Bubble removal unit and immersion-cooling electronic device having the same

A bubble removal unit that is adapted to be mounted to an electronic member of an immersion-cooling electronic device submerged in a liquid, and that is adapted for guiding a bubble generated on a surface of the electronic member to move away from the surface, the bubble having a first diameter when attached to the surface and a second diameter after leaving the surface and before being in contact with said bubble removal unit, the first diameter being not greater than the second diameter, said bubble removal unit comprising:

• at least one coil that is adapted to be disposed above the surface of the electronic member at a set height in a removal direction with the set height being not greater than the second diameter of the bubble so as to smoothly guide the bubble to move in the removal direction into said at least one coil;
• wherein each of said at least one coil has a plurality of coil turns arranged in the removal direction, one of said plurality of coil turns that is adapted to be closest to the surface of the electronic member having a diameter not greater than the first diameter of the bubble;
• and
• wherein for every two adjacent coil turns in the removal direction, a diameter of one of said adjacent coil turns that is adapted to be closer to the surface of the electronic member is not greater than a diameter of another one of said adjacent coil turns that is adapted to be farther from the surface of the electronic member such that said plurality of coil turns are adapted for smoothly guiding the bubble to move therethrough.