<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>In the present paper, the influence of bubble size on liquid penetration into the capillary was experimentally and numerically studied. In the experiment, bubbles were generated from a glass capillary (with an inner diameter equal to 1 mm) in a glass tank containing distilled water, tap water or an aqueous solution of calcium carbonate. These liquids differ in the value of their surface tension, which influences the bubble size. During experimental investigations, air pressure fluctuations in the gas supply system were measured. Simultaneously, the videos showing the liquids’ penetration into the capillary were recorded. Based on the videos, the time series of liquid movements inside the capillary were recovered. The numerical models were used to study the influence of bubble size on the velocity of liquid flow above the capillary and the depth of liquid penetration into the capillary. It was shown that the air volume flow rate and the surface tension have the greatest impact on the changes of pressure during a single cycle of bubble departure (Δ<italic>p</italic>). The changes in pressure during a single cycle of bubble departure determine the depth of liquid penetration into the capillary. Moreover, the values of Δ<italic>p</italic> and, consequently, the depth of liquid penetration can be modified by perturbations in the liquid velocity above the capillary outlet.</p>
</abstract>

In the present paper, the influence of bubble size on liquid penetration into the capillary was experimentally and numerically studied. In the experiment, bubbles were generated from a glass capillary (with an inner diameter equal to 1 mm) in a glass tank containing distilled water, tap water or an aqueous solution of calcium carbonate. These liquids differ in the value of their surface tension, which influences the bubble size. During experimental investigations, air pressure fluctuations in the gas supply system were measured. Simultaneously, the videos showing the liquids’ penetration into the capillary were recorded. Based on the videos, the time series of liquid movements inside the capillary were recovered. The numerical models were used to study the influence of bubble size on the velocity of liquid flow above the capillary and the depth of liquid penetration into the capillary. It was shown that the air volume flow rate and the surface tension have the greatest impact on the changes of pressure during a single cycle of bubble departure (Δp). The changes in pressure during a single cycle of bubble departure determine the depth of liquid penetration into the capillary. Moreover, the values of Δp and, consequently, the depth of liquid penetration can be modified by perturbations in the liquid velocity above the capillary outlet.

Perturbations of the Depth of Liquid Penetration Into the Capillary During Bubble Departures

Department of Mechanics and Applied Computer Science, Faculty of Mechanical Engineering

Acta Mechanica et Automatica

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

In the present paper, the influence of bubble size on liquid penetration into the capillary was experimentally and numerically studied. In the experiment,...

Perturbations of the Depth of Liquid Penetration Into the Capillary During Bubble Departures

Published Online: Nov 29, 2021

Page range: 254 - 259

Received: Sep 19, 2021

Accepted: Oct 22, 2021

DOI: https://doi.org/10.2478/ama-2021-0032

Keywords
bubbles, bubble departures, liquid movement into the capillary

© 2021 Paweł Dzienis, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Perturbations of the Depth of Liquid Penetration Into the Capillary During Bubble Departures

Published Online: Nov 29, 2021

Page range: 254 - 259

Received: Sep 19, 2021

Accepted: Oct 22, 2021

DOI: https://doi.org/10.2478/ama-2021-0032

Keywordsbubbles, bubble departures, liquid movement into the capillary

© 2021 Paweł Dzienis, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Keywords
bubbles, bubble departures, liquid movement into the capillary