Effects of Moving Pattern on Dipping Thickness Distributions in Polymer Heart Valve
10.16156/j.1004-7220.2025.04.029
- VernacularTitle:运动模式对高分子心脏瓣膜浸渍厚度分布影响
- Author:
Haiyang WEI
1
;
Zheng LI
;
Qianwen HOU
;
Yana MENG
;
Liangwei ZHU
;
Enhui HAN
;
Jianjun HU
;
Jianye ZHOU
Author Information
1. 北京协和医学院/中国医学科学院/阜外医院/国家心血管病中心,北京 100037
- Publication Type:Journal Article
- Keywords:
volume of fluid(VOF)model;
Eulerian wall-film(EWF)model;
numerical simulation;
dip-coating;
moving patterns;
polymer heart valve
- From:
Journal of Medical Biomechanics
2025;40(4):1012-1019
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the impact of different moving patterns during the dip-coating process on thickness distributions of polymer heart valves.Methods Based on the volume of fluid(VOF)multiphase flow model,the Eulerian wall-film(EWF)model,and dynamic mesh technology,the dip-coating manufacturing process of polymer heart valves were numerically simulated.The effects of vertical,horizontal,and circular moving patterns on flow characteristics of the surface impregnation liquid and liquid film distributions under self-rotation conditions of the models were mainly studied.Subsequently,seven identical test points were set on each valve leaflet to collect thickness data,and the coefficient of variation(CV)was calculated to evaluate the uniformity of the liquid film thickness.Given that the vertical and horizontal patterns had fewer moving planes,limiting the optimization space,the circular pattern(45°)with richer moving planes was selected as the basis for optimization,and comparative analysis of numerical simulation was conducted.Results In the vertical pattern,the peak CV was 0.461 3;in the horizontal pattern,the CV was 0.060 8;and in the circular pattern,the CV at 30°,45° and 60° were 0.457 5,0.272 8,and 0.255 6,respectively.After optimization,the CV for the circular pattern(45°)decreased to 0.052 5,representing an 80.7％reduction compared to the pre-optimization value.Conclusions The moving patterns significantly affect the uniformity of dip-coating thickness distributions.The horizontal pattern demonstrates the best uniformity,while the vertical pattern shows the poorest uniformity.The CV for the circular pattern decreases as the angle increases,with its uniformity between that of the vertical and horizontal patterns.Optimization of moving pattern parameters based on simulation results has improved the uniformity of thickness distributions.
