Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf
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Electromagnetic ﬂow control in poor conductors
Albrecht, T.; Stiller, J.; Metzkes, H.; Weier, T.; Gerbeth, G.
Lorentz force-based ﬂow control in materials with low electrical conductivity has a long history back to the ﬁrst half of the 19th century. This review will focus on developments during the last two decades, collecting results from numerical simulations and laboratory experiments. Typically, the actuators consist of permanent magnets and electrodes ﬂush-mounted with the surface, generating Lorentz forces in the ﬂuid layers adjacent to the wall. We will discuss the application of Lorentz forces to reduce friction drag in turbulent boundary layers and to delay boundary layer transition. The control of separated ﬂows and shear layers is another key aspect of the review. Energetic eﬃciency, one of the main criteria for ﬂow control, and its relation to typical operating conditions will be analyzed as well. Lorentz forces can be successfully used to control a broad range of ﬂow phenomena and are a versatile tool for basic ﬂuid dynamics research. However their current applicability in large scale systems is hampered by the low electrical to mechanical eﬃciency intrinsic to actuators based on the magnetic ﬁelds delivered by today’s permanent magnets.
Keywords: EMHD; flow control; boundary layer control; separation control; transition control
European Physical Journal - Special Topics 220(2013), 275-285