Problems involved heat transfer inside a particle and its thermal degradation

zhangr · August 20, 2011, 23:52

Hello, guys!

Firstly, a brief description of my simulaiton: I want to inject a coal particle at the top of a reactor which is assumed to be a vertical tube, and with the influence of the gravity force, the particle will fall down. Before such, I would introduce the nitrogen gas at the bottom of the tube, which would be at the temperature of 600℃. So during the process of falling down of the particle, it will be heated by the gas, and at the same time, the degradation of the particle will occur. Particle track is tackled by Lagrangian approach, while the gas is dealed with by Eular one. My questions are below:
1. How to simulate the temperature distribution along the radius of the particle by the STAR ? Just as you know, the gas introduced from the bottom will heat the particle, but as a matter of fact, as an item whose volume could not be neglected, along the radius of the particle, there should be a temperature gradient.
2.How to simulate chemical reaction of the particle ? The reaction I want to simulate is such: Coal→Char + Volatile. This reaction will be one-order for all the species involved. Arrhenius equation will be used, and all the parameters to use are clear.
Is there anybody can give me some suggestions or instruction?

zhangr · August 20, 2011, 23:57

Before I forget, the version of software I used for my simulation is STAR CCM+6.02.

zhangr · August 25, 2011, 07:59

nobody has similar experience？？

August 20, 2011, 23:52	Problems involved heat transfer inside a particle and its thermal degradation	#1
zhangr New Member zhangrong Join Date: Aug 2011 Posts: 4 Rep Power: 15	Hello, guys! Firstly, a brief description of my simulaiton: I want to inject a coal particle at the top of a reactor which is assumed to be a vertical tube, and with the influence of the gravity force, the particle will fall down. Before such, I would introduce the nitrogen gas at the bottom of the tube, which would be at the temperature of 600℃. So during the process of falling down of the particle, it will be heated by the gas, and at the same time, the degradation of the particle will occur. Particle track is tackled by Lagrangian approach, while the gas is dealed with by Eular one. My questions are below: 1. How to simulate the temperature distribution along the radius of the particle by the STAR ? Just as you know, the gas introduced from the bottom will heat the particle, but as a matter of fact, as an item whose volume could not be neglected, along the radius of the particle, there should be a temperature gradient. 2.How to simulate chemical reaction of the particle ? The reaction I want to simulate is such: Coal→Char + Volatile. This reaction will be one-order for all the species involved. Arrhenius equation will be used, and all the parameters to use are clear. Is there anybody can give me some suggestions or instruction?

August 20, 2011, 23:57		#2
zhangr New Member zhangrong Join Date: Aug 2011 Posts: 4 Rep Power: 15	Before I forget, the version of software I used for my simulation is STAR CCM+6.02.

August 25, 2011, 07:59		#3
zhangr New Member zhangrong Join Date: Aug 2011 Posts: 4 Rep Power: 15	nobody has similar experience？？