EXPERIMENTAL STUDY OF AXIAL FLOW THROUGH AND ANNULAR REGION WITH INNER CYLINDER ROTATION / ESTUDO EXPERIMENTAL DO ESCOAMENTO AXIAL ATRAVÉS DE REGIÃO ANULAR COM ROTAÇÃO DO CILINDRO INTERNO

AUTOR(ES)

JULIO MANUEL BARROS JUNIOR

DATA DE PUBLICAÇÃO

2007

RESUMO

The flow between concentric cylinders with an inner rotating cylinder with an imposed pressure-driven axial flow was studied experimentally. The radius ratio was (n) = 0, 64 and the aspect ration was (r) = 265. Friction factor and velocity fields were studied for four rotations of the inner cylinder and for laminar, transitional, and turbulent flow. Velocity fields were measure by Particle Image Velocimetry (PIV). The results for friction factor showed that the influence of the rotation is more apparent for laminar and transitional flow, increasing with the rotation of the inner cylinder. For these two flows, the increasing was 100% of f/f0. For turbulent flow, the increasing was gradualy decreasing to 10% of f/f0 for Reaxial = 8458. Instantaneous velocity fields showed complex flow patterns. The time average axial velocity profiles showed a top hat like form with the increasing of inner cylinder rotation and axial Reynolds numbers. For turbulent flow, the influence of rotation in the velocity profiles was small.

ASSUNTO(S)

piv escoamento axial queda de pressao axial flow fator de atrito pressure drop factor of attrition piv

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