Oil at 50°F is heated in a horizontal 2-in. Schedule 40 steel pipe 60 ft long having a surface temperature of 120°F. The oil flow rate is 150 gal/h at inlet temperature. What will be the oil temperature as it leaves the pipe and after mixing? What is the average heat-transfer coefficient? Properties of the oil are given in Table 12.5.

Table 12.5

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TABLE 12.5 Data for Prob. 12.2 Specific gravity, 60°F/60°F Thermal conductivity, Btu/ft-h-"F Viscosity, CP Specific heat, Btu/lb-ºF 60°F 0.79 0.072 18 0.75 120°F 0.74 0.074 8 0.75