Abstract
A dilute suspension (volume fraction 0.05%) of rod-like particles in a turbulent backward-facing step flow at Reynolds number ReH=14900, is investigated by means of Particle Image Velocimetry. Two-way interactions between fluid and dispersed phase are analyzed by exploiting the high spatial resolution of the acquisitions. Mutual interactions between phases can be investigated by considering flow turbulence modulations and phenomena related to preferential concentration and orientation of fibers. Slight turbulence enhancement is reported in the laden flow and concentration data show a moderate tendency of fibers to accumulate at the channel centreline. Orientation data display a strong preferential orientation of fibers. Local fiber orientation is correlated to the direction of maximum shear showing a high level of correlation also in the flow regions featuring strong gradients.
Highlights
In many industrial and environmental applications such as chemical reactors, cyclone separators and devices for pollution abatement, multi-phase turbulent flows in which a carrier fluid is laden with a solid, dispersed phase are commonly encountered.The understanding of these peculiar suspensions is strongly connected to the investigation of the dynamic interactions between fluid and dispersed phase
Mutual interactions between phases can be investigated by considering flow turbulence modulations and phenomena related to preferential concentration and orientation of fibers
Local fiber orientation is correlated to the direction of maximum shear showing a high level of correlation in the flow regions featuring strong gradients
Summary
- RANS and LES analysis of a separation region in front of a backward-facing step. This content was downloaded from IP address 151.100.47.244 on 02/11/2020 at 17:44.
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