hi all, in my simulation, there are two kind reaction particles. how to identify two kind particles injetted from 2 inlet in UDF?

particle A

\ \ ---------- ----------------------------- -----> -----> ---------- -----------------------------

/ /

particle B

You do not need UDF.

SIncerely, Jinwook

Jinwook, thank u for reply. for example, in one furnace with 3 inlet, for air,pulverized coal and CaCO3 particles. To simulation CaCO3(s)-->CaO(s)+O2 in coal combustion. would do you give me some hits to identify these two kind partice in DPM model? BR

Fluent can model multiple reaction of partilce or droplet.

Partilce(solid) is decomposed to two material, VM(Volatile Matter, gas) and Solid(s). Solid(s) contains two material, CF(Combustible Fraction, solid) and Inert(s).

The reaction mechanism of particle is as following.

Particle(s) --> Solid(s) + VM(g),

Solid(s)[CF(s) + Inert(s)] + C(g) --> Inert(s) + D(g).

So, you can model CaCO3(s)-->CaO(s)+CO2 by setting,

CO2 as VM, and CaO as CF(s) or Inert.

So, it's fairly easy. But..... Is it your final goal ? I guess that you want to include more reaction such as ......

Sincerely, Jinwook

ok, as you said, how to set two kind "coal"? my goal is that: coal combustion and, CaCO3 decomposed. +++++++++++++++++++++++++++ my ideal is that using dpm model simulate caco3 particles reaction. In UDF particle pointer 1~n for tracking coal particle, and particle pointer n+1~N for CaCO3 particle. but I don't know how to set these tracking particle.

Sorry, but, what I can say is, please study 'DEFINE-->INJECTION'.

Sincerely, Jinwook