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Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
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Related Experiment Video

Updated: Mar 14, 2026

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Multi-scale CFD simulation of hydrodynamics and cracking reactions in fixed fluidized bed reactors.

Jin H Zhang1, Zhen B Wang1, Hui Zhao1

  • 1State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao, 266580 China.

Applied Petrochemical Research
|September 23, 2016
PubMed
Summary

A modified fixed fluidized bed reactor improves heavy oil cracking by enhancing gas-solid mixing and reducing gas back-mixing. This leads to better reaction performance compared to conventional reactors.

Keywords:
Catalytic crackingFixed fluidized bed reactorMulti-scale structureReaction kineticsSimulation

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Area of Science:

  • Chemical Engineering
  • Fluid Dynamics
  • Catalysis

Background:

  • Fixed fluidized bed reactors are crucial for assessing heavy oil crackability and catalyst activity.
  • Understanding hydrodynamics and reaction kinetics is key to optimizing reactor performance.

Purpose of the Study:

  • To investigate and compare the hydrodynamics, reaction kinetics, and thermodynamics of conventional and modified fixed fluidized bed reactors.
  • To analyze gas mixing, particle distribution, and product yields in both reactor types.

Main Methods:

  • Computational fluid dynamics (CFD) combined with an energy-minimization multi-scale two-fluid model.
  • A six-lump kinetic model was employed to simulate cracking reactions.
  • Residence time distribution (RTD) modeling was used to quantify gas back-mixing.

Main Results:

  • Simulated product distributions closely matched experimental data.
  • The modified reactor demonstrated improved gas-solid mixing and reduced gas back-mixing.
  • The modified reactor exhibited characteristics closer to an ideal plug flow reactor.

Conclusions:

  • The modified fixed fluidized bed reactor design offers superior performance for heavy oil cracking.
  • Enhanced mixing and reduced back-mixing in the modified reactor lead to improved reaction efficiency.