title: An exploration in acoustic radiation force experienced by cylindrical shells via resonance scattering theory.
abstract: In nonlinear acoustic regime, a body insonified by a sound field is known to experience a steady force that is called the acoustic radiation force (RF). This force is a second-order quantity of the velocity potential function of the ambient medium. Exploiting the sufficiency of linear solution representation of potential function in RF formulation, and following the classical resonance scattering theorem (RST) which suggests the scattered field as a superposition of the resonant field and a background (non-resonant) component, we will show that the radiation force is a composition of three components: background part, resonant part and their interaction. Due to the nonlinearity effects, each part contains the contribution of pure partial waves in addition to their mutual interaction. The numerical results propose the residue component (i.e., subtraction of the background component from the RF) as a good indicator of the contribution of circumferential surface waves in RF. Defining the modal series of radiation force function and its components, it will be shown that within each partial wave, the resonance contribution can be synthesized as the Breit-Wigner form for adequately none-close resonant frequencies. The proposed formulation may be helpful essentially due to its inherent value as a canonical subject in physical acoustics. Furthermore, it may make a tunnel through the circumferential resonance reducing effects on radiation forces.
authors: Department of Mechanical Engineering, Sharif University of Technology, Azadi Avenue, Tehran, Iran.
authors: Majid
authors: M
authors: Rajabi
authors: Department of Mechanical Engineering, Sharif University of Technology, Azadi Avenue, Tehran, Iran. Electronic address: m_behzad@sharif.ir.
authors: Mehdi
authors: M
authors: Behzad
keywords: Negative Radiation Force (NRF); Radiation force function; Resonance isolation; Resonance scattering theorem (RST); Surface waves