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

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

This book discusses the theoretical points of absorbency in addition to the constitution, houses and function of fabrics. The chapters are prepared in an technique for the reader to boost gradually via basic theories of absorbency to simpler features of the know-how. themes coated comprise clinical rules of absorbency and constitution estate relationships; fabric expertise together with tremendous absorbents, non-woven, average and artificial fibres and surfactants; absorbency size thoughts and know-how viewpoint. The reader is supplied with present prestige details on expertise and can also be expert on very important advancements in the box.

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The fluid simply filled holes inside the fibers. This amount could be expected to be very small and neglected. Thus, one of the parameters that need to be modeled for a web is the pore volume. The model for the rate involves fluid properties, cosine of the contact angle and pore radius (see eq. 7). Other factors, such as the distribution of pore size, the shape of pores, the tortuosity and the orientation of flow channels, and the swelling characteristics of fibers, no doubt, also affect the rate [132] but they are not part of a known model and their effects are not well understood.

The pore size distribution M(6), therefore, corresponds to a "capillary pressure distribution function" N(p). Thus, there is an "equilibrium-saturation-capillary pressure" relationship, s = N(p) which is characteristic to a given porous medium and the fluid system. In fact, there usually exists more than one such "equilibrium saturation-capillary pressure" relationship, depending on whether the fluid is being filled up or being withdrawn. Such hysteresis phenomena and their measurement are discussed in Chapter XI.

A T _1 d The fibers' contribution to interstitial space is from nl fibers of type 1, n2 fibers of type 2, etc. Therefore, the total area of interstitial space bounded by three fibers but made up of different materials is given by eq. 63. Area of capillary = AT -~o Z De J (63) or, by combining eq. 63 with 53, (64) Equation 64 for the interstitial area bounded by three fibers randomly arranged, exactly equals eq. 56, developed for the unoccupied area of the triangle for the case of the parallel arrangement of fibers.

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