Multiphase flow with bubbles represents a fundamental and interdisciplinary domain within fluid dynamics, characterized by the complex interactions of gas, liquid, and sometimes solid phases. The presence of bubbles in a liquid medium can significantly influence flow properties, energy transfer, and reaction kinetics, making this field pivotal to both scientific inquiry and practical applications. This book explores bubble dynamics in multiphase flows, with a particular focus on their behavior under acoustic excitation and the cavitation phenomena in vapor/liquid/solid systems.