The Bjerknes force is a concept in fluid dynamics that describes the interaction between sound waves and particles (such as droplets or bubbles) in a fluid. It is named after the Norwegian scientist Henrik Bjerknes. The force arises when an object is subjected to an oscillating pressure field, such as that generated by sound waves. In essence, as pressure waves travel through a fluid, they exert a differential pressure on the surface of an object due to the object's shape and size.
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