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how to analyze mechanical energy loss of fluid?

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Old   October 24, 2004, 05:03
Default how to analyze mechanical energy loss of fluid?
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Lcw
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As I know, Analysis on mechanical energy loss of fluid(laminar or turbulent flow) has two methods: 1, using experiential formula to compute enengy loss, for example, Darcy formula.This method is often used for engineering problem. 2,using basic energy equation to analyse fluid energy budget. but this method needs numerical computation.This method is often used for theoretical analysis and mechanism research.

Has any other method? or has some review papers on this topic?

thanks

Lcw
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Old   October 26, 2004, 19:12
Default Re: how to analyze mechanical energy loss of fluid
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par
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Hi,

Do you mean the losses due to the interaction between the fluid and the wall?
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Old   October 26, 2004, 21:32
Default Re: how to analyze mechanical energy loss of fluid
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Lcw
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Yes, wall is the main cause resulting in mechanical energy losses. we often consider pipe components as local resistance,by introducing a experiential coefficient to compute its loss. Are there any theoretical approach based on bisic mechanical process to solve it?

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Old   October 27, 2004, 11:22
Default Re: how to analyze mechanical energy loss of fluid
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par
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Hi, in this case you may be talk about viscous losses. As i know it is treated differently depinds on the flow type, ie laminar or turbulent. in laminar flow all you need is to calculate the normal velocity gradient near the wall whereas in turbulent flow you need to consider Reynolds stresses. In fluentI think the viscous is computed using the wall treatment. Hope i gave anything useful Par
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