The electrohydrodynamical (EHD) liquid-jets induced by the mechanism in which is referred to as pure conduction pumping were investigated in isothermal weakly conducting liquids, HFC43-10 and HCFC123. The properties of liquid-jet (flow velocity, pumping pressure and flow pattern) were examined by using a grounded electrode with four different types against a pseudo-doughnut electrode under an applied dc voltage. These electrode systems gave rise to a powerful liquid-jet, but in working liquids used here, there was the effect of voltage polarity on the flow direction. In order to create a more effective liquid-jet with a high directivity, the special nozzle (which is referred to as conical nozzle in this paper) was used together with the electrode system. This nozzle can make a distinctive pattern (spiral structure) of jets emerging from the outlet of nozzle. In this paper, the spiral structure of liquid-jets has been analyzed using the basic equations of fluid mechanics.
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