MAGNETOHYDROSTATIC EQUILIBRIA OF FERROFLUID DROPS IN EXTERNAL MAGNETIC FIELDS

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Abstract
Equilibrium axisymmetric shapes of sessile drops of ferromagnetic liquid in an imposed magnetic field of up to 200 gauss have been predicted theoretically and measured. The argreement is good when due account is taken of the wetting characteristics of the liquid on the substrate as well as of the magnetic susceptibility of the liquid. The dependence of susceptibility on field strength (i.e. nonlinearity of magnetization with respect to field strength) can be significant. The results show why in the range of field strength of 140 to 200 gauss, a sessile drop elongates markedly in the direction of the applied field. Careful observations indicate that the recently advanced contact angle seen under low magnification is independent of field strength even though the apparent contact angle seen on a larger scale seems to change.

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