The manuscript presents an experimental study of inclination and pin-finned surfaces on nucleate boiling in FC-72 of saturated 50°C. The orientation angle of test surface from horizontal plane was varied from 0° (upper surface) to 90° (vertical surface). The boiling surfaces include a plain surface, a straight surface (C-0.2-0.5) and a pin-finned surface (P-0.2-0.5), whose fin width, fin height, and fin gap are 0.2mm, 0.5mm and 0.2mm. The effect of the surface inclination angle is notable at the increasing heat flux tests, while no marked effect is observed at the decreasing heat flux tests. With 10K superheat, the straight fin surface(C-0.2-0.5) and pin-finned surface (P-0.2-0.5) enhanced the boiling performance by approximately 6.7 and 7.5 folds, respectively. The enhancement is attributed to the increased surface area, the increased nucleation sites and the proper fin and gap widths.

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