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 technique for the reader to enhance steadily via basic theories of absorbency to simpler features of the know-how. themes lined contain medical rules of absorbency and constitution estate relationships; fabric expertise together with great absorbents, non-woven, average and artificial fibres and surfactants; absorbency size recommendations and know-how standpoint. The reader is supplied with present prestige info on know-how and can also be expert on very important advancements in the box.
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The differential form of Darcy's law is more useful in unsteady state flow problems. Equation 12 is often expressed in terms of the "friction factor"f defined as -DfAP/plv2Lo and the "Reynolds Number" Re redefined a s Dfvpt/r I. The relationship between friction factor and "Reynolds Number" is given by: f= Re (15) where Df is the effective average diameter of particles or fibers, and v is the flow velocity. These dimensionless variables, f and Re, are common concepts of fluid mechanics . Reynolds number is a measure of flow momentum and is often used as indicator for differentiating laminar and turbulent flow regimes.
The fraction of the bulk volume that makes up the solid walls is thus 1 - 0If Pb,,tk is the bulk density of the porous medium and p is the density of the material making up the medium, then the porosity is given by = 1 Pbulk (9) P If the porous medium is made up of regularly packed particles of uniform size and shape, the porosity can be calculated from purely geometrical consideration. 259 . Assuming there is no change in dimension, if the entire pore space is filled up with the absorbed liquid, the porous sample is said to be fully saturated and the maximum absorption capacity (C) of the sample can be defined as the mass of liquid absorbed per unit mass of dry solid medium (eq.
2. 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"equilibrium saturation-capillary pressure" relationship, depending on whether the fluid is being filled up or being withdrawn.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.
Absorbent Technology by P.K. Chatterjee, B.S. Gupta