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 |
| Creators: | Creators Email Santagata, Tommaso tommaso.santagata@gmail.com |
| 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: | nome email Mensitieri, Giuseppe mensitie@unina.it |
| Tutor: | nome email Salatino, Piero UNSPECIFIED Solimene, Roberto UNSPECIFIED Aprea, Gilberto UNSPECIFIED |
| 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 |
| URI: | http://www.fedoa.unina.it/id/eprint/13024 |
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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