.. _sphx_glr_api_gallery_fluid_engineering_viscous:

Viscous flow
------------

Exact laminar solutions between moving walls.


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    <div class="sphx-glr-thumbcontainer" tooltip="Maurice Couette, in his 1890 thesis at Paris, measured the viscosity of water in the narrow gap between a fixed inner cylinder and a rotating outer one, from the torque on the inner cylinder. Rotating the outer cylinder keeps the flow laminar to high speeds. For a narrow gap the flow is the plane shear flow between a fixed and a sliding plate, with a straight velocity profile and uniform stress \mu U/h (~engineeringkit.fluid_engineering.couette_velocity, couette_shear_stress); the exact torque for any gap is couette_viscometer_torque. This example reads a viscosity back from a torque and adds a pressure gradient to the plane flow.">

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  .. image:: /api/gallery/fluid_engineering/viscous/images/thumb/sphx_glr_plot_01_couette_viscometer_thumb.png
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  :doc:`/api/gallery/fluid_engineering/viscous/plot_01_couette_viscometer`

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      <div class="sphx-glr-thumbnail-title">Couette's rotating-cylinder viscometer (1890)</div>
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    </div>


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   /api/gallery/fluid_engineering/viscous/plot_01_couette_viscometer