I would like to make an ice cream machine for home use. That is a mixing bowl which can be stored in the freezer over night and then keeps cold long enough to freeze the ingredients while mixing them.
At first I thought I would just wrap a mixing bowl in commercial cooling packs, but apparently, in the hard shell cooling packs, they often simply use water. Now I would like to come up with a more fancy design.
My idea would be to get a long copper pipe and bend it around my cooling bowl. After bending, it would be like a long spiral around the bowl. At one end, I would plug it shut, then it's filled with water and with a bit of air left, the other end is plugged.
Would the pressure from freezing water be enough to unbend the copper? Do you have ideas on fastening the copper spiral?