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DarkMatter
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 Posted: Tue May 06, 2008 7:37 pm Post subject: Fluids |
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| Are all liquids and gases fluids? |
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dlzc
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| Posted: Tue May 06, 2008 9:21 pm Post subject: Re: Fluids |
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Dear DarkMatter:
On May 6, 12:37 pm, DarkMatter <darkmatte...@yahoo.com> wrote:
[quote]Are all liquids and gases fluids?
[/quote]
Yes. Fluid mechanics studies the behavior of liquids and gases, where
chemical changes are not involved.
In some cases, powdered solids also act like fluids (might require
vibration to get the fluid behavior).
Fluid means "takes the shape of its container", if you need a general
description.
David A. Smith |
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Jan Gerrit Kootstra
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| Posted: Wed May 07, 2008 12:44 am Post subject: Re: Fluids |
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DarkMatter wrote:
[quote]Are all liquids and gases fluids?
Too CFD engineers they are.[/quote] |
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Guest
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| Posted: Wed May 07, 2008 2:55 am Post subject: Re: Fluids |
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On Tue, 6 May 2008 12:37:35 -0700 (PDT), in sci.mech.fluids DarkMatter
<darkmatter34@yahoo.com> wrote:
[quote]Are all liquids and gases fluids?
[/quote]
http://chemistry.about.com/od/chemistryglossary/a/fluiddef.htm
Definition: a fluid is any substance that flows or deforms under an applied
shear stress. Fluids comprise a subset of the states of matter and include
liquids, gases, and plasma. |
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N:dlzc D:aol T:com (dlzc)
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| Posted: Wed May 07, 2008 6:15 am Post subject: Re: Fluids |
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Dear me@mine.net:
<me@mine.net> wrote in message
news:mtk124h86pucnkbl9rt4q9v1sf2h63i1ma@4ax.com...
[quote]On Tue, 6 May 2008 12:37:35 -0700 (PDT), in sci.mech.fluids
DarkMatter
darkmatter34@yahoo.com> wrote:
Are all liquids and gases fluids?
http://chemistry.about.com/od/chemistryglossary/a/fluiddef.htm
Definition: a fluid is any substance that flows or
deforms under an applied shear stress.
[/quote]
That is a lousy definition, since it includes solids too... even
crystal. All real materials "deform under an applied shear
stress".
David A. Smith |
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crh
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| Posted: Wed May 07, 2008 7:17 am Post subject: Re: Fluids |
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On May 6, 2:55 pm, m...@mine.net wrote:
[quote]On Tue, 6 May 2008 12:37:35 -0700 (PDT), in sci.mech.fluids DarkMatter
darkmatte...@yahoo.com> wrote:
Are all liquids and gases fluids?
http://chemistry.about.com/od/chemistryglossary/a/fluiddef.htm
Definition: a fluid is any substance that flows or deforms under an applied
shear stress. Fluids comprise a subset of the states of matter and include
liquids, gases, and plasma.
[/quote]
Is this not actually "deform linearly under an applied shear stress?"
This is generally given as the epitomical "ideal fluid." I believe the
key differentiating factor is that fluids deform linearly under shear,
whereas solids will deform with a linear pattern in the "elastic"
regime but in the plastic regime will experience nonlinearities.
Chris Heckman |
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dlzc
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| Posted: Wed May 07, 2008 5:08 pm Post subject: Re: Fluids |
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Dear me@mine.net:
On May 7, 9:24 am, m...@mine.net wrote:
[quote]On Wed, 7 May 2008 00:17:29 -0700 (PDT), in sci.mech.fluids crh
...
Is this not actually "deform linearly under an
applied shear stress?" This is generally given
as the epitomical "ideal fluid." I believe the
key differentiating factor is that fluids
deform linearly under shear, whereas solids
will deform with a linear pattern in the
"elastic" regime but in the plastic regime will
experience nonlinearities.
Actually the qualifier that needs to be added
continually.
From Intro to Fluid Mechanics by Fox and McDonald:
A fluid is a substance that deforms continuously
under the application of a shearing stress no
matter how small the shearing stress.
[/quote]
A single word will not be enough. The crust upon which we stand...
far enough down, deforms continuously for a continuous *non-small*
shear stress.
I think word games, and nuance, might be the wrong approach. How
about:
A fluid is any state of matter that is not a solid.
;>)
David A. Smith |
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Guest
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| Posted: Wed May 07, 2008 9:24 pm Post subject: Re: Fluids |
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On Wed, 7 May 2008 00:17:29 -0700 (PDT), in sci.mech.fluids crh
<crheckman@gmail.com> wrote:
[quote]On May 6, 2:55 pm, m...@mine.net wrote:
On Tue, 6 May 2008 12:37:35 -0700 (PDT), in sci.mech.fluids DarkMatter
darkmatte...@yahoo.com> wrote:
Are all liquids and gases fluids?
http://chemistry.about.com/od/chemistryglossary/a/fluiddef.htm
Definition: a fluid is any substance that flows or deforms under an applied
shear stress. Fluids comprise a subset of the states of matter and include
liquids, gases, and plasma.
Is this not actually "deform linearly under an applied shear stress?"
This is generally given as the epitomical "ideal fluid." I believe the
key differentiating factor is that fluids deform linearly under shear,
whereas solids will deform with a linear pattern in the "elastic"
regime but in the plastic regime will experience nonlinearities.
[/quote]
Actually the qualifier that needs to be added continually.
From Intro to Fluid Mechanics by Fox and McDonald:
A fluid is a substance that deforms continuously under the
application of a shearing stress no matter how small the shearing
stress. |
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DarkMatter
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| Posted: Thu May 08, 2008 1:45 am Post subject: Re: Fluids |
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On May 7, 6:51 pm, "Daniel Mandic" <daniel_man...@aon.at> wrote:
[quote]Gaseous - fluid - solid
Steam - Water - Ice
Best regards,
Daniel Mandic
[/quote]
So steam and water are both fluids? |
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Daniel Mandic
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| Posted: Thu May 08, 2008 4:51 am Post subject: Re: Fluids |
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DarkMatter wrote:
[quote]Are all liquids and gases fluids?
[/quote]
Hi!
Gaseous - fluid - solid
Steam - Water - Ice
Best regards,
Daniel Mandic |
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616
Guest
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| Posted: Thu May 08, 2008 1:58 pm Post subject: Re: Fluids |
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DarkMatter wrote:
[quote]On May 7, 6:51 pm, "Daniel Mandic" <daniel_man...@aon.at> wrote:
Gaseous - fluid - solid
Steam - Water - Ice
Best regards,
Daniel Mandic
So steam and water are both fluids?
[/quote]
yes!
=)
/BG |
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