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S10 Fluidodināmica de Escoamento Multifįsico |
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Title:
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FLUID DYNAMIC INVESTIGATION OF DILUTE AND DENSE PHASE FLOW IN A PNEUMATIC TUBE WITH A SPOUTED BED TYPE SOLID FEEDING SYSTEM
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Summary :
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THE PURPOSE OF THIS WORK IS TO IMPROVE THE CHARACTERIZATION OF THE DIFFERENT CONVEYING REGIMES FOR VERTICAL PNEUMATIC TRANSPORT WITH A SPOUTED BED FEEDER USING THE PRESSURE GRADIENT DIAGRAMS. THE RANGE OF EXPERIMENTAL DATA INVESTIGATED WERE EXPANDED BY CARRYING OUT MEASUREMENTS OF PRESSURE GRADIENTS, MEAN VOIDAGES, AND SOLID FLOW RATES FOR TWO TRANSPORT TUBE DIAMETERS (81.4 AND 104.8 MM) AND DIFFERENT PARTICLE DIAMETERS (FROM 0.41 TO 1.70 MM). TWO DIFFERENT TRANSPORT REGIMES HAVE BEEN OBSERVED: A DILUTE AND A DENSE PHASE FLOW. THE VALIDITY OF ONE-DIMENSIONAL MODEL TO PREDICT THE PRESSURE GRADIENT ON DILUTE AND DENSE PHASE FLOW REGIMES WAS ANALYZED BY COMPARING THE PREDICTIONS WITH EXPERIMENTAL VALUES. THE RESULTS SHOWED THAT THE ONE-DIMENSIONAL MODEL IS NOT SENSITIVE TO THE CHANGES IN FLOW REGIMES DETECTED IN THE PRESSURE DIAGRAMS. FINALLY, A COMPARISON OF THE SPECIFIC POWER CONSUMPTION AT DIFFERENT OPERATIONAL CONDITIONS IS PRESENTED. ALTHOUGH THE ESTIMATED VALUES OF SPECIFIC POWER CONSUMPTION WERE HIGH, IT WAS NOT DETECTED A REDUCTION IN THESE VALUES FOR DENSE PHASE CONDITIONS.
KEYWORDS: PNEUMATIC CONVEYING, FLOW REGIMES, SPOUTED BED FEEDER
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Author :
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Costa, Ione Andriani
Ferreira, Maria do Carmo 0
Freire, Jos?Teixeira
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Paper View :
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