化工学报 ›› 2023, Vol. 74 ›› Issue (S1): 74-86.DOI: 10.11949/0438-1157.20221605
程成1,2(), 段钟弟1(), 孙浩然3, 胡海涛3, 薛鸿祥1
收稿日期:
2022-12-13
修回日期:
2023-01-09
出版日期:
2023-06-05
发布日期:
2023-09-27
通讯作者:
段钟弟
作者简介:
程成(1994—),男,硕士,助理工程师,chengcheng94@sjtu.edu.cn
基金资助:
Cheng CHENG1,2(), Zhongdi DUAN1(), Haoran SUN3, Haitao HU3, Hongxiang XUE1
Received:
2022-12-13
Revised:
2023-01-09
Online:
2023-06-05
Published:
2023-09-27
Contact:
Zhongdi DUAN
摘要:
析晶污垢是一种普遍存在于换热设备中的有害结晶,损耗设备的换热性能。在换热表面设置粗糙微结构对流动和换热影响显著,也使得表面的析晶污垢沉积机理变得十分复杂。基于析晶沉积动力学理论,建立了有限差分-格子动力学耦合模型,对碳酸钙在微细通道换热表面的沉积特性进行分析,并讨论表面微结构单元的分布间距和高度对结垢行为的影响。结果表明,建立的有限差分-格子动力学耦合模型能够有效模拟微结构背风面的局部涡流和换热表面的结垢过程;微结构分布间距的缩减和高度的增加均会明显使高壁温区域的析晶沉积过程由表面反应主导转变为传质扩散主导;与光滑换热表面的析晶沉积工况对比,微结构的设置及高度增加使换热表面污垢沉积量增多,相邻微结构间的涡也随沉积时间逐渐变小。
中图分类号:
程成, 段钟弟, 孙浩然, 胡海涛, 薛鸿祥. 表面微结构对析晶沉积特性影响的格子Boltzmann模拟[J]. 化工学报, 2023, 74(S1): 74-86.
Cheng CHENG, Zhongdi DUAN, Haoran SUN, Haitao HU, Hongxiang XUE. Lattice Boltzmann simulation of surface microstructure effect on crystallization fouling[J]. CIESC Journal, 2023, 74(S1): 74-86.
参数 | 数值 | 文献 |
---|---|---|
运动黏度υf/(m2/s) | 1×10-6 | — |
扩散系数Ds/(m2/s) | 0.79×10-9 | [ |
析晶常数k0/(m4/(kg·s2)) | 1.65×1022 | [ |
活化能Ea/(kJ/mol) | 179 | [ |
气体常数R/(J/(mol·K)) | 8.314 | — |
流体密度ρl /(kg/m3) | 971 | [ |
碳酸钙密度ρcrystal/(kg/m3) | 2870 | [ |
流体热导率λl /(W/(m·K)) | 0.66 | [ |
碳酸钙热导率λcrystal/(W/(m·K)) | 5.09 | [ |
表1 数值模型的常量设置
Table 1 Constant settings for numerical models
参数 | 数值 | 文献 |
---|---|---|
运动黏度υf/(m2/s) | 1×10-6 | — |
扩散系数Ds/(m2/s) | 0.79×10-9 | [ |
析晶常数k0/(m4/(kg·s2)) | 1.65×1022 | [ |
活化能Ea/(kJ/mol) | 179 | [ |
气体常数R/(J/(mol·K)) | 8.314 | — |
流体密度ρl /(kg/m3) | 971 | [ |
碳酸钙密度ρcrystal/(kg/m3) | 2870 | [ |
流体热导率λl /(W/(m·K)) | 0.66 | [ |
碳酸钙热导率λcrystal/(W/(m·K)) | 5.09 | [ |
入口流速uin/ (m/s) | Vortex length in LBM/mm | Vortex length in Comsol/mm |
---|---|---|
0.01 | 0.4398 | 0.4608 |
0.02 | 0.6854 | 0.6550 |
0.03 | 0.9029 | 0.8468 |
0.04 | 1.1041 | 1.0596 |
0.05 | 1.3053 | 1.2094 |
表2 微结构单元附近旋涡长度对比验证
Table 2 Validation of vortex length near microstructural elements
入口流速uin/ (m/s) | Vortex length in LBM/mm | Vortex length in Comsol/mm |
---|---|---|
0.01 | 0.4398 | 0.4608 |
0.02 | 0.6854 | 0.6550 |
0.03 | 0.9029 | 0.8468 |
0.04 | 1.1041 | 1.0596 |
0.05 | 1.3053 | 1.2094 |
计算工况 | 数量n | 相邻微结构间距d/mm | 微结构横截面高h/mm | 微结构横截面宽w/mm | 首个微结构与入口距离Lin/mm |
---|---|---|---|---|---|
case_d or case_h | 10 | 2 | 0.4 | 0.4 | 6 |
case_+d | 4 | 6 | 0.4 | 0.4 | 6 |
case_-d | 19 | 1 | 0.4 | 0.4 | 6 |
case_-h | 10 | 2 | 0.2 | 0.4 | 6 |
case_+h | 10 | 2 | 0.6 | 0.4 | 6 |
表3 不同间距与高度的微结构设置工况
Table 3 Microstructure cases with different spacing and height
计算工况 | 数量n | 相邻微结构间距d/mm | 微结构横截面高h/mm | 微结构横截面宽w/mm | 首个微结构与入口距离Lin/mm |
---|---|---|---|---|---|
case_d or case_h | 10 | 2 | 0.4 | 0.4 | 6 |
case_+d | 4 | 6 | 0.4 | 0.4 | 6 |
case_-d | 19 | 1 | 0.4 | 0.4 | 6 |
case_-h | 10 | 2 | 0.2 | 0.4 | 6 |
case_+h | 10 | 2 | 0.6 | 0.4 | 6 |
计算工况 | 数量n | 相邻微结构间距d/ mm | 微结构横截面高h/ mm | 微结构横截面宽w/ mm | 首个微结构与入口距离Lin/ mm |
---|---|---|---|---|---|
case_1 | 0 | — | — | — | — |
case_2 | 19 | 1 | 0.4 | 0.1 | 6 |
case_3 | 19 | 1 | 0.6 | 0.1 | 6 |
case_4 | 19 | 1 | 0.8 | 0.1 | 6 |
表4 不同高度微结构设置下的析晶生长工况
Table 4 Crystallization growth cases under different height microstructure settings
计算工况 | 数量n | 相邻微结构间距d/ mm | 微结构横截面高h/ mm | 微结构横截面宽w/ mm | 首个微结构与入口距离Lin/ mm |
---|---|---|---|---|---|
case_1 | 0 | — | — | — | — |
case_2 | 19 | 1 | 0.4 | 0.1 | 6 |
case_3 | 19 | 1 | 0.6 | 0.1 | 6 |
case_4 | 19 | 1 | 0.8 | 0.1 | 6 |
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