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Resuspension threshold of a granular bed by localized heating
C Morize1, E Herbert1,2, A Sauret1,3
1Laboratoire FAST, CNRS, Université Paris-Sud, Université Paris-Saclay, 91405 Orsay, France.
Physical Review. E
|January 20, 2018
Summary
Heating granular beds can fluidize them, causing particle plumes. This study shows temperature gradients drive particle resuspension, with thresholds depending on bed thickness and buoyancy.
Area of Science:
- Fluid Dynamics
- Geophysics
- Particle Science
Background:
- Particle resuspension and dispersion are critical in industrial, environmental, and geophysical processes.
- Understanding particle behavior in fluid dynamics is essential for various applications.
Purpose of the Study:
- To experimentally investigate the fluidization of a granular bed using a vertical temperature gradient.
- To identify the conditions and mechanisms driving particle entrainment and transport.
Main Methods:
- Laboratory experiments utilizing a localized heat source to create a temperature gradient within a granular bed.
- Observation of particle entrainment and the formation of particle-laden plumes.
Main Results:
- A significant entrainment of particles into the fluid volume was observed above a critical temperature threshold.
- Buoyancy-driven fluidization leads to the formation of particle-laden plumes, facilitating solid particle transport.
- The destabilization process is governed by the thermal conductivity within the granular bed.
Conclusions:
- The threshold temperature for fluidization is dependent on the granular bed's thickness and the buoyancy number.
- Thermal gradients can effectively fluidize granular beds, leading to particle transport via plumes.
- Findings provide insights into particle dynamics in temperature-stratified granular systems.
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