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S10 Fluidodinâmica de Escoamento Multifásico |
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Title:
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HYDRODYNAMIC SELF-DISPERSION IN A DILUTE SEDIMENTING SUSPENSION
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Summary :
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MICROSTRUCTURAL CHANGES, THAT IS AN IMPORTANT FEATURE FOR THE UNDERSTANDING OF VELOCITY FLUCTUATIONS IN SEDIMENTATION IS INVESTIGATED WITH NUMERICAL SIMULATIONS. THE SIMULATIONS ARE USED TO DESCRIBE HYDRODYNAMIC DISPERSION IN A SUSPENSION OF INTERACTING PARTICLES SEDIMENTING IN A RECTANGULAR BOX WITH PERIODIC SIDES AND IMPENETRABLE BOTTOM AND TOP. IT IS OBSERVED HOW THE POSITIONS OF THE PARTICLES EVOLVE IN A FINITE CONTAINER. THE SUSPENSION THAT WAS INITIALLY RANDOM IN THE GRAVITY DIRECTION ONLY, TENDS TO BE FULLY RANDOMIZED AS A RESULT OF THE RELATIVE ARRANGEMENTS OF THE PARTICLES AND THE HYDRODYNAMIC INTERACTIONS BETWEEN THEM. THE COMPUTER SIMULATIONS SUGGEST DIFFUSIVITIES DEPENDENT ON THE SIZE OF THE SIMULATED SYSTEM BUT WITH ANISOTROPY NEARLY INDEPENDENT OF THIS.
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Author :
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Cunha, Francisco Ricardo
Rosa, Otávio Luis
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Paper View :
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