Faculty of Engineering Sciences, Unit of Environmental Engineering, Ben-Gurion University of the Negev, Beer-Sheva, Israel.
Biofouling. 2013 Sep;29(8):977-89. doi: 10.1080/08927014.2013.823483. Epub 2013 Aug 15.
The parallel-plate flow chamber (PFC) is often used for characterizing the propensity of microorganisms to attachment to surfaces. The model presented quantitatively analyzes the complex interplay of diffusion, convection, inertial lift, buoyancy, and surface forces in the PFC, which make it difficult to separate the surface- and microorganism-specific effects from the hydrodynamics. An empirical dimensionless factor K entering the boundary condition expresses enhancement of adhesion diffusion of microorganisms across a thin fluid layer adjacent to the surface by adhesion forces. The model examines the role of various factors (e.g., shear rate, size of bacterium, and strength of adhesion) on the rate of bacterial deposition. Using no adjustable parameter for strongly adhesive surfaces and K as the only adjustable parameter for repulsive or weakly adhesive surfaces, the model explains the observed decrease in deposition flux at high flow rates and compares reasonably with reported experimental results. The results suggest that the fitted value of K may be used for 'rating' the propensity of bacteria to deposit on surfaces and separating this from hydrodynamic effects.
平行板流室（PFC）常用于描述微生物附着表面的倾向。所提出的模型定量分析了扩散、对流、惯性升力、浮力和表面力在 PFC 中的复杂相互作用，这使得难以将表面和微生物特有的效应与流体动力学分开。进入边界条件的无量纲因子 K 表示由粘附力增强微生物在靠近表面的薄流体层中的粘附扩散。该模型研究了各种因素（例如剪切速率、细菌大小和粘附强度）对细菌沉积速率的作用。对于强粘附表面，不使用可调参数，而对于排斥或弱粘附表面，将 K 作为唯一可调参数，该模型解释了在高流速下沉积通量下降的现象，并与报道的实验结果相当吻合。结果表明，拟合的 K 值可用于“评估”细菌在表面上沉积的倾向，并将其与流体动力学效应分开。
