In the situation of an ice cube placed in water and eventually melting, it is supposed that natural convection is the process in which heat transfer from water to ice occurs.
However, natural convection in this situation requires a continuous replacement of water particles near the ice cube to transfer energy to the ice particles, as the water particles that transfer energy - lose their energy, and in the process increase in density. Or so, I thought.
But actually since the density of ice is less than water’s, this means that the energy depleted particles near the ice cube actually decreases in density.
So my question is, how is natural convection possible in this case?
Do the water particles move up in this case instead of sinking?