I assume so the liquid moves around and gets cooled evenly. If you didn’t move the drink, the outer layer of liquid would get cold, but the inside would take longer to get cold as well
Technically not by convection because that is the movement of fluid to transfer heat in and out of something, like air conditioning. The bath is not a moving fluid it is a simple constant temperature. The spinning moves the fluid inside the can so more of it touches the aluminum wall, which is being cooled by conduction with the ice bath.
why the roll?
Probably to disrupt the temperature gradient that forms around the can. That’s why we blow air on though the top of a hot drink to cool it faster.
I assume so the liquid moves around and gets cooled evenly. If you didn’t move the drink, the outer layer of liquid would get cold, but the inside would take longer to get cold as well
cause it looks cooler
Heat transfer by convection
Technically not by convection because that is the movement of fluid to transfer heat in and out of something, like air conditioning. The bath is not a moving fluid it is a simple constant temperature. The spinning moves the fluid inside the can so more of it touches the aluminum wall, which is being cooled by conduction with the ice bath.