.. _sphx_glr_api_gallery_fluid_engineering_momentum:

Momentum
--------

Forces from turning a stream: jets, vanes and pipe bends.


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  <div id='sg-tag-list' class='sphx-glr-tag-list'></div>


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    <div class="sphx-glr-thumbnails">

.. thumbnail-parent-div-open

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    <div class="sphx-glr-thumbcontainer" tooltip="Lester Pelton, a millwright in the California gold country, patented in 1880 a wheel whose buckets split the jet in two and turn each half almost back on itself. By the momentum equation a vane that turns a jet through \theta is pushed with \rho A (V - u)^2 (1 - \cos\theta) (~engineeringkit.fluid_engineering.jet_force); a wheel, which always has a bucket in the jet, takes \rho Q u (V - u)(1 - \cos\theta) (~engineeringkit.fluid_engineering.pelton_wheel_power). Turning the jet through nearly 180° and running the buckets at half the jet speed leaves the water with almost no speed at all. This example compares Pelton&#x27;s buckets with the flat paddles of the hurdy-gurdy wheels they replaced.">

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  .. image:: /api/gallery/fluid_engineering/momentum/images/thumb/sphx_glr_plot_01_pelton_wheel_thumb.png
    :alt:

  :doc:`/api/gallery/fluid_engineering/momentum/plot_01_pelton_wheel`

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      <div class="sphx-glr-thumbnail-title">Pelton's water wheel (1880)</div>
    </div>


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    </div>


.. toctree::
   :hidden:

   /api/gallery/fluid_engineering/momentum/plot_01_pelton_wheel