A rotating field mhd hydrostatic thrust bearing |
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Authors: | Chuen-Yen Chow and R D Brunell |
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Institution: | (1) Coop. Inst. for Research in the Environm. Sci. and Dept. of Aerospace Eng. Sci., University of Colorado, Boulder, Colo., USA;(2) Dept. of Aero-Space Engineering, University of Notre Dame, Notre Dame, Ind., USA |
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Abstract: | It is found that the load capacity of a magnetohydrodynamic thrust bearing with a rotating disk can be increased by rotating the axial magnetic field at a suitable speed in a direction opposite to that of the disk rotation. This method of improving the bearing performance is considered to be efficient if the Hartmann number is not too large. Thus for a given load, the size and weight of the magnet to be used in a thrust bearing with rotating field can be reduced considerably.Nomenclature
a
radius of plenum recess
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b
outside disk radius
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B
0
magnetic induction of applied axial magnetic field
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hE
0
1/2/a
1/2, nondimensionalized electric field
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E
0
radial electric field at r=a
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E
r
radial electric field
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h
half of lubricant film thickness
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M
(B
0
2
h
2/)1/2, Hartmann number
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P
pressure
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P
e
pressure at r=b
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P
0
pressure at r=a
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Q
volume flow rate of lubricant
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Q
0
volume flow rate of a nonrotating bearing in the absence of applied magnetic field
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r
radial coordinate
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u, v
fluid velocity components in radial and circumferential directions, respectively
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W
load capacity of bearing
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W
0
load capacity of a nonrotating bearing in the absence of a magnetic field having a flow rate which the same bearing would have at Hartmann number M
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z
axial coordinate
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azimuthal coordinate
-
coefficient of viscosity of lubricant
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e
magnetic permeability
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fluid density
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electrical conductivity
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angular velocity of rotating disk
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C
critical disk velocity at which W=0
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M
angular velocity of axial magnetic field
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optimum angular velocity of magnetic field
On leave of absence from Department of Aero-Space Engineering, University of Notre Dame, Notre Dame (Ind.), U.S.A. |
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Keywords: | |
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