camera iphone 8 plus apk Dune formation in dilute phase pneumatic transport system

S Jhalani, A Patankar, A Makawana, M Bose,
Department of Energy Science and Engineering, IIT Bombay; India - 400076

Dunes are ripples on the surface of desert sands formed by grazing winds. They are also observed in a flow of a dilute gas-solid mixture through horizontal pipes, channels and pneumatic conveying systems. They form even in a clean pipe, as a result of particle segregation, unlike in desert dunes which are formed on a surface of a bed of the particles. While dunes have been observed in clean pipes, a detailed and close examination of the initiation and growth is not available in literature. Here we investigate the formation of dunes using high speed imaging on a laboratory scale pneumatic transport set-up with a transparent test section. Glass particles with 166 μm Sauter mean diameter are used for the experiments. We find multiple distinct isolated dune shaped clusters at the bottom of the pipe even at a very low bulk solid volume fraction. A closer look reveals that the dunes are closely packed and the transition layer is only a few particle diameters thick. The clusters are largely very stable but they sometimes become unstable. The particle velocity at the dune surface is much lower than that in the bulk.

Acknowledgement:
We thank Sanket, Mohit, Harshal and Prof. Sudesh Balan, IDC, IIT Bombay for helping us with experiments and editing the video.

camera iphone 8 plus apk Dune formation in dilute phase pneumatic transport system
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Science & Technology	Upload TimePublished on 19 Jun 2017

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