Abstract
We measure the minimum liquid flow rate Qmin to produce steady jetting in gaseous flow focusing with orifices of diameters down to 30μm. We compare the results obtained for different diameters and liquids. Using dimensional analysis, we determine the influence of the gas viscosity on this stability limit. For low and moderately low-viscosity liquids, there is an optimum value of the gas viscosity for which Qmin reaches its lowest value. This optimum value leads to the minimum jet diameter in front of the discharge orifice.
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