Simviation Forum - De-Ice questions

Reply #15 - Aug 20^th, 2004 at 7:48am

Nexus Offline
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Yeah and air is a FLUID, what is your point?
It is still not filled with a liquid substance that freezes Wink

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Reply #16 - Aug 20^th, 2004 at 8:19am

BiggBaddWolf Ex Member

Well from what I remember from science class air is a GAS.... Roll Eyes

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Reply #17 - Aug 20^th, 2004 at 8:42am

Nexus Offline
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Sigh...Air might be a gas, but it SHARES the same charasteristics as a fluid, hence it is technically refered to as a fluid.

Copied from an online dictionary:
"Fluid= (technical) that can flow freely, as gases and liquids do: a fluid consistency "

http://www.oup.com/elt/oald/

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Reply #18 - Aug 20^th, 2004 at 9:05am

Chris_F Offline
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Quote:

Well from what I remember from science class air is a GAS.... Roll Eyes

Fluid is a generic term for a material which will flow, i.e. anything except a solid. Gases, liquids, and plasmas are all fluids.

See the following for a description of how a pitot tube works:

http://travel.howstuffworks.com/question597.htm

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Reply #19 - Aug 20^th, 2004 at 9:06am

BiggBaddWolf Ex Member

Well I think if I were inhaling fluids into my lungs, and not air which is a gas, I would drown very shortly Shocked

Also had you checked your dictionary a little closer you would have found the correct spelling is "referred" Undecided

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Reply #20 - Aug 20^th, 2004 at 9:13am

Nexus Offline
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english is not my 1st language, and to pick on spelling mistakes is not the issue here

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Reply #21 - Aug 20^th, 2004 at 9:44am

BiggBaddWolf Ex Member

You are so right .......sorry Lips Sealed

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Reply #22 - Aug 20^th, 2004 at 9:45am

Billerator Offline
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A pitot tube is still just a tube with no liquid in it, honestly.

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Reply #23 - Aug 20^th, 2004 at 10:41am

Chris_F Offline
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Look up "fluid" at dictionary.com

"A continuous, amorphous substance whose molecules move freely past one another and that has the tendency to assume the shape of its container; a liquid or gas"

In engineer-speak (the physicists in the room will disagree) a gas is a compressable fluid, a liquid is a non-compressable fluid. You've had fluid in your lungs since the day you were born (as have I). If you ever encounter a circumstance where there are no fluids in your lung (for example, if you're sucked in to the vacuum of space) you will be a very unhappy person.

It seems to me like you looked up the definition of pitot tube, saw that it was a device for measuring fluid flow velocity and was filled with fluid, and assumed the definition of "fluid" was "liquid". It's a simple mistake. I don't understand why you're willing to look up and trust the definition of pitot tube but aren't willing to look up or trust the definition of "fluid".

Please see my link to "how stuff works" which describes the function of the pitot tube. If you need further knowledge on the subject I'd be happy to provide insight in to the device as I have a pretty intimate knowledge of their function.

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Reply #24 - Aug 20^th, 2004 at 10:43am

Chris_F Offline
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Quote:

A pitot tube is still just a tube with no liquid in it, honestly.

Not all the time. When you use a pitot tube to measure the flow velocity of water the tube will indeed have liquid in it. The device, as found in an airplace and properly functioning, will have no liquid in it. Just like to pick nits sometimes... Tongue

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Reply #25 - Aug 20^th, 2004 at 11:02am

codered Offline
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Well I think Iggy knows more about Pitot Tubes, air being a liquid and a gas, having in your lungs, than they bargined for. Grin

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Reply #26 - Aug 20^th, 2004 at 12:04pm

JBaymore Offline
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Amen to that Wink

.

best,

..................john

Intel i7 960 quad 3.2G LGA 1366, Asus P6X58D Premium, 750W Corsair, 6 gig 1600 DDR3, Spinpoint 1TB 7200 HD, Caviar 500G 7200 HD, GTX275 1280M, Logitec Z640, Win7 Pro 64b, CH Products yoke, pedals + throttle quad, simpit

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Reply #27 - Aug 20^th, 2004 at 4:38pm

elkinallen Offline
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Wow!! This was fun reading this!!!

My 2 cents: Fluid dynamics is what allows an aircraft to fly. It causes icing above freezing temps too!

The pitot ices due to Bernoullies: 'As the velocity of a fluid increases, it's pressure decreases'. For the purpose of Aviation, Air is a fluid. When air's pressure is decreased, so is it's temperature.

The pito will collect condensation, rain, etc. It will then freeze in the right conditions.

Why will it freeze and other things won't? Because it is a small sharp object that allows the air to QUICKLY zoom around it. Zooming air has less of a pressure #.
This is why wingtip, prop tip etc show 'vortices' before other surfaces.

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Reply #28 - Aug 22^nd, 2004 at 2:47am

codered Offline
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I just did a flight in major icing conditions and I did not turn on the pitot heat nor the carb heat. My aircraft iced up pretty well, and it took all it could to get it to the airport. FS9 does simulate icing after. Just a little test. Grin

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Reply #29 - Aug 22^nd, 2004 at 4:04am

Politically Incorrect Offline
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Well it can be looked at like this. If air was 100% oxygen(which it isn't, about 78% nitrogen and 21%) then it would be a gas, but you add hydrogen it turns into water so in sense when you have high moisture in your little pitot tube it is then filled with a liquid, which in certain temperatures will freeze then cause instrument failure and impending doom Grin

This reminds me of the argument: Mercury the only liquid that isn't a liquid............
Denpending on who you ask some will say it is a metal, some a liquid. Wink

So in all in all no-one here is really wrong

Now Which came first the chicken or the egg??

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