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KRNIYER
Participant

Join Date: Nov 2012
Posts: 2

GD2 Value

11/02/2012 1:15 AM

I request someone to enlighten me.

The manufacturers of pump & blower manufacturers give GD2 value in their data sheet.

I referred lot of text books, articles, handbooks, etc,. wherein, there is no specimen calculation available for estimating the GD2 value.

Some information available is that, we need to consider the diameter of impeller.

My queries are:

Is diameter alone sufficient?

Should we not consider the operating parameters viz. - Flow rate, temperature, density & viscosity?

If anyone has got information, please post.

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Pathfinder Tags: GD2 value of centrifugal machinery
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Codemaster
Guru

Join Date: Jul 2005
Location: Stoke-on-Trent, UK
Posts: 4496
Good Answers: 137
#1

Re: GD2 Value

11/02/2012 7:24 AM

It depends on the mass and the way it's distributed. For eg a cylinder of a given mass, small length, large dia gives higher MoI than long and thin.

It's just a mechanical property of the impeller, operating parameters don't come into it.

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nick name
Guru

Join Date: Mar 2007
Location: City of Light
Posts: 3943
Good Answers: 183
#2

Re: GD2 Value

11/02/2012 2:48 PM

GD² is a measure of part INERTIA. If the part is a cylinder and homogen then it is easy to compute the J value. For a complex geometry and variable density ( for instance cooper wire and iron in a motor rotor) it is better to use the GD² value which is directly related to J.
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KRNIYER
Participant

Join Date: Nov 2012
Posts: 2
#3
In reply to #2

Re: GD2 Value

11/03/2012 2:20 AM

Thank you both.

I request a sample calculation, which will help me to understand the theory better.

KRN
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Joshi
Guru

Join Date: Oct 2007
Location: India
Posts: 1246
Good Answers: 34
#4
In reply to #3

Re: GD2 Value

11/03/2012 1:28 PM

Follow these then.
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Users who posted comments:

Codemaster (1); Joshi (1); KRNIYER (1); nick name (1)

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