Group Title: 7th International Conference on Multiphase Flow - ICMF 2010 Proceedings
Title: 1.5.1 - Turbulence modulation by particles of the Taylor-lengthscale size: is Stokes number an appropriate indicator?
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Title: 1.5.1 - Turbulence modulation by particles of the Taylor-lengthscale size: is Stokes number an appropriate indicator? Particle-Laden Flows
Series Title: 7th International Conference on Multiphase Flow - ICMF 2010 Proceedings
Physical Description: Conference Papers
Creator: Lucci, F.
Ferrante, A.
Elghobashi, S.
Publisher: International Conference on Multiphase Flow (ICMF)
Publication Date: June 4, 2010
Subject: fully resolved particle simulations
isotropic turbulence
particle-laden turbulent flow
Abstract: It has been established both experimentally and numerically (e.g. Ferrante and Elghobashi (2003)), that the Stokes number, p= k, can be used as an indicator to determine the extent to which small particles, dp < , modify the turbulence structure, for xed values of their volume fraction, v, and mass fraction, m, where dp, p, and k are the particle diameter, response time, the Kolmogorov length- and time-scales, respectively. The objective of the present study is to investigate whether p= k can also be used as an indicator for the modulation of turbulence by particles of the Taylor-lengthscale size, i.e. dp >> . We employ DNS with an immersed boundary method to fully resolve the ow around 4800 freely moving particles of Taylor-lengthscale size (dp ) in decaying isotropic turbulence with initial Re = 110, and a grid of 5123 mesh points. Our results show that particles whose diameter dp >> and have identical p (by varying dp and/or p) can have different effects on isotropic turbulence. Thus, p= k should not be used as indicator of turbulence modulation by these `large' particles.
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: VID00028
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: 151-Lucci-ICMF2010.pdf

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