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Clarification of Non-Equilibrium and Equilibrium Flashing Flows

Posted by Hans K. Fauske, D.Sc. on 03.12.19

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).

Safety Valve and Two Phase Flow DIERS

Dr. Fauske provided overall technical direction for the AIChE’s acclaimed DIERS program formed in 1976 as a consortium of 29 companies to develop methods for the design of emergency relief systems to handle runaway reactions. Currently, Dr. Fauske is performing a key role in resolving potential process safety issues and the development of inherently safe nuclear and chemical process reactor concepts.


Topics: process safety, DIERS, two-phase


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