, Volume 40, Issue 1, pp 49–63 | Cite as

Start-up Flow of a Bingham Fluid in a Pipe



We present an analytical solution of axisymmetric motion for a Bingham fluid initially at rest subjected to a constant pressure gradient applied suddenly. Using the Laplace transform, we obtain expressions which allow the calculation of the instantaneous velocity, plug radius and rate of flow as a function of time. We also give a relation for the shear stress in the plug and in the region where the behaviour of the fluid is Newtonian.


Bingham fluid Unsteady flow Pipe flow Fluid mechanics 


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Copyright information

© Springer 2005

Authors and Affiliations

  1. 1.DISTART – University of BolognaBolognaItaly

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