Characterization of bubble mobility in channel flow with fibrous porous media walls |
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| Institution: | 1. Department of Mechanical Engineering and Center for Composite Materials, University of Delaware, 202 Composites Manufacturing Science Laboratory, Newark, DE, USA;2. School of Mechanical Engineering and Research Center for Aircraft Parts Technology, Gyeongsang National University, Jinju, Republic of Korea;1. Thermodynamics Research Unit, School of Engineering, University of KwaZulu-Natal, Howard College Campus, King George V Avenue, Durban 4041, South Africa;2. Institut de Recherche en Génie Chimique et Pétrolier (IRGCP), Paris Cedex, France;3. Département de Génie des Mines, de la Métallurgie et des Matériaux, Faculté des Sciences et de Génie, Université Laval, Québec (QC) G1V 0A6, Canada;1. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China;2. Changqing Oilfield Branch Company Oil Production Plant NO.6, PetroChina, Xi''an 710021, China;1. Robert Bosch GmbH, Automotive Electronics, Tübinger-Str. 123, 72762 Reutlingen, Germany;2. Robert Bosch GmbH, Corporate Sector Research and Advanced Engineering, 70465 Stuttgart, Germany;3. German Aerospace Center (DLR), Institute of Materials Research, Linder Höhe, 51147 Cologne, Germany;1. Alberta Innovates – Technology Futures, Edmonton, Alberta T6N 1E4, Canada;2. Geological Survey of Canada, Natural Resources Canada, Sidney, British Columbia V8L 4B2, Canada;3. Computer Modeling Group Ltd., Calgary, Alberta T2L 2A6, Canada |
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| Abstract: | In composites processing, resin is introduced into a fibrous domain to cover all the empty spaces between the fibers. It is important to extract air bubbles from the domain before the resin solidifies. Failure to do so will entrap these voids in the final part, which is detrimental to its performance. Hence, there is a need to understand bubble motion in a fibrous porous domain in which the bubbles move with the resin in channels surrounded by fibrous walls. A rising bubble model is presented that consists of a single spherical void in a cylindrical axisymmetric two-phase domain of resin and air surrounded by porous media boundaries. The motion of a bubble in a channel flow with porous boundaries is modeled by replacing the walls with a slip velocity. Focus is on how the porous media permeability influences the bubble motion. A parameter called bubble mobility is defined as the ratio of bubble rise velocity to the resin free surface velocity. Results suggest that fabric permeability and fluid properties can be optimized to increase bubble mobility and ultimately lead to reduction in void content during composites processing. |
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| Keywords: | Thermoset resin Voids Porous media Slip velocity Permeability Composites processing |
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