Talk:Static pressure

message: Archive 1 has been created with a link at above right. It is an exact copy of the talk page as it was before this edit. Archive 2, when needed in the future, should be a new subpage (same as creating an article) titled "Talk:Static pressure/Archive 2" and the link added to the template on this page's code. For further information on archiving see Wikipedia:How to archive a talk page. See also User:5Q5 for the used archiving procedure. Thank you. Crowsnest (talk) 21:34, 20 May 2008 (UTC)
thread_title: Talk Page Archive

message: This article does not appear to at all address the common use of static pressure in HVAC systems. That seems strange, since I think it probably the most common usage. (E.g. a fan might produce 140 CFM of air blowing into a static pressure of 0 in h20, but only 110 CFM blowing into 0.5 in h20.)
I think that's part of what the first archived comment is about, as well... jhawkinson (talk) 18:04, 14 March 2009 (UTC)
thread_title:  Static pressure in HVAC systems? 

message: This bears reference to the topic "Static Fluid Pressure".
My question to the members is: 
When we say Pitot-tube pressure we mean Dynamic Pressure and when we say Static pressure we are reffering to simple hole drilled on the surface of the conduit (say pipe) opening in to a tube open to atmosphere and long enough to hold the water thrown by STATIC Head!
Now if instead of the Water we assume Steam (560 deg.C, 160 bar(a)) as being the flowing media and the small hole be replaced with a "Tee" followed by a very long topsy turvy Piping closed with a valve at the other end (to visualise, assume simple By-pass connection of Main steam supply pipe)
My question arises here as follows :
1.  Will the fluid, flowing into the branching pipe, have Static Pressure only i.e; to say Elevation Head plus the fluid pressure corresponding to its pressure at that temp?
2. Since the fluid is being stopped at the end of its travel (assuming branch run long enough than the Dynamic head), would the pressure and temp in the branch be termed as Stagnation Temp & Pressure? If so, the stagnation pressure and temp. should come in to picture in the branch line only after the Dynamic head length has passed. This again is perplexing as to how in a particular conduit one can have two pressures!!, though at a distance?
3. Also, if the steam is flowing in the main line (continuously consumed by Turbine), and the bypass line (branch) is closed at the other end. Wouldn't the Fast flowing steam in Main pipe try to SUCK-in the fluid (steam) in branch. (The principle on which Gas stove works viz; Fast flowing Gas sucks the air in through the holes provided in the gas supply tube)??
Kindly shed some light as to how to picturise the phenomenon.
regards, —Preceding unsigned comment added by Pipeyoga011 (talk • contribs) 19:21, 6 September 2010
:When we say Pitot-tube pressure we mean Stagnation pressure.  If changes in elevation are so small they can be ignored, stagnation pressure is equal to static pressure plus dynamic pressure.
:1.  Yes, the fluid flowing into the branching pipe will have static pressure only.  Stagnation pressure only arises from a Pitot-tube (that is, a tube facing forwards into the oncoming flow.)
:2.  No, the fluid in the branch would not be at stagnation temperature or stagnation pressure.  This is because the branch pipe joins the main steam line at a simple opening in the side of the steam line, not at a Pitot-tube.
:3.  No, the fast-flowing steam would not try to suck steam out of the branch line.  That is because the steam in the main line, and in the branch, are both at static pressure.
:You are welcome to ask questions of a scientific nature at the Science Reference Desk.  Talk pages, like this one, are primarily for discussion aimed at improving the article.
:Best regards, Dolphin (t) 00:41, 7 September 2010 (UTC)
thread_title:  Static fluid pressure 

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