# How to determine mass flow rate of injections in DPM?

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 January 7, 2015, 05:06 How to determine mass flow rate of injections in DPM? #1 New Member   A. N. Huang Join Date: Jan 2015 Posts: 2 Rep Power: 0 Hello, I want to inject particles into system from file. I don't know how to determine the value of mass flow rate? What is it definition? Thank you very much in advance

 January 9, 2015, 10:11 #2 Senior Member     Daniele Join Date: Oct 2010 Location: Italy Posts: 998 Rep Power: 17 Hi, definition of mass flow?? Mass flow has units of kg/s and it is how much material is entering the system per unit of time. When you use a file for injection(s) you define points of injection(s) (coordinates x,y,z), diameter of particles, injection velocity (vx, vy, vz) temperature of particles and mass flow rate. If you plan to simulate continuous injection(s) you define the mass flow of particles entering the system for each point you define. If you are simulating DEM, then you define a stop injection time very small (

January 16, 2015, 09:34
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A. N. Huang
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 Originally Posted by ghost82 Hi, definition of mass flow?? Mass flow has units of kg/s and it is how much material is entering the system per unit of time. When you use a file for injection(s) you define points of injection(s) (coordinates x,y,z), diameter of particles, injection velocity (vx, vy, vz) temperature of particles and mass flow rate. If you plan to simulate continuous injection(s) you define the mass flow of particles entering the system for each point you define. If you are simulating DEM, then you define a stop injection time very small (
Hello,

I simulate a granular system coupled with DEM.

I use this equation (mass flow (kg/s)*stop time(s)=mass of one particle (kg)) to calculate mass flow rate.

Time step is 1e-5.

The k value of Spring-dashopt is 1000, and the eta value of Spring-dashopt is 0.027.

However, the solution still diverge.

Any advice or parameters that may need changed?

anhuang

 August 14, 2016, 21:17 Non continuous solid injection problem #4 New Member   Join Date: Jan 2015 Posts: 11 Rep Power: 4 Hello, I am simulating transient flow in fludized bed downer. I suppose to have a continuous particles injection through the upper surface(inlet), but what ever I changed with the parcel release method, I got a separate injections of particles even if extend and prolonged the injection stop time. what to do to have a continuous solid flow? Thank you Dawood Last edited by Dawood Al-Mosuli; August 14, 2016 at 23:18.

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