文档介绍：Heat and Mass Transfer 40 (2004) 355–364
DOI -003-0423-2
Numerical investigation of static flow instability
in a low-pressure subcooled boiling channel
Y. Li, . Yeoh, . Tu
355
Abstract A three-dimensional two-fluid model to predict system environment is susceptible to the onset of a
subcooled boiling flow at low pressure is presented. The number of instabilities. They can be classified as density
model is adopted to investigate the two-phase flow and wave oscillations, flow excursion, flooding and flow
heat transfer characteristics in a heated channel. The reversal, during the pump coast-down or loss of coolant
presence of bubbles as a consequence of heating flow flow accidents (LOCA). These instabilities affect the nu-
through a vertical rectangular channel has a significant clear reactor adversely, increasing the possibility of pre-
effect on the overall pressure drop along the channel. mature burnout of the fuel elements, which will worsen the
Numerical results pared against a series experi- accident scenario. It is rather essential then to develop a
mental data performed at various conditions – mass flux, methodology to predict these instabilities and to know the
heat flux, inlet temperature and exit pressure. Good stability margins of these reactors.
agreement on the overall pressure drop was achieved. The For a low flow, low pressure (typical of