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].
Four immersion heaters in the shape of cylinders 15 cm long and 2 cm in diameter are immersed in a water bath at 1 atm total pressure. Each heater is rated at 500 W. If the heaters operate at rated capacity, estimate the temperature of the heater surface. What is the convective heat-transfer coefficient in this case?
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