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SR27 Transferência de Calor e Massa |
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Title:
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ANALYTICAL PREDICTION OF FRICTION FACTORS AND HEAT TRANSFER COEFFICIENTS OF TURBULENT FORCED CONVECTION IN ROD BUNDLES WITH SURFACE ROUGHNESS
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Summary :
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IN THE PRESENT WORK, A SIMPLE ANALYTICAL METHOD IS DEVELOPED FOR THE PREDICTION OF THE FRICTION FACTOR, F, AND OF THE HEAT TRANSFER COEFFICIENT, C_H, FOR TURBULENT FLOWS BETWEEN RODS ARRANGED IN HEXAGONAL OR SQUARE ARRAYS. THE CASES OF FLOW OVER A SMOOTH SURFACE AND OVER A ROUGH SURFACE ARE STUDIED. DIFFERENT FORMS OF THE LAW OF THE WALL FOR THE VELOCITY AND THE TEMPERATURE FIELDS ARE INTEGRATED OVER THE WHOLE FLOW REGION TO RESULT IN ALGEBRAIC EQUATIONS FOR THE DETERMINATION OF F AND OF C_H . THE METHOD IS APPLIED TO ARRANGEMENTS WITH P/D<1.3.
KEY WORDS: ROD BUNDLE, TURBULENT FLOW, FRICTION FACTOR, HEAT TRANSFER COEFFICIENT, SURFACE ROUGHNESS.
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Author :
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Avelino, Mila Rosendal
Freire, Atila P. S.
Su, Jian 0
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Paper View :
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