3 replies to this topic

[m42364236k]

Dears i have question about chock valve and chock flow

 

as i know when the differential pressure increased in this condition the depending between flow and pressure is constant it means that by changing the downstream pressure flow won be change.

 

imagine  we have control valve with upstream pressure 120 bar and cock valve we want to decrease the pressure to 10 bar ,chock flow happen when the downstream pressure reach to 30 bar .

 

my question

 

does it have any different in valve when pressure from 100 barg reduced to 30 or 20 bar or 10 bar?

 

in this three situation flow rate form chock valve  are same?

 

1-if yes how can we increase or decrease the flow in chock valve?

 

2- in oil and gas wells how we can increased or decreased the capacity(chock valve for each  well 

 

0when we have chock condition?

 

 

thanks

Edited by Art Montemayor, 01 May 2014 - 09:41 AM.
Removed erroneous reference on another thread.

[Art Montemayor]

In the English language, the term "chock" when used as a verb means to wedge or block an object (such as to stop its movement or support it).  As such, your description doesn't make sense.  Perhaps you mean to say CHOKED (as referring to "strangled" or throttled fluid flow).  A lot of forum members often mistakenly use this term, so I don't think it's a typo error.

[m42364236k]

Dear art:

 

Thanks for your reply.

 

You are right.  My question is about choked flow.

[Art Montemayor]

As a response to your basic topic, I submit the attached literature for your reading and study in order to fully understand what sonic or choked flow means and what it involves.  This is a very important topic in fluid mechanics and is a practical tool used by many engineers to control or regulate compressibe fluid flow in industry.  You cannot enter the field of compressible fluids without a thorough understanding of this topic.

 

You will find the answers to your various questions (and perhaps stimulate you and others regarding other questions) in these documents.

 

 AFT-Modeling-Choked-Flow-Through-Orifice (1).pdf   167.32KB   77 downloads

 Gas Choked Flow.doc   101KB   66 downloads

 Mass flow rate of a gas through an orifice during choked conditions.doc   197.5KB   57 downloads