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- Title
КОНЦЕПЦИЯ И МОДЕЛЬ МЕЗОСКОПИЧЕСКОЙ ПОРИСТОСТИ ТОНКИХ ПРОНИЦАЕ- МЫХ СРЕД
- Authors
Котюков, Ю. Д.; Левченко, В. И.; Роганков, О. В.; Швец, М. В.; Роганков, В. Б.
- Abstract
There are two main obstacles to perform the objective comparison and choice of preferable variant within the set of appropriate textile materials (TM), related to the thin permeable media: 1) the different experimental methodologies and tools usable by different authors for an estimate of water-vapor-transmission rate; 2) the different ambient conditions of such measurements and a variety of experimental means proposed, at present, for an estimate of TM-porosity. Recently we have studied, in detail, the former factor [V.B. Rogankov et al, Refrigeration Engineering and Technology, 51(1), 2015, pp.47-54] and pointed out the possible strategy to overcome this obstacle. In this work we will pay the main attention to the latter factor. The novel concept of mesoscopic (nano-) porosity of threads is formulated for any woven and non-woven TMS. The resulting alternate basic (AB-) model for theoretical estimate of effective (observable) porosity in hydrophilic and hydrophobic permeable media is developed. It is based, exclusively, on the standard (but the measuring-laboratory-condition's-dependent) measurements of so-called square mass and thickness for the wide set of 41 samples taken from 5 different experimental works. The proposed treatment of such data leads to the simple, well-founded relationships of AB-model without any adjustable coefficients. They provide a possibility to obtain the reliable estimates for the following fundamental TM-characteristics: density of moist and/or dry matrix; observable effective porosity at any level of ambient moisture; maximum hygroscopicity without the additional experiments.
- Publication
Refrigeration Engineering & Technology, 2015, Vol 51, Issue 5, p67
- ISSN
0453-8307
- Publication type
Article
- DOI
10.15673/0453-8307.5/2015.44774