A circular disk of radius r is used in an evaporator and
Chapter , Problem 14(choose chapter or problem)
A circular disk of radius r is used in an evaporator and is rotated in a vertical plane. If it is to be partially submerged in the liquid so as to maximize the exposed wetted area of the disk, show that the center of the disk should be positioned at a height rys1 1 2 above the surface of the liquid.
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