Self radiation force on a moving monopolar source

TL;DR

This paper investigates how the motion of a monopolar acoustic source affects the radiation force it experiences, revealing that Doppler-induced asymmetry in emitted waves causes a force opposing its movement.

Contribution

It introduces a novel analysis of the radiation force on a moving monopolar source, accounting for Doppler effects neglected in previous steady-state models.

Findings

Doppler effect causes asymmetry in emitted acoustic field.

The radiation force opposes the source's motion.

Motion induces a measurable radiation force on the source.

Abstract

The radiation force exerted on an object by an acoustic wave is a widely studied phenomenon since the early work of Rayleigh, Langevin and Brillouin and has led in the last decade to tremendous developments for acoustic micromanipulation. Despite extensive work on this phenomenon, the expressions of the acoustic radiation force applied on a particle have so far been derived only for a steady particle, hence neglecting the effect of its displacement on the radiated wave. In this work we study the acoustic radiation force exerted on a monopolar source translating at a constant velocity small compared to the sound speed. We demonstrate that the asymmetry of the emitted field resulting from Doppler effect induces a radiation force on the source opposite to its motion.