全文HTML
1 物理模型
Fig. 1 Vapor heterogeneous agglomeration device

2 数学模型
2.1 颗粒群平衡模型
(1) |
2.2 凝结增长速率函数
2.2.1 模型假设
2.2.2 凝结增长动力学方程
(2) |
(3) |
(4) |
2.2.3 相间换热
(5) |
(6) |
2.3 碰撞团聚核函数
(8) |
3 边界条件
Table 1 Volume fraction of differently sized particles
粒径区间 | 平均粒径/μm | 颗粒体积分数fi |
Bin-1 | 10.159 37 | 0.396 9 |
Bin-2 | 6.400 000 | 0.251 8 |
Bin-3 | 4.031 748 | 0.204 4 |
Bin-4 | 2.539 842 | 0.122 3 |
Bin-5 | 1.600 000 | 0.020 1 |
Bin-6 | 1.007 937 | 0.003 6 |
Bin-7 | 0.634 961 | 0.000 8 |
Bin-8 | 0.400 000 | 0.000 1 |
4 模型计算与分析
Fig. 2 Change of outlet concentration percentage of differently sized particles at different step of iteration
Fig. 2 Change of outlet concentration percentage of differently sized particles at different step of iteration

4.1 来流速度对相变凝结的敏感性分析
Fig. 3 Change of concentration percentage of differently sized particles at different flow velocities
Fig. 3 Change of concentration percentage of differently sized particles at different flow velocities

4.2 来流速度一定时相关因素对相变凝结的影响
4.2.1 初始蒸汽饱和度对相变凝结的影响
Fig. 4 Change of concentration percentage of differently sized particles at different initial vapor saturation
Fig. 4 Change of concentration percentage of differently sized particles at different initial vapor saturation

4.2.2 停留时间对相变凝结的影响
Fig. 5 Change of concentration percentage of differently sized particles at different residence time
Fig. 5 Change of concentration percentage of differently sized particles at different residence time

4.2.3 初始颗粒数浓度对相变凝结的影响
Fig. 6 Change of concentration percentage of differently sized particles at different initial number concentration
Fig. 6 Change of concentration percentage of differently sized particles at different initial number concentration

4.2.4 初始粒径对相变凝结的影响
Table 2 Initial particle size distribution of coarse and fine particles
平均粒径/μm | 细颗粒体积分数fi | 粗颗粒体积分数fi |
25.398 42 | 0.396 9 | |
16.000 00 | 0.251 8 | |
10.159 37 | 0.396 9 | 0.204 4 |
6.400 000 | 0.251 8 | 0.122 3 |
4.031 748 | 0.204 4 | 0.020 1 |
2.539 842 | 0.122 3 | 0.003 6 |
1.600 000 | 0.020 1 | 0.000 8 |
1.007 937 | 0.003 6 | 0.000 1 |
0.634 961 | 0.000 8 | |
0.400 000 | 0.000 1 |
Fig. 7 Change of concentration percentage of differently sized particles at different initial particle size
Fig. 7 Change of concentration percentage of differently sized particles at different initial particle size

4.2.5 碰撞团聚对相变凝结的影响
Fig. 8 Change of concentration percentage of differently sized particles of neglecting,considering collision agglomeration
Fig. 8 Change of concentration percentage of differently sized particles of neglecting,considering collision agglomeration
