HEAT TRANSFER FROM FIN-TUBE RADIATORS.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO
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A FORTRAN language computer program is developed to calculate the radiation heat transfer characteristics of circular tubes with longitudinal fins. Mutual irradiation effects between the tubes and the fin are included. Arbitrary fin emissivity, fin thickness, and tube emissivity are also allowed in the program. The results indicate that the fin thickness effects are practically negligible and that, for equal fin and tube emissivities, the overall fin-tube efficiency is not proportional to the emissivity. For example, using for reference the black surface results, the use of an efficiency proportional to the emissivity would result in underestimating the efficiency by 14.4 percent in the case of a tube radius to fin length ratio of 1.0 and a fin-tube emissivity of 0.5. Author