  Most of the current applications of acoustic cavitation use bubble clusters
that exhibit multibubble dynamics. This necessitates a complete understanding
of the mutual nonlinear coupling between individual bubbles. In this study,
strong nonlinear coupling is investigated in bubble pairs which is the simplest
case of a bubble-cluster. This leads to the derivation of a more comprehensive
set of coupled Keller-Miksis equations (KMEs) that contain nonlinear coupling
terms of higher order. The governing KMEs take into account the convective
contribution that stems from the Navier-Stokes equation. The system of KMEs is
numerically solved for acoustically excited bubble pairs. It is shown that the
higher order corrections are important in the estimation of secondary Bjerknes
force for closely spaced bubbles. Further, asymmetricity is witnessed in both
magnitude and sign reversal of the secondary Bjerknes force in weak, regular,
and strong acoustic fields. The obtained results are examined in the light of
published scientific literature. It is expected that the findings reported in
this paper may have implications in industries where there is a requirement to
have a control on cavitation and its effects.
