Heat transfer and flow pattern at a cylinder impinged by a slot jet during incipient and nucleate boiling

Abstract

The heat transfer due to a submerged slot jet of water impinging on a circular cylinder in cross flow was experimentally studied in the region of incipient and fully developed nucleate boiling. The diameter of the cylinder and the width of the jet are the same—namely, 3 mm. The heat flux ranged from 4 × 10 4 to 1.5 × 106 W/m 2. The effects of the jet velocity and of the fluid subcooling were investigated in the range 0.37 < ν < 1.11 m/s and 0 < (ΔT) sub <_ 15 K both in upward and downward flow. The results showed that the influence of these parameters is limited to the region of incipient boiling, whereas, in fully developed boiling, all the boiling curves merge into a single one. A photographic study of the bubble flow pattern evidenced a different behavior with respect to cylinders in uniform cross flow.