Particle impurities deposition on solid surfaces can destabilize the matrix material. Moving bubbles can remove particles without damaging the matrix material. In this study, CaCO 3 particles were utilized to simulate impurities, and samples were prepared using a deposition method. The effects of bubble-particle interactions were assessed by analyzing the gray value of the sample surface. Prolonging bubble exposure and tilting the granular sample at 30°-45° effectively removed surface particles. Finite element simulations indicate that particle removal results from the combined actions of bubble impact stress, bubble surface tension, and fluid shear force. This study deepens the understanding of the bubble cleaning principle and lays a theoretical foundation for the development of more efficient cleaning technology.
Wang et al. (Tue,) studied this question.