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ISSN Online: 2377-424X

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

Direct numerical simulation of pool and forced convective flow boiling phenomena

Get access (open in a dialog) DOI: 10.1615/IHTC12.2290
6 pages

Аннотация

It is important to investigate a mechanism of boiling phenomena. To clarify the mechanism of nucleate boiling has been a big challenge for researchers. The present work has been carried out to get insight into the mechanism of three-dimensional pool and forced convective subcooled flow boiling by Direct Numerical Simulation (DNS) based on the MARS (Multi-interface Advection and Reconstruction Solver) method developed by Kunugi (1997). The working fluid is water under atmospheric pressure. Boiling and condensation models in this study are based on a homogeneous nucleation and a well-known enthalpy method for phase change of materials, respectively. As for a computational domain regarding a three-dimensional subcooled pool boiling, the bottom wall is heated with a constant heat flux and the spatial and temporal variations of temperature in the solid wall are also considered. The bubble departures with wakes are well demonstrated by the present computation. As for a forced convective subcooled flow boiling in a three-dimensional vertical plane channel, the subcooled water enters the channel and the channel wall is heated from the outside with a constant heat flux. Here, the heat conduction in solid is also considered. The calculated results suggest the existence of high temperature streaks in the downstream of bubble nucleation. The structure and mechanism of these streaks are discussed in terms of the high temperature stagnation region behind bubbles.