Santagata, Tommaso (2020) Modellimg and experimental charaterization of unsaturated flow in absorbent and swelling porous media. [Tesi di dottorato]


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Item Type: Tesi di dottorato
Resource language: English
Title: Modellimg and experimental charaterization of unsaturated flow in absorbent and swelling porous media
Date: 2020
Number of Pages: 96
Institution: Università degli Studi di Napoli Federico II
Department: Ingegneria Chimica, dei Materiali e della Produzione Industriale
Dottorato: Ingegneria dei prodotti e dei processi industriali
Ciclo di dottorato: 32
Coordinatore del Corso di dottorato:
Salatino, PieroUNSPECIFIED
Solimene, RobertoUNSPECIFIED
Aprea, GilbertoUNSPECIFIED
Date: 2020
Number of Pages: 96
Keywords: Swelling porous media; super absorbent polymer; absorbent hygiene products
Settori scientifico-disciplinari del MIUR: Area 09 - Ingegneria industriale e dell'informazione > ING-IND/25 - Impianti chimici
Date Deposited: 22 Mar 2020 23:01
Last Modified: 04 Apr 2022 10:00

Collection description

The present study aims at characterizing relevant morphological and hydraulic properties of absorbent hygiene products (AHP), consisting of storage layers made of cellulose fluff fibres and super absorbent polymer (SAP) particles, with different SAP/fluff ratio (SFR). The dependencies of these properties (e.g. porosity and hydraulic conductivity) on the absorption extent of the SAP particles has to be clearly acknowledged, in order to properly model with continuous assumptions this particular porous system. A comprehensive tailored experimental protocol is presented for the characterization of properties and constitutive parameters relevant to AHP performance. The results have been directed to set the closure equations and constitutive parameters of multiphase flow models in which the porous media is treated as a continuum. Computational fluid dynamics simulations were used to test the obtained closure equations. The performances of the composite materials have been characterized in terms of absorption time and absorbed fluid spatial distribution upon iterated imbibition/drainage cycles. A multi-scale approach was implemented using a model based on a discrete element method (DEM). Virtual experiments in DEM simulation were carried out and compared to the lab measurements.


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