surely the blocks especially the storm are not cooling by convection but by conduction (yes i know nitpicky). I would of thought the whole point of the storm is to increase reynolds number levels and provide a nice thick v tubulent ther.mal boundary layer for heat to transfer to. Certainly the dimensions of the storm block inducate that water is mostly movin in the thermal boundary layer region.
Linky about thermal boundary (bring ur text book)
http://scienceworld.wolfram.com/phys...daryLayer.html