| dc.description.abstract | The traditional silicon covers is mainly on way to rotate coating.The liquid covers,centrifugal force make the stability finger happen.This experiment is different from the traditional silicon covers coating experiment on ring type coating.Observe ring coating in different to viscosous silicon and rotate radius.The experimental result finds that as for ring type coating, its critical radius does not like increase with the central type has first increasing and after decreases, but the steady trend appears. The unstably finger,increase rapidly after its growth trend is steady first. The wavelength can be divided into three sections, steadily and lower the speed ,steadily.On different viscosity comparison ,find low viscosity because low viscid force make coating radius than high viscosity,centrifugal force make the critical radius to grow up with higher speed even more, the unstable finger is produced with higher speed too, But the external diameter of the coating and unstable finger increase cause the wavelength small than high viscosity.
In application,we can know on , 4 < Bo, the central coating is suitable than annular coating , and 4 < Bo <626, the annular coating is suitable than central coating .At Bo > 626, the differences between them are not big. | en_US |