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S10 Fluidodināmica de Escoamento Multifįsico |
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Title:
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ACCELERATION OF CORK STOPPERS IN PNEUMATIC CONVEYING
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Summary :
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ABSTRACT. IN THE CORK STOPPERS INDUSTRY SHORT DISTANCE PNEUMATIC CONVEYING IS COMMONLY USED IN SEVERAL PHASES OF THE MANUFACTURING PROCESS. SYSTEMS HAVE BEEN DEVELOPED PURELY ON AN EMPIRICAL BASIS AND UNTIL TWO YEARS AGO NO SYSTEMATIC APPROACH TO THE STUDY OF THIS PROBLEM HAD BEEN UNDERTAKEN. SINCE THEN, SOME EXPERIMENTAL WORK WAS CARRIED OUT MAINLY ON STEADY STATE HORIZONTAL PNEUMATIC CONVEYING OF CORK STOPPERS AND SHED SOME LIGHT ON THE PRESSURE DROP EVOLUTION IN THIS PROCESS. HOWEVER, TRANSPORTATION DISTANCES USUALLY FOUND IN THE PNEUMATIC CONVEYING OF CORK STOPPERS ARE SHORT AND INDUSTRIAL APPLICATIONS ARE ESSENTIALLY UNDER UNSTEADY-STATE CONVEYING REGIMES. THE PRESENT PAPER REPORTS AN EXPERIMENTAL STUDY OF THE ACCELERATION REGIME FOR HORIZONTAL CONVEYING CONDITIONS PRESENTING DATA ON THE PRESSURE DROP EVOLUTION AND ACCELERATION LENGTH FOR TWO STOPPERS SIZES AND SEVERAL LOADING CONDITIONS. CORRELATIONS FOR THE PRESSURE DROP AND ACCELERATION LENGTH ARE PRESENTED AS FUNCTION OF SOLIDS LOAD FACTOR, GAS AND SOLID DENSITY RATIO, PARTICLE AND DUCT SIZE RATIO AND FROUD NUMBER.
KEYWORDS: PNEUMATIC CONVEYING, GAS-SOLID FLOW, ACCELERATION REGIME.
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Author :
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Pinho, Carlos 0
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Paper View :
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COBEM99
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