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How might helium rain help heat Saturnā€™s interior?

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Saturn
Saturn Saturn and its spectacular rings, in a natural-color composite of 126 images taken by the Cassini spacecraft on October 6, 2004. The view is directed toward Saturn's southern hemisphere, which is tipped toward the Sun. Shadows cast by the rings are visible against the bluish northern hemisphere, while the planet's shadow is projected on the rings to the left.

In the interior of Saturn, the process of helium rain is a leading theory to explain the planet's internal heat source, which causes it to radiate more energy than it receives from the Sun.1

As the planet cools, helium is thought to precipitate out of the solution of hydrogen in which it is dissolved. This helium forms dense droplets that "rain" downward toward the planet's deeper, metallic interior.1

This process generates heat through the following mechanism:
* Conversion of Energy: As the dense helium droplets fall, their potential energy is converted into kinetic energy due to their motion.1
* Friction and Heat: The motion of these droplets is damped by friction, which converts that kinetic energy into heat.1
* Convection: This generated heat is then transported upward to the atmosphere via convection, where it is eventually radiated into space.1

This internal heating mechanism helps account for why Saturn continues to radiate significant energy despite being less massive than Jupiter.1