Group Title: 7th International Conference on Multiphase Flow - ICMF 2010 Proceedings
Title: 13.2.2 - Dynamics of droplet formation in a microfluidic T-Junction
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Title: 13.2.2 - Dynamics of droplet formation in a microfluidic T-Junction Micro and Nano-Scale Multiphase Flows
Series Title: 7th International Conference on Multiphase Flow - ICMF 2010 Proceedings
Physical Description: Conference Papers
Creator: Amaya-Bower, L.
Lee, T.
Publisher: International Conference on Multiphase Flow (ICMF)
Publication Date: June 4, 2010
Subject: Lattice Boltzmann method
T-junction microchannel
drop formation
Abstract: A stable Lattice Boltzmann equation (LBE) method based on the Cahn-Hilliard diffuse interface approach is used to investigate the dynamic behavior of two immiscible fluids (continuous and dispersed) during the droplet formation process in a microfluidic T-junction. Droplet formation process has different regimes which correspond to the primary forces acting on the system. Forces in the system and transition from regime to regime are usually described by the value of Capillary number (Ca). Squeezing regime is governed by the interfacial forces and dripping regime by the shear forces. Previous studies predict that in the squeezing regime with low Ca, is mainly characterized by the ratio of mass flow rates (Q = Qd Qc ). As the ratio increases, the size of the droplet increases and its formation frequency decreases. In the dripping regime with high Ca, flow is governed by Q and viscosity ratio (λ = d c ). λ is proportional to droplet size and inversely proportional to formation frequency. Current study performs a systematic analysis which establishes that there are three factors besides Ca that have an impact in the formation process in these regimes Q, λ and surface wettability. Simulations are performed using a range of 10−3<Ca<10−1, 10−1<Q<101, and 10−1<λ<1, and the contact angle of the surface is varied from 30◦ to 150◦.
General Note: The International Conference on Multiphase Flow (ICMF) first was held in Tsukuba, Japan in 1991 and the second ICMF took place in Kyoto, Japan in 1995. During this conference, it was decided to establish an International Governing Board which oversees the major aspects of the conference and makes decisions about future conference locations. Due to the great importance of the field, it was furthermore decided to hold the conference every three years successively in Asia including Australia, Europe including Africa, Russia and the Near East and America. Hence, ICMF 1998 was held in Lyon, France, ICMF 2001 in New Orleans, USA, ICMF 2004 in Yokohama, Japan, and ICMF 2007 in Leipzig, Germany. ICMF-2010 is devoted to all aspects of Multiphase Flow. Researchers from all over the world gathered in order to introduce their recent advances in the field and thereby promote the exchange of new ideas, results and techniques. The conference is a key event in Multiphase Flow and supports the advancement of science in this very important field. The major research topics relevant for the conference are as follows: Bio-Fluid Dynamics; Boiling; Bubbly Flows; Cavitation; Colloidal and Suspension Dynamics; Collision, Agglomeration and Breakup; Computational Techniques for Multiphase Flows; Droplet Flows; Environmental and Geophysical Flows; Experimental Methods for Multiphase Flows; Fluidized and Circulating Fluidized Beds; Fluid Structure Interactions; Granular Media; Industrial Applications; Instabilities; Interfacial Flows; Micro and Nano-Scale Multiphase Flows; Microgravity in Two-Phase Flow; Multiphase Flows with Heat and Mass Transfer; Non-Newtonian Multiphase Flows; Particle-Laden Flows; Particle, Bubble and Drop Dynamics; Reactive Multiphase Flows
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Bibliographic ID: UF00102023
Volume ID: VID00320
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: 1322-AmayaBower-ICFM2010.pdf

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