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The Role of Solid Mechanics in Stabilising Structured Flows

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Dynamically Structured Flow in Pulsed Fluidised Beds

Part of the book series: Springer Theses ((Springer Theses))

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Abstract

This chapter provides a detailed description of the self-organisation of bubbles into triangular lattices in quasi-2D beds of glass beads fluidised under oscillatory flows of varying frequency. The flow pattern is quantified experimentally by studying the time evolution of the size, velocity and separation of bubbles. A comparative numerical study using discrete and continuum models reveals the stabilising effect induced by interparticle friction. When the bed contracts, the bottom layer of granules forms temporally locked regions that synchronise with the nucleation of bubbles and stabilise flow structures. Due to the frictionless nature, classic continuum models underpredict the energy dissipation and create a long-range, macroscopic recirculation of particles, leading to a fundamentally different fluidisation state.

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Authors and Affiliations

  1. Department of Chemical Engineering, University College London, London, UK

    Kaiqiao Wu

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  1. Kaiqiao Wu
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Correspondence to Kaiqiao Wu .

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Wu, K. (2021). The Role of Solid Mechanics in Stabilising Structured Flows. In: Dynamically Structured Flow in Pulsed Fluidised Beds. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-030-68752-6_5

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