Patent ID: 6579490
Filing Date: 2003-06-17
Classification: B22D,C22B,F27B,Y02P

Abstract:
A method for generating compression waves in a conductive liquid, comprising the steps of:providing a conductive liquid in a vessel; using an ac electromagnetic force applying means to generate compression waves in the conductive liquid contained in the vessel; and controlling the ac electromagnetic force applying means so that an ac frequency â€œfâ€  of the ac electromagnetic force applying means is set only within the range defined by the following expression 1: 2L2&it;Ï€&it;â€ƒ&it;Î¼&it;â€ƒ&it;Ïƒ&LessFullEqual;f&LessFullEqual;c2&it;Î¼&it;â€ƒ&it;Ïƒ2&it;â€ƒ&it;Ï€wherein f is a major frequency when a waveform of an electromagnetic force is developed by the Fourier transform, in case of the waveform being a non-sine wave, L is a characteristic length of the system including one of a depth or a radius of the vessel containing the conductive liquid, &mgr; is a permeability of the conductive liquid, &sgr; is an electric conductivity of the conductive liquid, and c is a propagation velocity of the compression waves in the conductive liquid.