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Formation of bubbles from a single nucleation site

Cieśliński J., Polewski J., Szymczyk J.

Archives of Thermodynamics

2002

Vol. 23, no 3

59-77

A systematic study on nucleate pool boiling from single artificial nucleation site to saturated, distilled water and methanol under atmospheric pressure is reported. Electrically heated sections have been employed to produce vapour bubbles. The cavities were drilled on a flat end of the copper rod. The diameter of the cavities was 0.25 mm and 1.0 mm, and the depth was approximately 0.40 mm and 1.6 mm, respectively. Laser-photodiode system coupled with a digital oscilloscope or a PC-audio card has been utilised for measurement of release frequency. An exposure technique for measurement of bubble size has been developed. The images of the bubbles were recorded with a CCD video camera and analysed using a commercial software.