Talk:Orifice plate

From Wikipedia, the free encyclopedia

You have new messages (last change).
PLEASE use the above + tab to enter a new comment. That provides you a form in which to first enter a Subject and then enter the new comment. Please sign the comment with four tildes like this ~~~~. That automatically signs it with your user name, the date and the time. The form automatically provides subject Headings like those below and enters them in the Table of Contents which will appear below after four comments are posted.

The first responder to someone's new comment should enter the response just beneath the new comment (instead of using the above + tab) and indent the response by starting with a colon like this :. Any second responder, indent further by starting with two colons like this :: and any third responder, start with three colons like this ::: and so forth. If we don't follow these practices, the result is jumbled mess.


[edit] Something seems wrong

The derivation of the orifice equation doesn't seem right somehow. I'll be back after I've had a chance to research it. Meanwhile, I cleaned up the math equations quite a bit (without changing them) and did some other very minor fixes in the text body of the article. - mbeychok 02:42, 1 May 2006 (UTC)

[edit] Complete re-write and expansion

I have just completed re-writing this article and I believe it now a better article. I still intend to add a section on gas flows through orifices in the next few days. - mbeychok 22:53, 2 May 2006 (UTC)

Looks very good, Mbeychok. I just have one suggestion, to shorten the lead section per WP:LAYOUT#Lead_section. The equations would probably work better in their own section. Coming into the article cold, I'm used to a general lead section with details in later sections. Spalding 03:20, 15 July 2006 (UTC)
Done. Thanks for the suggestion. - mbeychok 04:25, 15 July 2006 (UTC)

[edit] Losses in orifice plate

Thank you for your useful article on the pressure drop across an orifice plate. It would be useful if you could add a section on the losses that occur across the orifice plate. It is frequently necessary to know the losses in a system and in some instances - such as in the outlet to a variable declining rate water filter - an orifice plate is used to increase the losses to prevent excessive flow. 217.15.119.158 13:40, 5 December 2006 (UTC)

Perhaps I don't understand your question, but Equation 2 in the article relates the mass flow to the pressure drop (P1 - P2) across the orifice for a liquid. By a simple re-arrangement of that equation, you could easily solve for the pressure drop, which is the pressure loss across the orifice, is it not? - mbeychok 19:28, 5 December 2006 (UTC)
Thank you for your response. The pressure change in Formula 2 is due to the change in velocity in the orifice arising from the the Bernouilli Equation. If you measure the pressure downstream of the vena contracta the pressure will recover but not to the same value as the upstream pressure because of energy losses in the device. It is these losses that I would like to be able to quantify. 217.15.119.158 11:26, 6 December 2006 (UTC)
I apologise for mis-understanding your question. I don't have one at hand, but any good textbook on fluid dynamics or fluid flow should have that information for you. - mbeychok 16:57, 6 December 2006 (UTC)
Retrieved from "http://en.wikipedia.org../../../o/r/i/Talk%7EOrifice_plate_25a0.html"