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Experimental Study on Gas-Solid Flow in the Spouted Bed under Longitudinal Vortex Effect.

Feng Wu1, Xinxin Che1, Haojie Duan1

  • 1School of Chemical Engineering, Northwest University, Xi'an 710069, China.

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|November 19, 2019
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Summary

A longitudinal vortex generator enhances particle mixing in spouted beds by improving radial velocity. This effect is more pronounced with smaller particles and higher bed heights.

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Area of Science:

  • Fluid Dynamics
  • Particle Technology
  • Chemical Engineering

Background:

  • Spouted beds are widely used in chemical processes for mixing and heat/mass transfer.
  • Enhancing particle radial movement and mixing is crucial for optimizing spouted bed efficiency.
  • Conventional spouted beds can exhibit limitations in particle mixing and radial transport.

Purpose of the Study:

  • To investigate the impact of a longitudinal vortex generator on particle dynamics in a spouted bed.
  • To determine the influence of vortex generators and particle properties on axial and radial particle velocities.
  • To compare particle movement in a spouted bed with and without a longitudinal vortex generator.

Main Methods:

  • Utilized a 152 mm-diameter spouted bed apparatus.
  • Employed particle image velocimetry (PIV) for precise velocity measurements.
  • Introduced a longitudinal vortex generator to induce controlled vortex movement.

Main Results:

  • The longitudinal vortex generator created high-speed gas vortex movement and secondary fine vortices.
  • Significantly improved radial particle velocity compared to conventional spouted beds.
  • Observed increased early particle dropping with bed height and negative axial particle velocity.
  • Enhanced particle movement effect was stronger with smaller particle diameters.

Conclusions:

  • Longitudinal vortex generators effectively enhance radial particle velocity and mixing in spouted beds.
  • Particle size significantly influences the effectiveness of the longitudinal vortex generator.
  • The vortex generator shows potential for improving spouted bed performance across various particle sizes.