Controlled droplet generation plays a crucial role in both industrial and research applications. In this work, we demonstrate a submerged setup where a water jet is used to atomize olive oil droplets through controlled jetting. The water jet expands in a cross-flow configuration relative to the oil droplet. By tuning the jet parameters such as Reynolds number, Weber number, and jet-to-droplet distance, we achieve precise generation of single droplets ranging from 500 μm to 5 mm, with minimal satellite formation. At high jet Reynolds numbers (~15,000), the system enables intense atomization, producing extremely fine droplets. At such high Reynolds number, the droplet takes on a shape that strikingly resembles the eerie, ghostly figures of the dementors from the Harry Potter movies!
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