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S10 Fluidodināmica de Escoamento Multifįsico |
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Titulo:
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A MODIFIED ENTRAINMENT COEFFICIENT RELATION FOR THE DESCRIPTION OF THE COANDA EFFECT ON BUBBLE PLUMES
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Resumo :
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THIS PAPER DESCRIBES THE GAS FRACTION DISTRIBUTION IN THE TWO-PHASE FLOW OF A GAS-LIQUID BUBBLE PLUME SET TO DEVELOP ADJACENT TO ANOTHER BUBBLE PLUME. WHEN THIS HAPPENS, THE PLUME EXHIBITS A TYPE OF COANDA EFFECT, BENDING TOWARDS THE OTHER PLUME. THE LOCAL GAS FRACTION MEASUREMENTS ARE CARRIED OUT USING THE ELECTRO-RESISTIVITY PROBE TECHNIQUE IN AN AIR-WATER SYSTEM. THE DEFLECTION ANGLE OF THE PLUMES IS SHOWN TO PRESENT A LOGARITHMIC DEPENDENCE ON THE MODIFIED WEBER AND FROUDE NUMBERS OF THE FLOW. IN ADDITION, A SIMPLE THEORY BASED ON INTEGRAL METHODS IS ADVANCED FOR THE PREDICTION OF THE PLUME DEFLECTION; THE THEORY CONSIDERS A VARIABLE ENTRAINMENT COEFFICIENT.
KEY WORDS - BUBBLE PLUME, COANDA EFFECT, ENTRAINMENT COEFFICIENT. |
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Autores :
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Freire, Atila P. Silva
Menut, Philippe P. M.
Su, Jian 0
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Trabalho Completo :
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