高频脉冲电场中液滴的运动与变形

In petroleum industry, high electric fields are used in the separation of water drops from oil phase.In this paper based on theoretical research, the kinematic and deformation characteristics of water droplets in oil under high-frequency impulse electric field have been experimentally investigated. The experiment system combines the high-speed viedo device with the microscope. The research concerns the influences of frequency and field strength on the droplets under the applied high-frequency pulsed electric fields. Besides the frequency and field strength of the pulsed electric fields, this paper also discusses how the types of electric field affect the motion and diformation of droplets. Experiment results illustrate the deformation characteristics of water droplets in single impulse electric field. The influences of impulse frequency and field strength on the kinematic characteristics of water droplets is analyzed. Results also indicate that the droplets (diameter<100μm) cannot deform in the high-frequency impulse electric field and thus the droplets can be regarded as rigid spheres in these electric fields. However, the kenetics of droplets has been obviously influenced in the impulse electric field. Droplet velocity increases with increasing impulse frequency and electric field intensity. The variation speed of displacement and instantaneous velocity rises with increase of impulse frequency.