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].
If eight tubes of the size designated in Problem 21.13 are arranged in a vertical bank and the flow is assumed laminar, determine
a. the average heat-transfer coefficient for the bank
b. the heat-transfer coefficient for the first, third, and eighth tubes
Problem 21.13
Saturated steam at 365 K condenses on a 2-cm tube whose surface is maintained at 340 K. Determine the rate of condensation and the heat transfer coefficient for the case of a 1.5-m-long tube oriented
a. vertically
b. horizontally
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