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Title

MIXING ANALYSIS OF NON-NEWTONIAN FLUIDS IN DIFFERENT SERPENTINE MICRO-CHANNELS

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Abstract

 NUMERICAL SIMULATIONS HAVE BEEN CARRIED OUT TO INVESTIGATE THE MIXING BEHAVIOR IN THE DIFFERENT SERPENTINE MICRO-CHANNELS WITH NON-NEWTONIAN FLUIDS USING SHEAR-DEPENDENT VISCOSITY MODELS. THE CARREAU-YASUDA AND QUEMADA NON-NEWTONIAN VISCOSITY MODELS HAVE BEEN USED. SINUSOIDAL-SHAPE, STEP-SHAPE AND ZIGZAG-SHAPE HAVE BEEN USED AS THREE DIFFERENT SERPENTINE MODELS. 3-D GOVERNING EQUATIONS, CONTINUITY, MOMENTUM AND SPECIES EQUATIONS HAVE BEEN SOLVED WITH FLUENT SOFTWARE. RESULTS SHOW IN THE SINUSOIDAL-SHAPE, VERY BETTER MIXING ACHIEVED THAN STRAIGHT LENGTH MICRO-CHANNEL FOR BOTH NON-NEWTONIAN MODELS. ALSO, IN THE SINUSOIDAL-SHAPE, BETTER MIXING REPRESENTED THAN ZIGZAG-SHAPE AND MIXING INDEX IN ZIGZAG-SHAPE IS HIGHER THAN STEP-SHAPE. ON THE OTHER HAND, IN ALL THREE MODELS, FIRSTLY WITH INCREASING MASS FLOW RATE, MIXING INDEX DECREASES. BUT FOR MASS FLOW RATE HIGHER THAN ABOUT 2´10-6 KG/S, WITH INCREASING MASS FLOW RATE, MIXING INDEX INCREASES. ALSO, AT LOW MASS FLOW RATE, THERE IS NO DIFFERENCE IN MIXING INDEX FOR CARREAU-YASUDA AND QUEMADA NON-NEWTONIAN VISCOSITY MODELS, BUT WITH INCREASING MASS FLOW RATE, MIXING INDEX FOR CARREAU-YASUDA MODEL IS HIGHER THAN QUEMADA MODEL.

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