What kind of interaction exists between clumped particles and particles moving freely through the solution?

There is an interaction called intermolecular forces.

Explanation:

Intermolecular forces are the forces exerted to hold together two or more molecules. They correspond to chemical bonds that have the function of binding or repelling the molecules of a compound.

In the case described in the question, the intermolecure forces would act by imposing a force of attraction between the molecules that would make those particles that move freely if they "stick" to the clumped particles.

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i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.