AF) method for simultaneous two-phase measurement from single images

Development of the apertured filter (AF) method for simultaneous two-phase measurement from single images

Analysis of interaction structure of circular laminar jets using digital image processing

Investigation of Particle Loading on the Turbulent Flow Over a Deep Cavity

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