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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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Laminar Flow: Problem Solving01:24

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Steady Flow of a Fluid Stream01:27

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Consider a control volume, such as a pipe with solid boundaries, through which fluid flows and changes direction due to the impulse exerted by the resulting force from the pipe walls. In steady flow, the mass of fluid entering the control volume at a given time, t, with velocity v1, is equal to the mass leaving after infinitesimal time dt, with velocity v2.
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Rapidly Varying Flow01:24

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Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
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Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) Study of Mass-Transfer Mechanisms in Riser Flow.

Álvaro E Carlos Varas1, E A J F Peters1, J A M Kuipers1

  • 1Department of Chemical Engineering and Chemistry, Multiphase Reactors Group, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands.

Industrial & Engineering Chemistry Research
|May 30, 2017
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Summary
This summary is machine-generated.

Particle clusters significantly impact mass transfer in gas-solid riser reactors. Lower air-to-solids ratios increase clustering, reducing gas-solid contact efficiency and affecting reactor performance.

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Area of Science:

  • Chemical Engineering
  • Fluid Dynamics
  • Particle Technology

Background:

  • Cocurrent gas-particle flows in risers are crucial for chemical reactions.
  • Understanding mass transfer and reaction kinetics in these systems is complex.
  • Particle clustering significantly influences flow dynamics and efficiency.

Purpose of the Study:

  • To investigate the interplay between mass transfer and heterogeneous catalysis in riser flows.
  • To analyze the impact of particle clustering on gas-solid contact efficiency.
  • To quantify the influence of various flow parameters on riser reactor performance.

Main Methods:

  • Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) simulations.
  • Evaluation of slip velocity, axial gas dispersion, gas bypassing, and particle mixing.
  • Analysis under various riser flow conditions and parameter variations.

Main Results:

  • Particle cluster formation is a key factor affecting mass transfer.
  • Low air-to-solids flux ratios promote heterogeneous systems and pronounced clustering.
  • Falling clusters reduce gas-solid contact efficiency due to gas bypassing.

Conclusions:

  • Particle clustering critically impacts the performance of riser reactors.
  • Optimizing air-to-solids flux ratios can mitigate negative clustering effects.
  • Quantifying cluster effects provides insights for improved reactor design and operation.