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Velocity measurements in regions of upstream influence of a body in aligned-fields MHD flow

Published online by Cambridge University Press:  29 March 2006

Bruce M. Lake
Bruce M. Lake
Affiliation:
California Institute of Technology, Pasadena, California Present address: TRW Systems, Redondo Beach, California.
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Abstract

Experiments are described in which velocities were measured ahead of a semi-infinite Rankine body moving parallel to a uniform magnetic field in a conducting fluid. The flow disturbance in front of the body is found to increase in length as N½, where N is the interaction parameter. In most of the experiments this parameter was varied from 4 to about 50. Measurements made along the axis of symmetry in the flow show that there is a relatively short region of stagnant fluid directly ahead of the body. The major part of the disturbance is found to consist of a much longer region in which the flow undergoes transition from conditions in the free stream to conditions near the body. Velocity profiles across the flow in this region show that for increased N, at a fixed distance ahead of the body, the velocity defect increases and the disturbance becomes more confined radially. Although the radial gradients in the flow increase with N, they are found to be much smaller than would be expected in a flow containing thin current layers. A physical model of the flow which has currents and pressures consistent with these results is discussed.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 50 , Issue 2 , 29 November 1971 , pp. 209 - 231
Copyright
© 1971 Cambridge University Press

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References

Ahlstrom, H. G. 1963 Experiments on the upstream wake in magneto-fluid dynamics. J. Fluid Mech. 15, 205.Google Scholar
Childress, S. 1963a On the flow of a conducting fluid of small viscosity. JPL Tech. Report no. 32-351.Google Scholar
Childress, S. 1963b The effect of a strong magnetic field on two-dimensional flows of a conducting fluid. J. Fluid Mech. 15, 429.
Lake, B. M. 1969 Velocity measurements ahead of a semi-infinite body in magneto-hydrodynamic flow with aligned fields. Ph.D. Thesis, California Institute of Technology.
Liepmann, H. W., Hoult, D. P. & Ahlstrom, H. G. 1962 Concept, construction, and preliminary use of a facility for experimental studies in magneto-fluid dynamics. Mizellen der Angewandten Mechanick, p. 175. Berlin: Akademie.
Malcolm, D. G. 1969 Some aspects of turbulence measurements in liquid mercury using cylindrical quartz-insulated hot-film sensors. J. Fluid Mech. 37, 701.Google Scholar
Maxworthy, T. 1962 Measurements of drag and wake structure in magneto-fluid dyanamic flow about a sphere. Proc. Heat Transfer and Fluid Mech. Inst. p. 197. Stanford University Press.
Maxworthy, T. 1968 Experimental studies in magneto-fluid dynamics: pressure distribution measurements around a sphere. J. Fluid Mech. 31, 801.Google Scholar
Maxworthy, T. 1969 Experimental studies in magneto-fluid dynamics: flow over a sphere with a cylindrical afterbody. J. Fluid Mech. 35, 411.Google Scholar
Sajben, M. 1965 Hot-wire anemometer in liquid mercury. Rev. Sci. Instrum. 36, 945.Google Scholar
Shercliff, J. A. 1965 A Textbook of Magnetohydrodynamics. Pergamon.
Suzuki, B. H. 1967 Magneto-fluid dynamic drag measurements on semi-infinite bodies in aligned fields. Ph.D. Thesis, California Institute of Technology.
Tamada, K. 1962 Flow of a slightly conducting fluid past a circular cylinder with strong, aligned field. Phys. Fluids, 5, 817.Google Scholar
Yonas, G. 1966 Aligned-fields, magneto-fluid dynamic flow past bodies. Ph.D. Thesis, California Institute of Technology.