Computation of magnetic liquid free surface shape in a quasi-homogeneous magnetic field with Differential Evolution

2017 ◽  
Author(s):  
M. Trbusic ◽  
A. Hamler
Keyword(s):  
Magnetic Field ◽  
Free Surface ◽  
Differential Evolution ◽  
Homogeneous Magnetic Field ◽  
Surface Shape ◽  
Magnetic Liquid ◽  
Liquid Free Surface ◽  
Free Surface Shape

An experimental study on magnetic field distribution above a magnetic liquid free surface

2020 ◽  
Vol 509 ◽  
pp. 166903 ◽  
Author(s):  
Mislav Trbušić ◽  
Viktor Goričan ◽  
Miloš Beković ◽  
Marko Jesenik ◽  
Mladen Trlep ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Experimental Study ◽  
Free Surface ◽  
Field Distribution ◽  
Magnetic Field Distribution ◽  
Magnetic Liquid ◽  
Liquid Free Surface

Dynamics of a Partially Full Cylinder Containing a Magnetic Liquid in a Magnetic Field

1976 ◽  
Vol 43 (3) ◽  
pp. 497-501
Author(s):  
D. R. Tichenor ◽  
X. J. R. Avula
Keyword(s):  
Magnetic Field ◽  
Free Surface ◽  
Circular Cylinder ◽  
Plane Surface ◽  
Equations Of Motion ◽  
Magnetic Liquid ◽  
Transient Motion ◽  
Thin Walled ◽  
Inclined Planes ◽  
The Magnetic Field

This study is concerned with the transient motion of an infinitely long thin-walled circular cylinder partially filled with a magnetic liquid under magnetic and nonmagnetic forces. Starting from rest the cylinder is constrained to roll without slipping on a plane surface while the contained fluid with a rectangular free surface is simultaneously subjected to a magnetic field parallel to the plane by activating a magnet located ahead of the cylinder. The nonmagnetic force on the cylinder and its contents is provided by the gravity. Assuming negligible viscous dissipation Lagrange’s equations of motion are derived and solved to obtain the motion of the cylinder and the liquid subsequent to the application of the magnetic field. Results are presented in a nondimensional form for motion on horizontal and inclined planes under different magnetic strengths.

Investigation of Steady-State Drawing Force and Heat Transfer in Polymer Optical Fiber Manufacturing

2004 ◽  
Vol 126 (2) ◽  
pp. 236-243 ◽  
Author(s):  
Hayden M. Reeve ◽  
Ann M. Mescher ◽  
Ashley F. Emery
Keyword(s):  
Heat Transfer ◽  
Free Surface ◽  
Optical Fiber ◽  
Conjugate Problem ◽  
Surface Shape ◽  
Polymer Optical Fiber ◽  
Draw Force ◽  
Free Surface Shape ◽  
Cylindrical Furnace ◽  
Fiber Manufacturing

The force required to draw a polymer preform into optical fiber is predicted and measured, along with the resultant free surface shape of the polymer, as it is heated in an enclosed cylindrical furnace. The draw force is a function of the highly temperature dependent polymer viscosity. Therefore accurate prediction of the draw force relies critically on the predicted heat transfer within the furnace. In this investigation, FIDAP was used to solve the full axi-symmetric conjugate problem, including natural convection, thermal radiation, and prediction of the polymer free surface. Measured and predicted shapes of the polymer free surface compared well for a range of preform diameters, draw speeds, and furnace temperatures. The predicted draw forces were typically within 20% of the experimentally measured values, with the draw force being very sensitive to both the furnace wall temperature and to the feed rate of the polymer.

Magnetic Fluid Bridge between Coaxial Cylinders with a Line Conductor in Case of Wetting

2015 ◽  
Vol 233-234 ◽  
pp. 335-338 ◽  
Author(s):  
Alexandra Vinogradova ◽  
Vera Naletova ◽  
Vladimir Turkov
Keyword(s):  
Magnetic Field ◽  
Free Surface ◽  
Analytical Solution ◽  
Magnetic Fluid ◽  
Axially Symmetric ◽  
Magnetic Liquid ◽  
Coaxial Cylinders ◽  
Straight Wire ◽  
A Current ◽  
Symmetric Shape

We consider a heavy, incompressible, homogenous, isothermal magnetic fluid between two coaxial cylinders in case of wetting. There is a current-carrying straight wire on the axis of these cylinders. The magnetic fluid is immersed in a non-magnetic liquid with the same density (the case of hydroimponderability). We apply the Langevin law to describe a magnetic fluid magnetization. Using the general analytical solution for any axially symmetric shape of the magnetic fluid free surface in any axisymmetric magnetic field, we investigate the break-up and the rebuilding of the magnetic fluid bridge in case of wetting.

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