(a) Compare the film coefficients for heat transfer to water and to oil flowing at 1 m/s in a 10-cm pipe at about 50°C. Assume the oil has the properties given in Table 12.5.

(b) Show that the ratio h_water/h_oil is the product of several factors that are based on physical property ratios.

Table 12.5

Transcribed Image Text:

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-"F 60°F 0.79 0.072 18 0.75 120°F 0.74 0.074 8 0.75