By P.K. Chatterjee, B.S. Gupta
This e-book discusses the theoretical elements of absorbency in addition to the constitution, homes and function of fabrics. The chapters are prepared in an strategy for the reader to strengthen steadily via basic theories of absorbency to more effective facets of the expertise. issues lined contain medical rules of absorbency and constitution estate relationships; fabric expertise together with tremendous absorbents, non-woven, typical and artificial fibres and surfactants; absorbency dimension suggestions and expertise standpoint. The reader is supplied with present prestige info on expertise and can be trained on very important advancements in the box.
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7) , which ignores gravity, was found to agree very well with these vertical wicking data. 0 dlstance (a) (b) Fig. 11. Experimental moisture concentration profiles for water penetration into filter paper in one dimension ; (a) actual profiles; (b) profile plot with reduced distance. At large period of times from the onset of flow, gravity becomes an increasingly important factor. Gravity plays a major role in cases of large pore media such as uncompressed fluff pulp webs or foams. The flow (eq.
39] and by Takahashi . The recognition that all the concentration profiles at different times have identical shape was also made by Fujita . In radial (two-dimensional) flow experiments, the same qualitative behavior was observed. The radial advancing distances for any saturation level are proportional to the square root of time just as in the case of one-dimensional flow. As a consequence, the saturation profiles at different times have identical shapes and the concept of "reduced saturation profile" is also applicable to the radial case.
At higher initial moisture, capillary condensation occurs in the smaller pores and the capillary pressure decreases. Ijjas  recorded significant increase in penetration rate of water into sand beds when as little as 2% initial moisture is present. Dimensional changes. A commonly encountered factor is the dimensional change of the bulk volume of the porous medium when it imbibes liquid. A well known example is fluff pulp webs which "collapse" when wet ; on the other hand, pre-compressed fluff 27 webs or foams will swell when wet.
Absorbent Technology by P.K. Chatterjee, B.S. Gupta