Rheology pp 47-52 | Cite as

On Non-Newtonian Flow Through a Slit Plate

  • Kitaro Adachi
  • Naoya Yoshioka


The flow through a two-dimensional orifice, i.e., a slit plate, in a two parallel plate channel involves two flow geometries of conversion and diversion. Both of them are widespread and important in the polymer processing of extrusion and injection mouldings. Therefore, there has been much discussion. Giesekus1,2 paid attention to the remarkable difference in the flow pattern between the converging flow and the diverging flow although the corresponding, creeping flow of a Newtonian fluid has a symmetric flow pattern on both the sides of the orifice plane. That asymmetry is one of the characteristic features of viscoelastic behaviors, as is also seen in the flow past a sphere.3 Most existing studies have been directed to the converging, entry flow in connection with the elongational flow, but the diverging, exit flow is also important. Thus, it would be interesting to correlate the pressure drop with the related flow pattern in each flow region, or, at least, to divide the additional pressure drop due to the existence of the orifice plate into the entrance and exit portions, if possible. Further points to be made clear are the difference in the pressure drop between the 2-dimensional, plane flow through a slit plate and the 3-dimensional, axisymmetric flow through an orifice, the critical condition for the onset of the steady oscillating flow, its period, and the change in the pressure drop with the onset of viscoelastic flow disturbances. The present work will be more or less concerned with these points.


Pressure Drop Orifice Plate Elongational Flow Sodium Polyacrylate Flow Visualization Experiment 
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Copyright information

© Springer Science+Business Media New York 1980

Authors and Affiliations

  • Kitaro Adachi
    • 1
  • Naoya Yoshioka
    • 1
  1. 1.Department of Chemical EngineeringKyoto UniversityKyoto, 606Japan

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