Sheer Force vs. Viscous Force

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ktrone Participant Join Date: Dec 2008 Posts: 2	Sheer Force vs. Viscous Force 12/01/2008 1:32 AM
	whats the difference between shear force ,viscous force,skin force(wall drag)? If water is flowing in pipe then please tell me how these forces are acting?
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DVader1000 Guru Join Date: May 2007 Location: Anywhere Emperor Palpatine assigns me Posts: 2774 Good Answers: 101	#1 Re: Force 12/01/2008 4:09 AM
	http://cr4.globalspec.com/thread/29987 __________________ If only you knew the power of the Dark Side of the Force
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editorgbanalysts Power-User Join Date: Jul 2008 Location: United States of America Posts: 429 Good Answers: 3	#2 In reply to #1 Re: Force 12/01/2008 7:11 PM
	Not there er.. __________________ EditorGBAnalysts - Give a boy fish and he will eat may be for a day, but teach him how to fish and he will eat everyday.
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DVader1000 Guru Join Date: May 2007 Location: Anywhere Emperor Palpatine assigns me Posts: 2774 Good Answers: 101	#3 In reply to #2 Re: Force 12/01/2008 7:59 PM
	He asked the exact same question there. __________________ If only you knew the power of the Dark Side of the Force
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editorgbanalysts Power-User Join Date: Jul 2008 Location: United States of America Posts: 429 Good Answers: 3	#5 In reply to #3 Re: Force 12/01/2008 11:02 PM
	Now, I get your answer. Thank you. __________________ EditorGBAnalysts - Give a boy fish and he will eat may be for a day, but teach him how to fish and he will eat everyday.
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Physicist? Guru Join Date: Apr 2007 Posts: 3531 Good Answers: 59	#6 Re: Sheer Force vs. Viscous Force 12/02/2008 11:09 AM
	Although they do have specific meanings, you will usually find all of them used as imprecise names for various sheer stresses. Roughly: Viscous force and skin force (wall drag) are forces generated by the medium that cause it to resist an applied sheer. Viscous force is in the bulk of the fluid, whereas skin force represents any differences in the properties of the fluid at its boundaries. When these terms are used and sheer force is used separately, "sheer force" often refers to the sheer that is applied. Note that in many practical situations you need to take into account momentum as well as viscosity - and this can even apply when the flow is laminar. If you don't already have the background to use this to answer your final question, you will need a systematic tutorial; I therefore think your best bet would be a year 12 book on physics (check the index for "pipe flow" before buying).
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phoenix911 Guru Join Date: Aug 2007 Posts: 23647 Good Answers: 420	#7 In reply to #6 Re: Sheer Force vs. Viscous Force 12/03/2008 9:57 AM
	Are we talking shear forces as in rheology? __________________ “ When people get what they want, they are often surprised when they get what they deserve " - James Wood
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Anonymous Poster (1); DVader1000 (2); editorgbanalysts (2); phoenix911 (1); Physicist? (1)

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