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x. simth April 23, 2001 15:12

how to calculate volume fraction of particles from
 
Dear Friends,

I have a question. Now I am using Fluent 5 to simulate particle flow in a pipe. The Discrete Phase Modelling is used to simulate the particle traces. Please tell me how I can get particle volume fraction in the pipe out of Fluent 5. Thanks very much for your help.

Sincerely yours, X Smith

eric April 25, 2001 07:54

Re: how to calculate volume fraction of particles
 
Hi! You can make /display/contour/dpm/dpm-concentration for a local contour If you want a global value, make /report/average/dpm-concentration


Lanre April 26, 2001 15:40

Re: how to calculate volume fraction of particles
 
First, all your particles must exit the computational domain. The DPM model can not be used to give you solids hold-up in a batch process.

Use the Report-->Discrete Phase--> Sample.. (sample planes) to write out a .dpm file. Use Report-->Discrete Phase-->Histogram to read the .dpm file, plot time, get the mean residence time of the particles crossing your outlet boundary.

Volume of particles = mass of DPM flow*residence time/solids density

Volume of fluid zone(s) (from Report-->Volume Integrals)

Solids hold-up = Volume of particles/Volume of fluid zone(s)


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