Group Title: 7th International Conference on Multiphase Flow - ICMF 2010 Proceedings
Title: 1.7.2 - The Interfacial Shear-Stress as a Film Pumping Mechanism in Annular Pipe-Flow
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 Material Information
Title: 1.7.2 - The Interfacial Shear-Stress as a Film Pumping Mechanism in Annular Pipe-Flow Interfacial Flows
Series Title: 7th International Conference on Multiphase Flow - ICMF 2010 Proceedings
Physical Description: Conference Papers
Creator: Oliveira, G.H.
Portela, L.M.
Publisher: International Conference on Multiphase Flow (ICMF)
Publication Date: June 4, 2010
Subject: annular flow
disturbance waves
interfacial shear stress
film pumping
Abstract: In gas-liquid annular flow, the liquid phase is distributed in droplets dispersed in the gas core, and in a film covering the wall, carrying most of the liquid. This film is disturbed by waves propagating in all directions (mostly in the streamwise direction), which play a significant role in the liquid distribution in the pipe. The dynamics of these waves and how it affects the liquid distribution is still not fully understood. In horizontal or inclined pipe flow, a film pumping mechanism must exist, in order to balance the gravity and keep the film covering all the wall. Some mechanisms related to the interfacial waves have been proposed in the literature, like ’wave pumping’ and ’wave spreading’, among others. Regardless of the inclination of the pipe, the gas exerts a large net streamwise shear-stress on the liquid, which is responsible for the dragging of the film in the streamwise direction. A common approach is to model the average streamwise interfacial shear-stress through an equivalent "roughness of the film". However, this shear-stress is not uniform, since it is closely related to the shape and height of the interface and to the interfacial waves. In this work, we show that the non-uniformity in the interfacial streamwise shear-stress can be a film-pumping mechanism in the circumferential direction. We perform direct numerical simulations that allow us to separate and isolate the mechanism based on the shear stress at the interface. Different shear-stress patterns are analysed, mimicking different patterns for the height of the interface, under different conditions. The goal is to provide subsidies for the development physically-based film-pumping models.
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
 Record Information
Bibliographic ID: UF00102023
Volume ID: VID00036
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: 172-Oliveira-ICMF2010.pdf

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