CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Drying of particles

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   October 25, 2011, 05:34
Default Drying of particles
Senior Member
Mohsin Mukhtar
Join Date: Mar 2010
Location: South Korea
Posts: 249
Rep Power: 9
Mohsin is on a distinguished road
I am simulating a 3D spray dryer in FLUENT 13 using DPM model (Euler-Lagrangian Approach). Hot N2 enters the dryer in order to dry the solution and to provide swirl motion for proper mixing and heating of the solution (dissolved solution of N-Methyl-2-pyrrolidone (C5H9NO) and Coal). After the initial flow field of N2 is established and simulated, the solution needs to be sprayed into the dryer from the nozzle. The aim of the work is to simulate the drying kinetics of the droplet. Somewhat similar to the drying of milk powder in spray dryers.

After being injected into the dryer, the solution heats up due to the surrounding N2. The liquid N-Methyl-2-pyrrolidone (C5H9NO) evaporates from the solution leaving behind solid coal particles (which will be collected at the bottom of the dryer) whereas the N-Methyl-2-pyrrolidone (C5H9NO)vapors will leave the domain from the dryer’s outlet.

Could you please put some light on the following issues encountered by me on this problem?

1. In “species transport" or "materials" panel, how to define the mixture material (solution of N-Methyl-2-pyrrolidone (C5H9NO) and Coal)? As mentioned earlier, the domain also has N2 which has the largest mass fraction.

2. The problem seems to be complicated (dissolved single phase solution will enter into the domain and it will be converted into solids and vapor during drying). I may need to write a UDF to solve this (for the formation of solids during drying and evaporation of N-Methyl-2-pyrrolidone(C5H9NO) from the dissolved solution). However, to make it simpler, at first; I may consider the coal particles as a suspension not a solution. For suspension, I need to inject 2 phases (solid suspension in liquid) in the domain rather than 1 phase (solution-containing dissolved coal). In this method, the liquid will evaporate from the surface of the solid particle (suspension) leaving behind only the solid particles. For this problem, would FLUENT’s in built evaporation model help me or I'd still need to write a UDF to solve this issue.

Mohsin Mukhtar

Last edited by Mohsin; October 30, 2011 at 09:50.
Mohsin is offline   Reply With Quote


dpm, materials, species transport, spray dryer, udf

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Particles are not hitting the wall CedricVH OpenFOAM Bugs 23 May 19, 2016 20:29
trying to simulate two-phase jet flow with particles in surface injection ajkratos FLUENT 5 March 3, 2015 22:33
Particles do not hit the wall CedricVH OpenFOAM 0 April 15, 2010 08:21
particles model ati_ros61 FLOW-3D 3 December 6, 2009 17:03
how to determine the number of particles injected. welch FLUENT 1 November 1, 2005 06:11

All times are GMT -4. The time now is 02:15.