By Hans K. Fauske, D.Sc., Emeritus President and Regent Advisor, Fauske & Associates, LLC (FAI)
A simple and easy to apply two-phase flow model that is in excellent agreement with safety valve and nozzle-tube data is illustrated below. The constant flow area length L is the key parameter and values leading to non-equilibrium (short) and equilibrium (long) flashing flows are provided by the flow model. The nozzle inlet condition can be a subcooled liquid, a saturated liquid, or low quality two-phase vapor-liquid mixture, all conditions predicted accurately by the simple flow model.
The details and simple model example calculations will be presented at the AIChE DIERS September 16-18, 2019 meeting in Burr Ridge, Illinois, by Hans K. Fauske, D.Sc. Emeritus President and Regent Advisor, Fauske & Associates, LLC (FAI).