化工学报 ›› 2022, Vol. 73 ›› Issue (8): 3541-3552.DOI: 10.11949/0438-1157.20220232
孟辉波1,2(), 蒙彤1,2, 禹言芳1,2(), 王宗勇1,2, 吴剑华1,2
收稿日期:
2022-02-23
修回日期:
2022-04-08
出版日期:
2022-08-05
发布日期:
2022-09-06
通讯作者:
禹言芳
作者简介:
孟辉波(1981—),男,博士,教授,syuct_hj@163.com
基金资助:
Huibo MENG1,2(), Tong MENG1,2, Yanfang YU1,2(), Zongyong WANG1,2, Jianhua WU1,2
Received:
2022-02-23
Revised:
2022-04-08
Online:
2022-08-05
Published:
2022-09-06
Contact:
Yanfang YU
摘要:
在湍流状态Re=2640~17600下,采用恒热通量传热实验与数值模拟相结合的方法,系统研究Reynolds数Re和交错角对Ross LPD型静态混合器内湍流流动与传热性能影响,采用Nusselt数、Darcy摩擦系数、综合传热系数、速度场与温度梯度和压力梯度协同角等参数评价混合器内传热强化性能;基于CFD与LPT相耦合分析混合器内流体微元拉伸率。研究结果表明:SST k-ω模型预测Ross型静态混合器湍流阻力及传热结果与实验结果具有很好一致性;Ross混合器流场内形成与流场尺度较为接近的纵向涡,其涡心在圆形截面与半圆形截面中心间周期性迁移,横截面内湍流分散混合效率是Kenics的3.36~1.72倍;当Re>7040时,Ross LPD综合传热性能明显优于KSM;当叶片夹角为30°时,综合传热性能系数具有最大值;Ross LPD内插件具有高效低阻的技术优势和结构改进潜力。
中图分类号:
孟辉波, 蒙彤, 禹言芳, 王宗勇, 吴剑华. Ross LPD型静态混合器内湍流传热与混合强化特性[J]. 化工学报, 2022, 73(8): 3541-3552.
Huibo MENG, Tong MENG, Yanfang YU, Zongyong WANG, Jianhua WU. Turbulent heat transfer and mixing enhancement characteristics in Ross LPD static mixer[J]. CIESC Journal, 2022, 73(8): 3541-3552.
参数 | 数值 |
---|---|
入口段长度 (l1) | 40 mm |
元件长度 (l2) | 82.91 mm |
相邻元件距离 (l3) | 60 mm |
出口段长度 (l4) | 60 mm |
椭圆板长轴 (a) | 88.11 mm |
椭圆板短轴 (b) | 40 mm |
管径 (D) | 40 mm |
叶片夹角 (α) | 30° |
元件个数 | 12 |
元件厚度 (δ) | 2 mm |
表1 Ross LPD静态混合器的结构参数
Table 1 Specifications of the Ross LPD static mixer
参数 | 数值 |
---|---|
入口段长度 (l1) | 40 mm |
元件长度 (l2) | 82.91 mm |
相邻元件距离 (l3) | 60 mm |
出口段长度 (l4) | 60 mm |
椭圆板长轴 (a) | 88.11 mm |
椭圆板短轴 (b) | 40 mm |
管径 (D) | 40 mm |
叶片夹角 (α) | 30° |
元件个数 | 12 |
元件厚度 (δ) | 2 mm |
Model | Error of f/% | Error of Nu/% |
---|---|---|
SST k-ω | 7.07 | 6.31 |
Standard k-ω | 7.32 | 9.88 |
BSL k-ω | 9.03 | 9.1 |
Realizable k-ε | 14.86 | 191.43 |
Transition k-kl-ω | 7.52 | 25.43 |
Standard k-ε | 14.42 | 225.66 |
RNG k-ε | 13.13 | 310.87 |
Transition SST | 7.11 | 19.68 |
Reynolds stress | 12.06 | 136.95 |
表2 不同模型的模拟结果与实验数据之间的误差
Table 2 Error between predicted results of different models and experimental data
Model | Error of f/% | Error of Nu/% |
---|---|---|
SST k-ω | 7.07 | 6.31 |
Standard k-ω | 7.32 | 9.88 |
BSL k-ω | 9.03 | 9.1 |
Realizable k-ε | 14.86 | 191.43 |
Transition k-kl-ω | 7.52 | 25.43 |
Standard k-ε | 14.42 | 225.66 |
RNG k-ε | 13.13 | 310.87 |
Transition SST | 7.11 | 19.68 |
Reynolds stress | 12.06 | 136.95 |
边界层层数(B) | 网格数量/个 |
---|---|
0 | 1095201 |
5 | 1562317 |
7 | 1746037 |
10 | 1999405 |
13 | 2721679 |
15 | 2813697 |
表3 不同边界层层数网格数量
Table 3 Initialization parameter for grid independence verification
边界层层数(B) | 网格数量/个 |
---|---|
0 | 1095201 |
5 | 1562317 |
7 | 1746037 |
10 | 1999405 |
13 | 2721679 |
15 | 2813697 |
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