Abstract
Electrohydrodynamic (EHD) drop injection method consists of injecting droplets via electro-hydrodynamic force. This EHD method can produce droplets with diameters independent on the used capillary nozzle size, even to obtain droplets with diameters of 40 times smaller than the nozzle size. Up to now, the multi-stage pulse (MSP) based EHD injection has not been well developed because the method of finding suitable MSP shape for series of droplet injections into different liquids has not been precisely defined. This paper aims at giving detail information on defining best MSP shape for droplet injections.
Highlights
IntroductionThis article presents electrohydrodynamic (EHD) injection method
This article presents electrohydrodynamic (EHD) injection method. This method uses electro-hydrodynamic force to inject micrometric water droplets into model oils, which is particular used in droplet electrocoalescence experiments in petroleum research
For multi-stage pulse (MSP) based Electrohydrodynamic (EHD) droplet injections, the crucial point is to define MSP shape which decides droplet injections, that has not been investigated in details up to now
Summary
This article presents electrohydrodynamic (EHD) injection method. This method uses electro-hydrodynamic force to inject micrometric water droplets into model oils, which is particular used in droplet electrocoalescence experiments in petroleum research. The water droplets contained in crude oil emulsion are of micrometers (Moradi et al, 2011). Research in electrocoalescence adopts traditional method to inject water drops into model oils, as they push syringes to inject drops. (Hellesø et al, 2015) injected drops with 700 μm in diameter into crude oil for drop electrocoalescence experiments. It should be noted that in real crude oil emulsions the diameter of water droplets are of some micrometers, much smaller than all the water drops used in above mentioned experiments. The EHD method is well suitable because first, it does not require complex device for droplet injections; second, with the same nozzle size it gives a large range of droplet diameters from some microns to hundreds of microns (Kim et al, 2006)
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