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| Doughnuts being transported underneath a laminar flow of icing. |
I was craving some doughnuts today so I went by the doughnut shop. While I was there I saw the doughnut conveyer that moves the freshly made doughnuts under a laminar flow of icing. Once the icing completely glazes the doughnut it almost immediately changes phases. This is because the diameter of the glaze on the doughnut is very small compared to the diameter of the icing waterfall and heat transfers more readily across small diameters. Icing has a very high thermal diffusivity making the rate of heat transferring out of the icing very high. This fluid property explains why a heater is required to keep the icing liquid when it is in the transportation process at the doughnut shop.
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