The surface tension of water, a needed quantity in several of the following problems, is related to temperature according to the expression σ = 0.1232 [1 − 0.00146 T] , where σ is in N/m and T is in K. In the English system with σ given in lbf/ft and T in ?F, the surface tension may be calculated from σ = (8.44 × 10−3) [1 = 0.00082 T].
Two thousand watts of electrical energy are to be dissipated through copper plates measuring 5 cm by 10 cm by 0.6 cm immersed in water at 390 K. How many plates would you recommend? Substantiate all of the design criteria used.
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