Abstract: The effects of the size of liquid alloyed droplets and the modality of atomizing field on atomizing-combustion process were studied. It was pointed out that the finer the size of the alloyed droplets are, the better the combustion of the alloyis. Violent combustion of fine liquid alloyed droplets results in high temperature and volatilization in burning chamber. It is the combustion of metal gas that the nanosized metal-oxide powders were prepared. On the other hand , vortical nozzle is propitious to contact between liquid alloyed droplets and oxygen for burning completely.
Effects of size of liquid alloyed droplets and modality of atomizing field on oxygenating-combustion
Abstract:
The effects of the size of liquid alloyed droplets and the modality of atomizing field on atomizing combustion process were studied. It was pointed out that the finer the size of the alloyed droplets are, the better the combustion of the alloyis. Violent combustion of fine liquid alloyed droplets results in high temperature and volatilization in burning chamber. It is the combustion of metal gas that the nanosized metal oxide powders were prepared. On the other hand , vortical nozzle is propitious to contact between liquid alloyed droplets and oxygen for burning completely.
Table 1 Effect of size of liquid alloyed droplets on oxygenating-combustion
No.
Atomizing gas
Pressure /MPa
Inside diameter of leaking pipe
Size of grains, d50/μm
Results of atomizing-combustion test by oxygen
1
N2
0.6
4.0
73
Component of powder: mixture of In-Sn alloy and In2O3/SnO2 Color: lark
O2
0.6
4.0
<800 nm
2
N2
1.0
3.2
35
Component of powder: mixture of In-Sn alloy and In2O3/SnO2 Color: kelly
O2
1.0
3.2
<300 nm
3[8]
N2
1.3
1.8
20
Component of powder: In2O3/SnO2 Color: yellow
O2
1.3
1.8
<30 nm
图3 处于雾化流场中的微粒子作圆锥螺旋曲线运动的示意图
Fig.3 Sketch of a particle in atomizing flow field moving along cone curve (a) —Velocity of a particle in the atomizing gas field; (b) —Particle in atomizing flow field moving along a cone curve