Heat loss by free convection from a horizontal pipe immersed in a liquid, estimate the rate of heat loss by free convection from a unit length of a long horizontal pipe, 6 in. in outside diameter, if the outer surface temperature is 100°F and the surrounding water is at 80°F. Compare the result with that obtained in Example 14.6-1, in which air is the surrounding medium. The properties of water at a film temperature of 90°F (or 32.3°C) are µ = 0.7632 cp, Cp = 0.9986 cal/g ∙ C and k = 0.363 Btu/hr ∙ ft ∙ F. Also, the density of water in the neighborhood of 90°F is

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T(C) 30.3 32.3 33.3 34.3 31.3 p(g/cm³) 0.99558 0.99528 0.99496 0.99463 0.99430