微生物污垢的生长模型与受力分析

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清华大学辅仁网/2017-07-07

微生物污垢的生长模型与受力分析

杨倩鹏¹,陈晓东²,田磊¹,史琳¹(

)

2. 厦门大学化学化工学院, 化学工程与生物工程系, 厦门 361005

Biofouling growth model and force analysis

Qianpeng YANG¹,Xiaodong CHEN²,Lei TIAN¹,Lin SHI¹(

)

1. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China
2. Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China

摘要:

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文章导读

摘要换热设备表面形成的微生物污垢严重影响了换热效率和系统安全。为了减少微生物污垢,需要研究微生物污垢的生长机理和受力特性。该文采用3维细胞自动机模型,对微生物污垢进行了生长模拟,并模拟了混合菌种的相互抑制。针对微生物污垢形状多样的特点,提出了形状因子的概念,分析了形状因子与受力的关系。该文细胞自动机模型采用了换热设备的代表性菌种——枯草芽孢杆菌和鳗鱼气单胞菌。采用该模型模拟两种菌种的生长机理和相互抑制,结果发现换热设备抑垢应侧重于枯草芽孢杆菌。该文提出的形状因子能较好量化污垢形状,有效地描述了3种典型污垢形状。形状因子简化了污垢形状与受力的关联分析,有助于不同形状污垢的对比。

关键词 ：能源管理与节能,微生物污垢,细胞自动机模型,形状因子

Abstract：Biofouling on heat exchanger surfaces reduces the heat transfer rate and the system security. Thus, more investigations are needed on biofouling growth mechanisms and the forces acting on the biofouling. This study uses a three dimensional cellular automata model to simulate biofouling growth. Reciprocal inhibition between different bacteria strains is also simulated. A shape factor concept is then used to describe the various biofouling shapes to analyze the forces on the biofouling. The cellular automata model simulates Bacillus subtilis and Aeromonas ichthiosmia as typical heat exchanger bacteria strains. The model simulates the biofouling growth and reciprocal inhibition to show that the heat exchanger biofouling inhibition should focus on Bacillus subtilis. The shape factors for three typical shapes used in this work accurately model the biofouling shapes. The shape factors simplify the force analyses and are useful for comparing different biofouling shapes.

Key words：energy management and saving biofouling cellular automata model shape factor

收稿日期: 2012-04-26 出版日期: 2015-04-16

ZTFLH:

基金资助:国家自然科学基金面上项目(50976060);国家 “九七三” 重点基础研究项目 (2010CB227305)

引用本文:

杨倩鹏, 陈晓东, 田磊, 史琳. 微生物污垢的生长模型与受力分析[J]. 清华大学学报（自然科学版）, 2014, 54(2): 247-252.
Qianpeng YANG, Xiaodong CHEN, Lei TIAN, Lin SHI. Biofouling growth model and force analysis. Journal of Tsinghua University(Science and Technology), 2014, 54(2): 247-252.

链接本文:

http://jst.tsinghuajournals.com/CN/或 http://jst.tsinghuajournals.com/CN/Y2014/V54/I2/247

图表:

模型参数	设定值
枯草芽孢杆菌数量	2.5´10⁴个/mL
枯草芽孢杆菌基质系数	0.34
枯草芽孢杆菌SMP系数	0.45 ^[7]
枯草芽孢杆菌EPS系数	0.18 ^[14]
枯草芽孢杆菌粘附概率	0.10
鳗鱼气单胞菌数量	2.5´10⁴个/mL
鳗鱼气单胞菌基质系数	0.24
鳗鱼气单胞菌SMP系数	0.40 ^[7]
鳗鱼气单胞菌EPS系数	0.20 ^[14]
鳗鱼气单胞菌粘附概率	0.05

混合菌种模型参数

枯草芽孢杆菌和鳗鱼气单胞菌模拟结果

微生物污垢形状参数

微生物污垢典型形状因子

模型参数	设定值	来源
流速	1 m/s	换热器流速
污垢密度	900 kg/m³	实验测量
污垢导热系数	0.55 W/(m²·K)	实验测量
污垢弹性模量	200 kPa	文[18]
污垢Poisson比	0.48	文[18]
污垢屈服强度	10 kPa	文[18]
污垢拉断强度	12 kPa	文[18]
模拟尺度	500 μm	—
最小网格尺度	1 μm	—
边界条件	恒壁温	—

多物理场模拟参数

污垢周围多物理场分布

污垢形状描述方法及其与压力、剪切力和应力极值的关联

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