Analysis and characterization of relative permeability and capillary pressure for free surface flow of a viscous fluid across an array of aligned cylindrical fibers

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:245

Article

Dimitrovova, Z ; Advani, SG

关键词: dual porous media;    liquid composite molding;    relative permeability;    capillary pressure;    surface tension;    free surface flow;   

DOI  :  10.1006/jcis.2001.8003

来源: Elsevier

【 摘 要 】

In LCM processes of fiber-reinforced composite manufacturing, resin is injected into a closed mold with a preplaced stationary fiber preform. If these preforms are created from fiber tows, resin progression at the microlevel during infiltration is often non-uniform. Consequently, macroscopic description of the filling phase requires a theory of flow through unsaturated porous media in which the transition (partly saturated) region must be taken into account. Unsaturated flows must consider surface tension effects; therefore, capillary pressure and relative permeability must be included in governing equations. This paper presents a methodology to determine relative permeability and macroscopic capillary pressure for simple flows. The results lead to important conclusions and the methodology can be generalized to other flow fields. (C) 2002 Elsevier Science.

【 授权许可】

Free