Title: Three-phase coupling of air, droplets and fibers for the spray molding manufacturing process of polyurethane-fiber-reinforced composites
Authors: Diffo Nkuété, Joseph Patrick
Wulf, Peter
Breuer, Michael  
Language: en_US
Subject (DDC): DDC - Dewey Decimal Classification::000 Informatik, Wissen, Systeme
DDC - Dewey Decimal Classification::500 Naturwissenschaften
DDC - Dewey Decimal Classification::600 Technik
Issue Date: Nov-2011
Publisher: AIP
Document Type: Conference Proceedings
Source: In: Numerical analysis and applied mathematics - ICNAAM 2011 / Simos, Theodōros *1962-*. - Melville, NY : AIP, American Inst. of Physics, 2011 . - 2011, Seite 90-93
Journal / Series / Working Paper (HSU): AIP Conference Proceedings 
Volume: 1389
Page Start: 90
Page End: 93
Publisher Place: Melville, NY
Conference: International Conference on Numerical Analysis and Applied Mathematics : ICNAAM 2011 
Abstract: 
In the present paper the authors present a multiphase flow simulation model of the interaction of a droplet-laden air flow with flexible fibers. This highly complex flow is occurring during a manufacturing process of fiber reinforced polyurethane based composites, where the liquid plastic polyurethane (PUR) is sprayed with air assistance in a tool form or on a substrate. Simultaneously chopped fibers are laterally inserted in the polyurethane-air spray cone for wetting before the entire mixture deposits on the substrate, where it starts curing. This investigation aims to compute the statistical fiber orientation and density distribution in the final composite, which will help modeling its anisotropic material properties. It is presumed that the final position and orientation of a fiber on a substrate results from its dynamics and coupled interactions with air, PUR-droplets and other fibers within the spray cone. Therefore, we present a new approach simplifying the multiply coupled interaction of the three phases. In this paper a model of the process is built, that computes the transient, 4-way-coupled behavior of the air-liquid droplets mixture with the CFD code ANSYS Fluent and the 1-way-air- and 1-way-droplet-coupled dynamics of the fibers with an extra code called FIDYST. Two approaches for the coupling of fibers with the air-droplets-mixture are presented: One considers the mixture as a pseudo-fluid (" homogenization"), the other computes a force for each of the phases separately, wherein the average momentum transfer for the fiber-droplet collision is estimated based on the probability of local collision events. © 2011 American Institute of Physics.
Organization Units (connected with the publication): Strömungsmechanik 
URL: https://api.elsevier.com/content/abstract/scopus_id/81855216317
https://ub.hsu-hh.de/DB=1.8/XMLPRS=N/PPN?PPN=715177087
ISBN: 9780735409569
ISSN: 0094243X
DOI: 10.1063/1.3636677
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