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POF23-127102

Dispersion of ferrofluid aggregates in steady flows

Alicia M. Williams and Pavlos P. Vlachos

The authors present a study of ferrofluid aggregates interacting with a magnetically non-susceptible fluid in the presence of two different applied magnetic fields. Focused shadowgraphs of the interaction reveals three regimes of aggregate dynamics over the span of Reynolds numbers studied: stable, transitional, and shedding.

POF23-121702

The relationship between the velocity skewness and the amplitude modulation of the small scale by the large scale in turbulent boundary layers

Romain Mathis, Ivan Marusic, Nicholas Hutchins, and K. R. Sreenivasan

In this study, the authors assess this apparent relationship and show that the Reynolds number trend in the skewness profile of u is strongly related to the amplitude modulation effect of the small scales by the large. This observation also leads to an alternative diagnostic for the amplitude modulation effect, which is one component of the skewness factor based on a scale decomposition.

pof23-111702

Orientational order in concentrated suspensions of spherical microswimmers

Arthur A. Evans, Takuji Ishikawa, Takami Yamaguchi, and Eric Lauga

The authors use numerical simulations to probe the dynamics of concentrated suspensions of spherical microswimmers interacting hydrodynamically. Unlike previous work, it is shown that isotropic suspensions of spherical swimmers are also always unstable.

pof23-113302

Rheology of binary granular mixtures in the dense flow regime

Anurag Tripathi and D. V. Khakhar

Results are presented for a single component system and binary mixtures with particles of different size and density. Inclination angles, composition, size ratios and density ratios are varied to obtain different segregated configurations at equilibrium.

Non-axisymmetric impact creates pineapple-shaped cavity
AIP would like to apologize for a misprint in the 2012 Gallery of Fluid Motion calendar. The authors of the paper, "Non-axisymmetric impact creates pineapple-shaped cavity" should be Oscar R. Enríquez, Ivo R. Peters, Stephan Gekle, Laura E. Schmidt, Devaraj van der Meer, and Detlef Lohse.

Gallery of Fluid Motion

Announcements

Physics of Fluids changing to one column format

As of the January 2012 issue, Physics of Fluids is changing from the two column format that has been used since the founding of the journal, to a single column format. We are doing this primarily because we recognize that an increasing number of readers read the papers online, and for this the single-column format is much more convenient. The page limitations for Letters and for other papers that are limited in length will be adjusted to account for the decrease in information on each page. Please refer to the instructions for authors. We hope that this new format will be received positively by our community of readers and authors.

John Kim and Gary Leal, Editors

AIP Publishing unveils new high profile cover design for its portfolio of journals
For more information and to preview the new AIP journal covers, visit: journals.aip.org.

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