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SR26 Reologia |
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Title:
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HEAT TRANSFER OF SIMPLIFIED PHAN-THIEN—TANNER FLUIDS IN PIPES AND CHANNELS
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Summary :
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ABSTRACT. THE RHEOLOGY OF SOME CONCENTRATED SOLUTIONS OF POLYMERS AND POLYMER MELTS IS PREDICTED ADEQUATELY BY THE PHAN-THIEN—TANNER (PTT) CONSTITUTIVE EQUATION (LARSON, 1988, QUINZANI ET AL, 1995). SUCH MODEL FLUIDS ARE FREQUENTLY USED TO SIMULATE REAL FLUIDS ENCOUNTERED IN INDUSTRY, IN PROCESSES INVOLVING HIGH TEMPERATURES AND HEAT TRANSFER OPERATIONS, AND ARE ALSO USEFUL TO ASSESS THE PERFORMANCE OF NUMERICAL CODES.
FOR THE SIMPLIFIED VERSION OF THE PTT FLUID MODEL, AN EXACT SOLUTION IS DERIVED FOR THERMAL AND HYDRODYNAMIC FULLY-DEVELOPED PIPE AND CHANNEL FLOWS. THE ANALYSIS CONSIDERS A CONSTANT WALL HEAT FLUX BOUNDARY CONDITION AND SHOWS THAT FLUID ELASTICITY IS RESPONSIBLE FOR AN ENHANCEMENT IN HEAT TRANSFER OF AT MOST 15.8% FOR THE PIPE FLOW AND OF 11.1% FOR THE CHANNEL FLOW.
KEYWORDS: VISCOELASTIC, PHAN-THIEN—TANNER MODEL, HEAT TRANSFER ENHANCEMENT, PIPE FLOW |
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Author :
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Oliveira, Paulo Jorge Pimentel
Pinho, Fernando Tavares
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Paper View :
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