This work shows that, at creeping flow limit with small intrafloc Reynolds number, the permeability of floc can not only be affected by floc structure, but also by the external flow condition.

• 本研究则发现在低雷诺数之缓流极限下，胶羽内部透过不仅受内部结构影响，同时亦为外部流通状况之函数。