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Digital Image Analysis of Gas Bypassing and Mixing in Gas-Fluidized Bed: Effect of Particle Shape
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  • Shreya Chouhan,
  • Ajita Neogi,
  • Hare Mohanta K,
  • Arvind Kumar Sharma,
  • Navneet Goyal,
  • Priya Sande C
Shreya Chouhan
Birla Institute of Technology & Science Pilani
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Ajita Neogi
Birla Institute of Technology & Science Pilani
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Hare Mohanta K
Birla Institute of Technology & Science Pilani
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Arvind Kumar Sharma
Birla Institute of Technology & Science Pilani
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Navneet Goyal
Birla Institute of Technology & Science Pilani
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Priya Sande C
Birla Institute of Technology & Science Pilani

Corresponding Author:priya@pilani.bits-pilani.ac.in

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Abstract

not-yet-known not-yet-known not-yet-known unknown The study investigates effect of shape on gas bypassing and mixing of gas-fluidized Geldart A particles. A shallow Fluidized Bed (FB), configured at bench-scale, was used with Digital Image Analysis (DIA) for the investigation. The extent of scatter of tracer particles throughout the bed was assessed from DIA images of defluidized powder. A novel method, employed Jupyter notebook software, which directly determined Mixing Index from the images. Remarkably, Platelet-shaped China clay powder displayed the best mixing characteristics (Mixing Index: 0.79) with no significant bypassing. Angular shaped Quartz displayed moderate mixing (Mixing Index: 0.67), but high bypassing (Bypassing Index: 0.75). Contrary to conventional assumptions, spherical diatomite exhibited poor mixing (Mixing Index: 0.61) with the highest bypassing (Bypassing Index: 0.82). Platelet particles performed well even with fines removal or larger particles addition. Most likely, particle shape significantly influenced the number of available particle contact points, tracer migration, and tracer on particle binding.
Submitted to AIChE Journal
18 May 2024Reviewer(s) Assigned
21 Jun 2024Review(s) Completed, Editorial Evaluation Pending
06 Aug 20241st Revision Received
21 Aug 2024Submission Checks Completed
21 Aug 2024Assigned to Editor
21 Aug 2024Review(s) Completed, Editorial Evaluation Pending
04 Sep 2024Reviewer(s) Assigned
08 Oct 2024Editorial Decision: Accept