USB humidifier loaded with kerosene.

Well it had to be tried. The USB powered water atomiser loaded up with kerosene instead. It produces a good plume from the kerosene and it does sustain flame albeit a bit randomly.
I also tried isopropanol, but it seemed to struggle to atomise it, and the resultant stream did not readily support a flame.

If you enjoy the videos on this channel you can help support it with a dollar for coffee, cookies and combustible devices at https://www.patreon.com/bigclive