Abstract
The adhesion of bubbles inside polymer tubes for liquid infusion is a problem leading to inconsistency of the amount of liquid infused. We treated the inside of a polymer tube with atmospheric pressure plasma to create the hydrophilic property and actually attempted to verify the adhesion restraint of bubbles. When the flow velocity was changed to 0.008-0.35m/s, the adhesion of bubbles was observed in all cases using the untreated tube. On the other hand, the adhesion of bubbles was not observed at 0.03m/s or more in the plasma-treated tube. By the plasma treatment, the contact angle of a bubble changed to 61° from 107° in the PVC tube. The change corresponds to 0.26 times decrease in the work to be generated as the bubbles adhere, and it corresponds to 15 times increase in the force to push the bubbles.
