Steam chugging analysis in singlevent vapor injection
Abstract
A complete cycle of the periodic steam chugging phenomenon is analyed. Steam velocity and pressure variations in the vent are described by onedimensional conservation equations. This is coupled either to the water slug model when water is in the vent, or, the infinite pool spherical bubble model at the vent exit during bubble growth. An isolated spherical bubble model is used for computing the collapse pressures. Comparisons of the model predictions with the UCLA 1/12scale and the Japan 1/6scale data indicate that the ventpipe model predicts the ventclearing times and the bubble growth times well. In addition, the predicted maximum chugging heights compared well with those measured in the Japan data. On bubble collapse pressures, the comparison with the spherical bubble model predictions is only fair. The model generally overpredicts the magnitude of the spikes. On examining the effects of pool subcooling and steam mass flux, general agreement is found between the predicted trends and those measured.
 Publication:

Heat Transfer 1982, Volume 4
 Pub Date:
 1982
 Bibcode:
 1982hetr....4....3L
 Keywords:

 Heat Transfer;
 Steam Flow;
 Vents;
 Bubbles;
 Flow Velocity;
 Mathematical Models;
 Pressure Measurement;
 RungeKutta Method;
 Fluid Mechanics and Heat Transfer