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SR27 Transferência de Calor e Massa |
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Title:
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HEAT TRANSFER IN DEVELOPING FLOW OF VISCOPLASTIC MATERIALS THROUGH ANNULAR SPACES
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Summary :
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HEAT TRANSFER IN THE ENTRANCE-REGION LAMINAR FLOW OF VISCOPLASTIC MATERIALS INSIDE ANNULAR SPACES IS ANALYZED, AIMING AT APPLICATIONS RELATED TO THE DRILLING PROCESS OF PETROLEUM WELLS. THE MATERIAL IS ASSUMED TO BEHAVE AS A GENERALIZED NEWTONIAN LIQUID, WITH A HERSCHEL-BULKLEY VISCOSITY FUNCTION. THE
GOVERNING EQUATIONS ARE SOLVED NUMERICALLY VIA A FINITE VOLUME METHOD. TWO BOUNDARY CONDITIONS WERE ANALYZED: CONSTANT WALL HEAT FLUXES AND CONSTANT WALL TEMPERATURES. THE EFFECT OF YIELD STRESS AND POWER-LAW EXPONENT ON THE NUSSELT NUMBER IS INVESTIGATED. IT IS SHOWN THAT THE ENTRANCE LENGTH DECREASES AS THE MATERIAL BEHAVIOR DEPARTS FROM NEWTONIAN. |
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Author :
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Naccache, Mônica Feij?br>
Soares, Edson Jos?br>
Souza Mendes, Paulo Roberto
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Paper View :
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