Bubble formation in 4 mm gap vessel

[wahaned]

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Hi,

I have a vessel I 3D printed to investigate single bubble rise. The vessel has a 4 mm gap separated by acrylic panels. This is essentially my viewing chamber where I can record the bubble motion. The vessel is open to atmosphere.

The bubble generation mechanism is composed of a syringe pump and glass capillary tube (Internal Diameter of 0.45 mm). I connect a 1/4” air line hose from the syringe to the capillary
The bubble is formed at the tip of the capillary and rises in water. I am using a 20 cc syringe and the flow rate for the pump is 30 ml/h. The distance from the capillary tip to the interface of the liquid is 160 mm

The issue I am currently having is consistent single bubble formation. It seems water wicks into the capillary and the air flow rate cannot displace the liquid. As a result I have included a check valve between the syringe and capillary to prevent this backfill of water into the capillary and I have also shortened the hose length from the capillary to check valve.

However I am still facing the issue of inconsistent single bubble generation. Even when I increase the flow rate I am unable to get consistent bubbles being generated.

Any advice on this will be greatly appreciated.

Regards
Wahaned

 

[berkeman]

Welcome to PF.

Can you attach some pictures and a diagram of the setup? Use the "Attach files" link below the Edit window to upload PDF or JPEG files. Thanks.