Validity of Particle Image Velocimetry Measurements in Electrohydrodynamic Flows
摘要
Bulk conduction and ion injection are the two main electrical processes utilized to generate fluid motion in an isothermal dielectric liquid. The velocity of these flows is measured using several measuring techniques. The Particle Image Velocimetry (PIV) technique is well-known in the field of fluid mechanics. The flow must be seeded with tiny tracer particles in order to obtain global velocity fields. Therefore, it is crucial to demonstrate that these particles are not excessively intrusive and that the motion of the liquid is unaffected by their existence, specifically in electrohydrodynamic (EHD) flows. After selecting a suitable tracer type for the experiments, the effect of the concentration on the recorded velocity by PIV is measured. The PIV method validity is investigated in this paper. Experiments are conducted on a typical two-dimensional charged plume. A fluid flow is generated from a sharp blade tip and directed toward a flat plate by the simple application of a DC voltage, with negative or positive polarity.