Solid-state fan
Encyclopedia
A solid-state fan is a device used to produce an airflow with no moving parts
Moving parts
The moving parts of a machine are those parts of it that move. Machines comprise both moving and fixed parts. The moving parts have controlled and constrained motions....

. Such a device may use the principle of electro-aerodynamic pumping, which is based on corona discharge
Corona discharge
In electricity, a corona discharge is an electrical discharge brought on by the ionization of a fluid surrounding a conductor that is electrically energized...

.

It has advantages over mechanical fans such as that it is noiseless and more reliable.
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