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Mysterious lift of drill in downwards water flow

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I learned of a very interesting and paradoxical looking phenomenon. Thankd for Shamoon Ahmed for the link. A drill with a helical geometry raises in a downwards fluid flow (see this) This is in conflict with the naive expectations.

  1. Suppose that momentum is conserved. By momentum conservation water must get downwards directed momentum if the drill obtains upwards directed momentum. If there is no slipping, just the opposite should happen. Therefore the situation could be like in a turbulent flow: the water and the drill do not directly touch each other. There is indeed turbulence as one can see. But what makes possible the slipping. It has been quite recently learned that the surface of water in air has thin ice-like layer for which TGD suggests and explanation (see”>this). The surface between drill and water would be covered by a very thin ice layer so that slipping would take place naturally. Drill is like a skater.
  2. Is the momentum really conserved? Water is accelerated in the gravitational field: this gives it momentum. The downwards kinematic pressure, which increases downwards, pushes the drill having a helical geometry. If there is no friction fixing the drill to water flow, the drill has no other option than raise. The constraint due to helicality forces the drill to rotate. By angular local momentum conservation, water must rotate in the opposite direction. Vortex is generated.

    Water in the vortex and drill would rotate in opposite directions and helicality constraint would transform the rotational motion of the drill to a translational motion and forces the rotation of drill to gain upwards directed momentum.

  3. This raises some questions.
    1. Could there be a connection with the fact that in the Northern/Southern hemisphere water flowing in a water tub rotates in a unique direction (kind of parity breaking)?
    2. What is the role of the handedness of the drill? One would expect that the drill with an opposite handedness rotate in an opposite direction? What if the handedness of the drill does not favor the natural rotation direction for the vortex? Do these effects tend to cancel.

See the article TGD Inspired Model for Freezing in Nano Scales and the chapter TGD and Quantum Hydrodynamics.

For a summary of earlier postings see Latest progress in TGD.

For the lists of articles (most of them published in journals founded by Huping Hu) and books about TGD see this.


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