Breakup of individual colloidal aggregates in turbulent flow investigated by 3D particle tracking velocimetry

Matthaus U. Babler, Alex Liberzon, Debashish Saha, Markus Holzner, Miroslav Soos, Beat Lüthi, Wolfgang Kinzelbach

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Aggregates grown in mild shear flow are released, one at a time, into homogeneous isotropic turbulence where their breakup is recorded by three-dimensional particle tracking velocimetry (3D-PTV). The aggregates have an open structure with fractal dimension around 2.2, and their size varies from 0.9 to 3.1 mm which is large compared to the Kolmogorov length scale η = 0.15 mm. 3D-PTV allows for the simultaneous measurement of aggregate trajectories and the full velocity gradient tensor along their pathlines which enables us to access the Lagrangian stress history of individual breakup events. The analysis suggests that aggregates are mostly broken due to accumulation of drag stress over a time interval of order Kolmogorov time scale, O(τη). This finding is explained by the fact that the aggregates are large, which gives their motion inertia and which increases the time for stress propagation inside the aggregate.

Original languageEnglish
Title of host publicationMultiphase Flow Phenomena and Applications
Subtitle of host publicationMemorial Volume in Honor of Gad Hetsroni
PublisherWorld Scientific Publishing Co. Pte Ltd
Pages83-96
Number of pages14
ISBN (Electronic)9789813227392
ISBN (Print)9789813227385
DOIs
StatePublished - 8 Feb 2018
EventInternational Conference on Multiphase Flow 2016 - Firenze, Italy
Duration: 22 May 201627 May 2016
Conference number: 9
https://www.aidic.it/icmf2016/

Conference

ConferenceInternational Conference on Multiphase Flow 2016
Abbreviated titleICMF-16
Country/TerritoryItaly
City Firenze
Period22/05/1627/05/16
Internet address

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