1. The onset of flow instability for downward flow in vertical channels
- Author
-
Stelling, R., McAssey, E.V., Jr., Dougherty, T., and Yang, B.W.
- Subjects
Nuclear reactors -- Stability ,Fluids -- Thermal properties ,Fluid mechanics -- Research ,Engineering and manufacturing industries ,Science and technology - Abstract
A pressure drop model simulating the flow regime along a channel from single phase flow through fully developed subcooled boiling is analyzed. It predicts the velocity at which the minimum point in the demand curve, an important reactor safety parameter, occurs. Ledinegg flow instability depends upon the ratio of the heated channel length to the inner tube diameter, the inlet temperature, exit pressure, and surface heat flux. At a given flow rate, the ratio of the surface heat flux to the heat flux required for saturation at the channel exit acts as a good indicator of the minimum point velocity.
- Published
- 1996