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收稿日期:
2020-12-03
修回日期:
2021-01-22
出版日期:
2021-02-07
发布日期:
2021-02-07
通讯作者:
许雄文
作者简介:
朱业铭(1996—),男,硕士研究生,基金资助:
ZHU Yeming1(),LIU Jinping1,2,XU Xiongwen1,2(),ZHU Dandan1
Received:
2020-12-03
Revised:
2021-01-22
Online:
2021-02-07
Published:
2021-02-07
Contact:
XU Xiongwen
摘要:
孔结构被广泛应用于传质塔填料中,对填料上的液膜流动和传质行为影响较大。本文对竖直光板和多孔板上的液膜流动进行了三维模拟,并通过实验对验证了模拟的准确性。通过模拟研究了孔结构对液膜流动特性的影响。结果表明,干燥孔会阻碍液膜的铺展,而润湿孔促进液膜的铺展。与光板相比,多孔板上的液膜具有起伏波,这将影响液膜的厚度分布和速度分布。液膜厚度波动和水平方向的速度波动随着孔径的增加而增加,而竖直流动方向的速度随着孔径的增加而降低。当孔径增加到一定值时,毛细波将出现在孔中的液膜中,这大大增加液膜水平方向上的波动速度,而降低流动方向上的速度。当孔径继续增加到临界值时,液膜将破裂。多孔板上孔内和气侧区域存在涡旋,能够促进内部液体交换和增大气侧扰动,从而增强传质能力。
中图分类号:
朱业铭, 刘金平, 许雄文, 朱丹丹. 竖直多孔平板上液膜流动特性的研究[J]. 化工学报, DOI: 10.11949/j.issn.0438-1157.20201737.
ZHU Yeming, LIU Jinping, XU Xiongwen, ZHU Dandan. Research on liquid film flow characteristics of vertical porous plate[J]. CIESC Journal, DOI: 10.11949/j.issn.0438-1157.20201737.
图1 (a) 光滑平板三维模型 (b) 多孔平板三维模型 (c) 多孔板横截面,z=-15?mm
Fig. 1 (a) 3D model of nonporous plate (b) 3D model of porous plate (c) cross profile of porous plate, z=-15?mm
Zone name | Boundary conditions |
---|---|
Inlet | Velocity-inlet (UDF, Nusselt velocity distribution) |
Outlet | Pressure-outlet (0 Pa) |
Top | Symmetry |
Plate | No-slip wall with contact angle |
Side | No-slip wall with contact angle |
Hole | Symmetry |
表1 模型边界条件
Table 1 Model boundary conditions
Zone name | Boundary conditions |
---|---|
Inlet | Velocity-inlet (UDF, Nusselt velocity distribution) |
Outlet | Pressure-outlet (0 Pa) |
Top | Symmetry |
Plate | No-slip wall with contact angle |
Side | No-slip wall with contact angle |
Hole | Symmetry |
(1) | ||
---|---|---|
(2) | ||
(3) | ||
(4) |
表1 给出了模型的边界条件。考虑到计算域的流动长度较短,入口采用Nusselt理论的速度分布,入口液膜厚度和速度分布均跟随Re变化而变化,气液相率分布随入口液膜厚度变化而变化,
(1) | ||
---|---|---|
(2) | ||
(3) | ||
(4) |
光板 | 网格数(万) | 5.2 | 11.8 | 22.5 | 55.7 |
---|---|---|---|---|---|
最小网格体积/ mm3 | 0.1 | 0.022 | 0.016 | 0.0065 | |
最大网格体积/ mm3 | 0.35 | 0.16 | 0.12 | 0.065 | |
多孔板, D=1 mm,S=1 mm,H=0.25 mm | 网格数(万) | 43 | 91 | 143 | 200 |
最小网格体积/ mm3 | 0.0029 | 0.0013 | 0.0004 | 0.0004 | |
最大网格体积/ mm3 | 0.082 | 0.058 | 0.056 | 0.04 |
表2 光板和多孔板模型的网格尺寸
Table 2 mesh size of nonporous and porous plates
