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Elastic Orbital Angular Momentum.

G J Chaplain1, J M De Ponti2, R V Craster3,4,5

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Summary
This summary is machine-generated.

Guided elastic waves in pipes possess orbital angular momentum. This momentum can be transferred to surrounding fluid acoustic fields through wave coupling, as shown by numerical simulations.

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Area of Science:

  • Physics
  • Acoustics
  • Wave Mechanics

Background:

  • Elastic waves in pipes can exhibit complex behaviors.
  • Orbital angular momentum is a fundamental property of waves, typically associated with light.

Purpose of the Study:

  • To identify and demonstrate the transfer of orbital angular momentum in elastic waves within pipes.
  • To explore the coupling mechanism between pipe wave potentials and surrounding fluid acoustic fields.

Main Methods:

  • Theoretical identification of orbital angular momentum in flexural guided elastic waves.
  • Numerical demonstration of elastic orbital angular momentum transfer.
  • Analysis of wave coupling between compressional potential in pipes and acoustic pressure in fluids.

Main Results:

  • Flexural guided elastic waves in elastic pipes carry orbital angular momentum linked to the compressional dilatational potential.
  • Elastic orbital angular momentum transfer from pipe waves to surrounding fluid acoustic fields was numerically confirmed.
  • The coupling mechanism involves the interaction of the pipe's compressional potential with the fluid's acoustic pressure.

Conclusions:

  • Orbital angular momentum is a property of guided elastic waves in pipes.
  • This phenomenon enables the transfer of elastic orbital angular momentum to acoustic fields in adjacent fluids.
  • The findings open new avenues for manipulating acoustic energy and momentum transfer.