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-   -   how to analyze mechanical energy loss of fluid? (http://www.cfd-online.com/Forums/fluent/34908-how-analyze-mechanical-energy-loss-fluid.html)

Lcw October 24, 2004 05:03

how to analyze mechanical energy loss of fluid?
 
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

par October 26, 2004 19:12

Re: how to analyze mechanical energy loss of fluid
 
Hi,

Do you mean the losses due to the interaction between the fluid and the wall?

Lcw October 26, 2004 21:32

Re: how to analyze mechanical energy loss of fluid
 
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?


par October 27, 2004 11:22

Re: how to analyze mechanical energy loss of fluid
 
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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