Abstract
The basic principles of electrohydrodynamics (EHD) are reviewed, including governing equations and boundary conditions, the applicability of EHD models, and averaged equations in alternating external fields. Dimensionless criteria for key aspects of electric and EHD processes are given. Experimental data on and theoretical treatments of basic EHD phenomena, such as transient processes, sound waves in an electric field, EHD instabilities, EHD flows, and EHD heat exchange, are discussed.