Acoustic streaming in Maxwell fluids generated by standing waves in two-dimensional microchannels

In this work, a semianalytic solution for the acoustic streaming phenomenon, generated by standing waves in Maxwell fluids through a two-dimensional microchannel (resonator), is derived. The mathematical model is non-dimensionalized and several dimensionless parameters that characterize the phenomenon arise: the ratio between the oscillation amplitude of the resonator and the half-wavelength ( η=2A/λa ); the product of the fluid relaxation time times the angular frequency known as the Deborah number ( De=λ1ω ); the aspect ratio between the microchannel height and the wavelength ( ϵ=2H0/λa ); and the ratio between half the height of the microchannel and the thickness of the viscous boundary layer ( α=H0/δν ). In the limit when η≪1 , we obtain the hydrodynamic behaviour of the system using a regular perturbation method. In the present work, we show that the acoustic streaming speed is proportional to α2.65De1.9 , and the acoustic pressure varies as α6/5De1/2 . Also, we have found that the growth of inner vortex is due to convective terms in the Maxwell rheological equation. Furthermore, the velocity antinodes show a high dependency on the Deborah number, highlighting the fluid's viscoelastic properties and the appearance of resonance points. Due to the limitations of perturbation methods, we will only analyse narrow microchannels.