摘要
通过模拟微生物模型在不同表面和流场中的运动学特征,分析了微生物周围的内流特征和防止微生物粘附的内在机理。研究表明:静态流场中,由于微坑内形成旋涡,微结构表面上的流速大于光滑表面,微生物所受变形速率及剪切应力较小,微生物可快速通过微结构表面;动态流场中,近壁区流场呈规律性波动,微生物受到较大变形速率及剪切应力的影响,需更多的动力支持其减缓自身速度以寻找合适的附着点,加大了其附着难度;逆向流场比同向流场具有更好的防污效果。
The kinetic characteristics of microorganism model moving in different surfaces and flow field environments are simulated. The internal flow dynamics and the inherent mechanism of antifouling on microstructure surface are examined. The results indicate that for the static flow field, vortices are generated in the micro-pits as microorganism moves above microstructure surface. The velocity in the microstructure surface is greater than that in the smooth surface, and the strain rate and shear stress exerted on microorganism are relatively smaller resulting in the rapid passing the microstructure surface. For the dynamic flow field, the flow field presents regular fluctuations in the near-wall region. Microorganisms are affected by larger strain rate and shear stress, thus more energy is needed to support microorganisms to slow down its speed to seek suitable attachment points resulting in increasingly difficult attachment. The reverse flow field has a better antifouling effect than the co-directional flow field.
作者
李春曦
薛全喜
张湘珊
叶学民
Li Chunxi;Xue Quanxi;Zhang Xiangshan;Ye Xuemin(Key Lab of Condition Monitoring and Control for Power Plant Equipment of Education Ministry (North China Electric Power University),Baoding 071003,China)
出处
《系统仿真学报》
CAS
CSCD
北大核心
2019年第4期687-695,共9页
Journal of System Simulation
基金
国家自然科学基金(11202079)
河北省自然科学基金(A2015502058)
关键词
微结构
微生物污损
流场
旋涡
microstructure
biofouling
flow field
vortex
