ИСТИНА

The stability of capillary-gravity wave motion on horizontal free surface of viscous non-compressible fluid in the presence of magnetic surfactant in external magnetic field was studied. It is shown that for normal as well as for tangential external magnetic field the horizontal free liquid surface is unstable for field strength exceeding some critical value that does not depend on the elastic constant of the surfactant film. However, for oblique external magnetic field the stability of the free surface depends not only on the field value but also on the surfactant elastic constant.