Abo Bibliothek: Guest

ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

Bubble-tracking modeling of subcooled nucleate boiling in a vertical annulus

Get access (open in a dialog) DOI: 10.1615/IHTC12.1670
6 pages

Abstrakt

A three-dimensional bubble-tracking model ofsubcooled nucleate boiling in a vertical concentric annular channel with a central heating rod is presented. Vapor is distributed in the liquid in the form of individually tracked bubbles. The behavior of the liquid-vapor system results from motion, interaction and heat transfer mechanisms prescribed at the bubble level. The model takes into account bubble nucleation and liquid heating caused by wall heat flux, bubble sliding on the heated surface, bubble growing due to further evaporation, bubble lateral detachment from the heated surface, bubble radial migration towards the annulus outer wall, bubble interaction (through wake drift, collisions and coalescence), turbulent dispersion in the liquid phase and bubble condensation in the low-temperature liquid. Simulated radial profiles of void fraction and bubble Sauter diameter are compared with experimental results, which were obtained with water at near atmospheric pressure.