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

Lake, Bruce M. (1971) Velocity measurements in regions of upstream influence of a body in aligned-fields MHD flow. Journal of Fluid Mechanics, 50 (2). pp. 209-231. ISSN 0022-1120. http://resolver.caltech.edu/CaltechAUTHORS:20120809-145752806

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1017/S0022112071002544DOIUNSPECIFIED
http://journals.cambridge.org/abstract_S0022112071002544PublisherUNSPECIFIED
Additional Information:© 1971 Cambridge University Press. Received 17 March 1971; in revised form 1 June 1971. This work was supported by the Office of Naval Research under contract no. N00014-67-A-0094-001 and submitted in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Aeronautics, California Institute of Technology. The guidance of Professor H. W. Liepmann throughout the course of the work is gratefully acknowledged. The author would also like to thank Professor B. H. Suzuki of the University of Southern California and Professor J.A. Shercliff of the University of Warwick for many helpful discussions.
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Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-67-A-0094-001
Record Number:CaltechAUTHORS:20120809-145752806
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120809-145752806
Official Citation:Bruce M. Lake (1971). Velocity measurements in regions of upstream influence of a body in aligned-fields MHD flow. Journal of Fluid Mechanics, 50, pp 209-231 doi:10.1017/S0022112071002544
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33063
Collection:CaltechAUTHORS
Deposited By: Aucoeur Ngo
Deposited On:09 Aug 2012 23:19
Last Modified:26 Dec 2012 15:55

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