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SR26 Reologia |
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Title:
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BULK CHARACTERISTICS OF SOME VARIABLE VISCOSITY POLYMER SOLUTIONS IN
TURBULENT PIPE FLOW
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Summary :
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ABSTRACT. AS PART OF A RESEARCH PROGRAMME ON WALL-FREE TURBULENT FLOWS OF NON-NEWTONIAN FLUIDS, AQUEOUS SOLUTIONS OF THREE DIFFERENT POLYMERS HAVE BEEN EXTENSIVELY INVESTIGATED IN TERMS OF THEIR FRICTIONAL PRESSURE DROP VERSUS FLOW RATE CHARACTERISTICS, AFTER A CAREFULL PROCESS OF FLUID SELECTION AND RHEOLOGICAL CHARACTERISATION REPORTED ELSEWHERE (PEREIRA AND PINHO, 1994 AND COELHO AND PINHO, 1998). ALL SOLUTIONS, AND IN PARTICULAR THOSE OF CMC AND MORE SO OF XANTHAN GUM, EXHIBITED DRAG REDUCTION. THE TOTAL DRAG REDUCTION WAS SEPARATED INTO SHEAR-THINNING (DRV) AND ELASTIC (DRE) CONTRIBUTIONS, WITH DRV REACHING A MAXIMUM OF ABOUT 30% OF THE TOTAL FOR THE THICKEST XANTHAN GUM SOLUTIONS.
KEYWORDS: DRAG REDUCTION; PIPE FLOW
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Author :
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Pereira, Américo Sá
Pinho, Fernando Tavares
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Paper View :
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