Absorbent Technology by P.K. Chatterjee, B.S. Gupta

By P.K. Chatterjee, B.S. Gupta

This ebook discusses the theoretical points of absorbency in addition to the constitution, houses and function of fabrics. The chapters are prepared in an method for the reader to increase steadily via basic theories of absorbency to more effective facets of the expertise. themes coated contain medical ideas of absorbency and constitution estate relationships; fabric expertise together with tremendous absorbents, non-woven, common and artificial fibres and surfactants; absorbency size concepts and expertise point of view. The reader is supplied with present prestige details on know-how and is additionally knowledgeable on very important advancements in the box.

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1~Re, occurs in the case of faster flow. The critical Reynolds number above which this deviation occurs is around 1. 1 to 75. The classical correlations between porosity and flow in the non-laminar flow region with high Reynold number are available in the literature (see ref. 58, 59, 61,70). 5. UNSTEADY STATE F L O W T H R O U G H POROUS MEDIA In most practical absorbency situations the liquid movement is an unsteady state flow where the porous medium is not uniformly and Completely saturated, and where the liquid distribution throughout the medium changes with time.

Each fiber contributes 1/6 th of its volume to the volume of the triangle. The volume per unit length of the triangle (the capillary unit cell) occupied by the fibers is S and is given by: S= 1 F 6Bol_ nidi | (53) Pi J The packing factor for the triangular element is given by the following equation: 4S - ya r 43 (54) The value given by eq. 54 must equal the packing factor of the fabric element given by eq. 41. Equating the two yields the following value for the length, Y: - I 4 ATS . 1112 (55) Capillary radius, r, is defined as the radius of a circle whose area equals the unoccupied area of the triangle.

12. Five models of swollen gel structures [104]. e many cases can involve a ten- or hundred-fold increase in volume, such as in the case of the "superabsorbents". Swelling is a diffusion phenomenon driven by the affinity of the molecules of the swelling material for the molecules of the contacting fluid. Five general models of swollen gel structure [102-104] are shown in Fig. 12. The first diagram (a), a classical cross-linked network, has a swelling limit controlled by a balance between the thermodynamic forces due to polymer-solvent interactions and the entropic force of coiled polymer chains.

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