1. Experimental characterization of an extended electrohydrodynamic cone-jet with a hemispherical nozzle
- Author
-
Azadeh Kebriaee, A. Rajabi, S. R. Pejman Sereshkeh, S. A. A. Razavi Haeri, M.R. Morad, Elahe Javadi, and Hamidreza Nasiri
- Subjects
Fluid Flow and Transfer Processes ,Physics ,Jet (fluid) ,Plane (geometry) ,Mechanical Engineering ,Nozzle ,Computational Mechanics ,02 engineering and technology ,Mechanics ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Instability ,010305 fluids & plasmas ,Volumetric flow rate ,Physics::Fluid Dynamics ,Mechanics of Materials ,0103 physical sciences ,Electrohydrodynamics ,0210 nano-technology ,Envelope (mathematics) ,Dimensionless quantity - Abstract
An extended Taylor cone-jet mode is experimentally characterized using a recently introduced hemispherical nozzle. Ethanol is used as the working fluid, and the nozzle produces a much broader range of flow rate and stability of the cone-jet mode. High-resolution images are captured using a high-power light-emitting diode in precise lighting operations to characterize the liquid behavior. Various regimes in the extended cone-jet mode are recognized and mapped in a plane of electro-Weber and Bond numbers. The cone profiles are quantified regarding dimensionless groups, and a related self-similarity is introduced. The cone elongates with the electro-Weber number but retracts as the Bond number increases. The cone and jet diameters are also quantified from the nozzle exit to where the jet begins a transition to instability. It is shown that jet diameter increases with the electro-Weber number powered by 0.75, but it is independent of the Bond number. The meniscus lengths are reported at different electro-Weber and Bond numbers too, and the corresponding correlations are obtained. Finally, jet whipping and spray envelopes are illustrated at various dimensionless numbers, while a wider spray envelope and a dual distribution are recognized at higher electro-Weber numbers.
- Published
- 2018