Abstract
Magnetic fluid drag reduction which is based on the character of magnetic fluid by adhered magnetic fluid inside to the boundary surface of duct for fluctuating in synchronism with current flowing in order to make stiffness boundary surface replaced flexible boundary surface is introduced. The deformation process and flowing state of magnetic fluid coating is discussed and analysed. It is found that due to reflux in it, magnetic fluid could reduce drag only at the moment that the reflux volume of magnetic fluid is equal to the flowing volume of magnetic fluid while the thickness of magnetic fluid coated layer is appropriate.
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