Superfluid Flow in a Venturi Tube

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Abstract
It is shown from Bernouilli's equation that a Venturi tube or Pitot tube as ordinarily used will have practically no level difference with irrotational fluids. A quantitative solution is given in the case of a Venturi tube of various dimensions. The observed level difference with water follows simply from the rotational acceleration term of the Navier‐Stokes equation. This result for irrotational fluids is discussed with respect to experiments using liquid helium and superconductors.

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