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#4336005 - 02/21/17 06:37 PM What is this Law called?
MolaKule Offline


Registered: 06/05/02
Posts: 19042
Loc: Iowegia - USA
Name the Law and its Author from the following statement:

"The internal friction of a fluid is constant with respect to the rate of shear."

Fluids that obey this law are called " " fluids.



Let's allow newcomers and non-engineers identify this law.

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#4336020 - 02/21/17 06:48 PM Re: What is this Law called? [Re: MolaKule]
bbhero Offline


Registered: 03/20/15
Posts: 4625
Loc: Virginia
Newtonian.... A shot in the dark... But it just seems like a possible answer.


Edited by bbhero (02/21/17 06:49 PM)
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#4336029 - 02/21/17 06:59 PM Re: What is this Law called? [Re: MolaKule]
joegreen Offline


Registered: 03/10/13
Posts: 760
Loc: NY
Can I google it. lol

Idk ill guess "dynamic"
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#4336053 - 02/21/17 07:19 PM Re: What is this Law called? [Re: bbhero]
RichardS Offline


Registered: 01/14/17
Posts: 616
Loc: Melbourne, Florida
Originally Posted By: bbhero
Newtonian.... A shot in the dark... But it just seems like a possible answer.


seconded.
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#4336058 - 02/21/17 07:20 PM Re: What is this Law called? [Re: MolaKule]
CR94 Offline


Registered: 03/20/16
Posts: 1120
Loc: Western S.C. since 1996
In clearer words, I think, the shear stress is directly proportional to the rate of shear.

That's not true of fluids like blood, paint, melted ice cream, some motor oils, ...
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#4336108 - 02/21/17 08:03 PM Re: What is this Law called? [Re: MolaKule]
Birdman476 Offline


Registered: 04/23/16
Posts: 36
Loc: Arkansas
Stokes Law?

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#4336165 - 02/21/17 09:05 PM Re: What is this Law called? [Re: MolaKule]
Donald Offline


Registered: 03/21/04
Posts: 20456
Loc: Upstate NY
Should I ask my wife, she is a lawyer?

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#4336550 - 02/22/17 10:23 AM Re: What is this Law called? [Re: bbhero]
MolaKule Offline


Registered: 06/05/02
Posts: 19042
Loc: Iowegia - USA
Originally Posted By: bbhero
Newtonian.... A shot in the dark... But it just seems like a possible answer.


OK, you answered the second part of the question.


Now let's answer the first part:

Name the Law and its Author from the following statement:


Edited by MolaKule (02/22/17 10:24 AM)

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#4336585 - 02/22/17 11:06 AM Re: What is this Law called? [Re: MolaKule]
OVERKILL Online   content


Registered: 04/28/08
Posts: 36442
Loc: Ontario, Canada
Isaac Newton, Newton's Law of Viscosity. The fluid is Newtonian as bbhero noted and you have confirmed.
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#4336679 - 02/22/17 01:18 PM Re: What is this Law called? [Re: MolaKule]
bbhero Offline


Registered: 03/20/15
Posts: 4625
Loc: Virginia
Well of course I knew it was Sir Isaac Newton smile I just wanted to answer the Law part of the question. The Law of viscosity I would have likely figured out.
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#4337204 - 02/22/17 10:59 PM Re: What is this Law called? [Re: MolaKule]
MolaKule Offline


Registered: 06/05/02
Posts: 19042
Loc: Iowegia - USA
Good answers.

However, I asked all engineers from refraining to answer the questions.

Newtons Law of Viscosity only describes fluids that are considered "Newtonian," or fluids that are described in his law.

Common fluids such as gasses, water, Olive Oil, and mineral base oils are Newtonian.

Many other fluids are non-Newtonian and their viscosity depends on the rate of shear to which they are subjected. Greases, inks, and paints are considered non-Newtonian.

Some non-Newtonian fluids can change their viscosity with a change in both temperature and shear, and one of those is Viscosity Index Improvers (VII). However, shear-resistant VII's are the norm today. Shear resistant VII's means that even though some VII molecules may be sheared by mechanical forces, they can reform quickly.

Newton's Law of Viscosity is a Constitutive Equation and not a fundamental law of nature. In physics and engineering, a constitutive equation or constitutive relation is a relation between two physical quantities (especially kinetic quantities as related to kinematic quantities) that is specific to a material or substance, and approximates the response of that material to external stimuli, usually as applied forces. I.E., it is not a fundamental law of nature but an approximation that holds in some materials and fails in others.

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#4535775 - 10/06/17 09:16 PM Re: What is this Law called? [Re: MolaKule]
benjy Offline


Registered: 08/23/10
Posts: 865
Loc: pa
you mean to say what i have been reading almost forever that VII's get permanently sheared to a point can "reattach" to themselves + become whole again!!

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