光板 | 网格数(万) | 5.2 | 11.8 | 22.5 | 55.7 |
---|---|---|---|---|---|
最小网格体积/ mm3 | 0.1 | 0.022 | 0.016 | 0.0065 | |
最大网格体积/ mm3 | 0.35 | 0.16 | 0.12 | 0.065 | |
多孔板, D=1 mm,S=1 mm,H=0.25 mm | 网格数(万) | 43 | 91 | 143 | 200 |
最小网格体积/ mm3 | 0.0029 | 0.0013 | 0.0004 | 0.0004 | |
最大网格体积/ mm3 | 0.082 | 0.058 | 0.056 | 0.04 |
图5 网格独立性检查,液膜覆盖率 (a) 光板 (b) 多孔板,特定点z=-15?mm,?y=20?mm的液膜厚度 (c) 光板(d) 多孔板,D=1 mm,S=1 mm,H=0.25 mm注:z=-15?mm,?y=20?mm of (c) nonporous plate (d) porous plate, D=1 mm, S=1 mm, H=0.25 mm
Fig. 5 Grid independence, wetted area of (a) nonporous plate (b) porous plate, film thickness at specific point
图6 实验与模拟液膜覆盖率的对比 (a) 光板 (b) 润湿多孔板,D=1 mm,S=1 mm,H=0.25 mm
Fig. 6 Comparison of wetted area between experiment and simulation (a) nonporous plate (b) porous plate, D=1 mm, S=1 mm, H=0.25 mm
图7 (a) 光板与多孔板上液膜覆盖率的比,D=1 mm,S=1 mm,H=0.25 mm (b) Re=40 (c) Re=150 (d) Re=219
Fig. 7 (a) Comparison of wetted area between nonporous and porous plate, D=1 mm, S=1 mm, H=0.25 mm (b) Re=40 (c) Re=150 (d) Re=219
图8 不同孔径下的相界面(VOF=0.5),Re=298, S=1 mm,H=0.25 mm (a) 光板 (b) D=1 mm (c) D=2 mm (d) D=4 mm (e) D=6 mm
Fig. 8 Phase interfaces with different diameters (VOF=0.5), Re=298, S=1 mm, H=0.25 mm (a) nonporous plate (b) D=1 mm (c) D=2 mm (d) D=4 mm (e) D=6 mm
图9 封闭液膜流动方向密度云图,z=-15?mm,Re=298,S=1 mm,H=0.25 mm (a) 光板 (b) D=1 mm (c) D=2 mm (d) D=4 mm (e) 液膜厚度分布
Fig. 9 Density contour of y direction of closed film, z=-15?mm, Re=298, S=1 mm, H=0.25 mm (a) nonporous plate (b) D=1 mm (c) D=2 mm (d) D=4 mm (e) film thickness distribution
图10 不同孔径下的液膜流动形态实验,Re=298,S=1 mm,H=0.25 mm (a) D=4 mm (b) D=6 mm
Fig. 10 Experiments of liquid film flow pattern with different diameter, Re=298, S=1 mm, H=0.25 mm (a) D=4 mm (b) D=6 mm
图11 封闭液膜速度分布,z=-15?mm,Re=298,S=1 mm,H=0.25 mm (a) 沿x方向上的速度 (b) 沿y方向的最大表速度
Fig. 11 Velocity distribution of closed film, z=-15?mm, Re=298, S=1 mm, H=0.25 mm (a) velocity of x direction (b) velocity of y direction
图 12 封闭液膜流线,z=-15?mm,Re=298,S=1 mm,H=0.25 mm (a) 光板 (b) D=1 mm (c) D=2 mm (d) D=4 mm
Fig. 12 Streamline of closed film, z=-15?mm,Re=298, S=1 mm, H=0.25 mm (a) nonporous plate (b) D=1 mm (c) D=2 mm (d) D=4 mm
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