Study on Permeability Characteristics of Porous Transparent Gels Based on Synthetic Materials

Abstract

Advanced knowledge of the permeability characteristics of transparent gels play a key role in providing a rational basis for the study of porous polymer permeability and the research on the migration behavior of superpolymer solutions. Thus, a new type of transparent gel was prepared to simulate porous media, with aim to observe and analyze the permeability characteristics of transparent gel under the conditions of our experimental design by combining a transparent soil test and simple particle image velocimetry. The experimental results showed that the permeability of the transparent gel was similar to that through actual soil. The permeability coefficients of the transparent gel under different pressure gradients varied greatly early in the experimental cycle, while changing only slightly afterward, showing an overall trend of decreasing first and then stabilizing. With the increase of the mass ratio, the permeability coefficient of the sample decreased, the distribution of the low-velocity zone of the intercepted section became wider and tended to move upward. Differences in spatial position also caused different patterns of velocity and direction. The findings presented in this paper contribute to providing a new direction for the study of porous polymer permeability and the porous migration of superpolymer solutions.

A review of fused filament fabrication of continuous natural fiber reinforced thermoplastic composites: Techniques and materials

“…99 Moreover, thicker fibers with greater tensile strength (i.e., more resistance to deformation) would require larger radii of curvature during path planning which constraints part design. [100][101][102] In addition, satisfactory polymer permeation is difficult to achieve for thicker natural continuous fibers bundles, which results in high void fraction in printed parts. Therefore, part dimension, fiber diameter, and nozzle size must be carefully considered and balanced before FFF continuous fiber printing.…”

“…Consequently, the increased layer height/thickness would increase print efficiency (i.e., decrease print time) at the cost of print resolution due to the stair‐case effect of layer slicing 99 . Moreover, thicker fibers with greater tensile strength (i.e., more resistance to deformation) would require larger radii of curvature during path planning which constraints part design 100–102 . In addition, satisfactory polymer permeation is difficult to achieve for thicker natural continuous fibers bundles, which results in high void fraction in printed parts.…”