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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.
On Tuesday, September 17, FAI will host DIERS meeting attendees at our Burr Ridge, IL campus for lunch and a tour of our state of the art laboratory facilities.
To learn more about the Fall 2019 DIERS Meeting and how to register click below. We look forward to seeing you in September!

Register For Fall 2019 DIERS Meeting and Hotel


Topics: process safety, DIERS, two-phase


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