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Korea-Australia rheology journal v.22 no.1, 2010년, pp.65 - 73   SCIE
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Start-up times in viscoelastic channel and pipe flows

Miranda, A.I.P.    (Departamento de Matematica, Unidade de Materiais Texteis e Papeleiros, Universidade da Beira Interior   ); Oliveira, P.J.    (Departamento de Engenharia Electromecanica, Unidade de Materiais Texteis e Papeleiros, Universidade da Beira Interior  );
  • 초록

    Start-up times in viscoelastic channel and pipe flows generated by the sudden imposition of a pressure gradient are here determined by a mixed analytical/numerical procedure. The rheological models considered are the upper convected Maxwell and the Oldroyd-B equations. With these models the flow evolves asymptotically to the steady state solution after a transient regime presenting strong oscillations of the velocity fields, hence implying a special procedure for the calculation of the start-up time. This time interval required for establishment of steady flow tends to increase significantly with elasticity, at a constant rate of increase for the UCM model, but the increase becoming less than linear for the Oldroyd-B model. No wiggles or artificial oscillations were observed for the variation of the start-up times with the elasticity number.


  • 주제어

    start-up flow .   channel or pipe flow .   transient viscoelastic flow .   Oldroyd-B .   UCM.  

  • 참고문헌 (16)

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