The cylinder wake in a magnetic field aligned with the velocity

Autor:	J. Lahjomri, A. Alemany, Ph. Caperan
Rok vydání:	1993
Předmět:	Physics Mechanical Engineering Reynolds number Perturbation (astronomy) Magnetic Reynolds number Mechanics Wake Condensed Matter Physics Kinetic energy Magnetic field Physics::Fluid Dynamics symbols.namesake Classical mechanics Eddy Mechanics of Materials symbols Magnetic pressure
Zdroj:	Journal of Fluid Mechanics. 253:421
ISSN:	1469-7645 0022-1120
DOI:	10.1017/s0022112093001855
Popis:	We investigate experimentally the up- and downstream flow around an insulating cylinder in a conducting fluid subjected to an aligned magnetic field for low values of the magnetic Reynolds number Rm. For high values of the Alfven number α = B0/U0(ρμ0)½ the upstream flow is characterized by magnetic and kinematic wakes. In this configuration we have measured, for the first time, the local values of the induced magnetic field. The results were analysed in a confined situation and show that the Oseen number k = ½Rm(1-α2) is the main parameter that characterizes the perturbation. In the downstream flow the two fields of perturbations (magnetic and kinetic) are characterized by von Karman eddies. Our experiments were focused on the evolution of these eddies and show in particular that the critical Reynolds number increases strongly with the intensity of the magnetic field.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a5737deb242614b659d4617dee52afa9 https://doi.org/10.1017/s0022112093001855 Zobrazit plný text záznamu