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Modal analysis of magnetic microconvection

F. G. Ergin1 - B. B. Watz1 - K. Ērglis2 - A. Cēbers2

1 Dantec Dynamics A/S, Tonsbakken 16-18, Skovlunde, 2740 Denmark
2 Department of Physics, University of Latvia, 8 Zellu str., Riga, LV-1002 Latvia }

Experiments are performed to investigate magnetic microconvection in a microfluidic Hele--Shaw cell. Time resolved velocity measurements are performed using MicroPIV, where particle image contrast was enhanced using local contrast normalisation and difference of Gaussian filters. Spatial velocity modes are computed using Proper Orthogonal Decomposition, where high-energy modes are used for flow reconstruction, thereby filtering the flow field from noise. Stability analysis is performed using Oscillating Pattern Decomposition, where the least stable and the most stable modes are identified along with their decay rates and frequencies. Interface location is estimated using the Prewitt edge detection filter together with a combination of standard image processing functions. Time resolved information on velocity and interface location provides new data on magnetic microconvection fingering and opens new possibilities for validation of computational and theoretical studies. Modal decomposition of experimental data reveals the dominant modes in magnetic microconvection, and this information can be used in the design of magnetic micromixers. Tables 2, Figs 33, Refs 23.

Magnetohydrodynamics 50, No. 4, 339-352, 2014 [PDF, 11.43 Mb]

Copyright: Institute of Physics, University of Latvia
Electronic edition ISSN 1574-0579
Printed edition ISSN 0024-998X