Flow Field around Growing and Rising Vapour Bubble by PIV Measurement

Article type: Research Article

Authors: Cieslinski, J. T. | Polewski, J. | Szymczyk, J. A.

Affiliations: Gdansk University of Technology, Narutowicza 11/12, 80952 Gdansk, Poland. E-mail: jcieslin@pg.gda.pl | Klüber Lubrication Polska/Poland | FH Stralsund, Zur Schwedenschanze 15, 18435 Stralsund, Germany

Abstract: A study on flow field measurement around growing and rising vapour bubbles by use of PIV technique is presented. Bubbles were generated from single artificial cavities. Experiments have been conducted with saturated boiling of distilled water at atmospheric pressure. In the experiment fluid velocity field surrounding the bubbles was visualized by use of polyamide tracer particles and a sheet of a YAG pulse laser beam. The images were recorded with a cross-correlation CCD-camera. It has been shown that for lower heat flux density bubble growths in an almost quiescent bulk of liquid. For higher heat flux density the train of bubbles creates a vapour column with strong wake effect. Maximum liquid velocity recorded is approximately equal to the terminal velocity of bubble rising in a stagnant liquid.

Keywords: Pool boiling, Bubble growth, PIV

Journal: Journal of Visualization, vol. 8, no. 3, pp. 209-216, 2005