Device for fining bubbles of gas contained in liquid

A device for fining bubbles of gas contained in liquid, comprising:

• at least two flow channel members having surfaces confronting each other to form a flow channel therebetween, said flow channel members comprising an outer flow channel member and an inner flow channel member having cylindrical configurations and disposed coaxially with each other, so that said confronting surfaces comprise an inner surface of said outer flow channel member and an outer surface of said inner flow channel member;
• an inlet provided on one side of said flow channel members constructed and arranged for receiving a supply of liquid premixed with gas, and an outlet provided on an opposite side of said flow channel members;
• and
• a recess surface including a first recess and a second recess and formed on at least one of confronting surfaces of said flow channel members, said first recess and said second recess extending from said inlet to said outlet, respectively, and intersecting each other at plural positions where the flow of the liquid premixed with gas in said first recess collides with that in said second recess;
• at least one of said inner and outer surfaces comprising said recess surface including said first and second recesses, said first recess being a right-hand helical recess and said second recess being a left-hand helical recess.