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EXPERIMENTAL STUDY ON THE EFFECT OF AIR FLOW ON SOAP BUBBLE FORMATION (2013)
BibTeX
@MISC{Davidson13experimentalstudy,
author = {John M. Davidson and John Michael Davidson and Advisor Sangjin Ryu},
title = {EXPERIMENTAL STUDY ON THE EFFECT OF AIR FLOW ON SOAP BUBBLE FORMATION},
year = {2013}
}
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Abstract
Soap bubbles are a common interfacial fluid dynamics phenomenon having appli-cations such as buoyant hollow spherical fillers and flow visualization of large scale airflows. In contrast to the dynamics of liquid drops in gas and gas bubbles in liquid, the dynamics of soap bubbles has not been well documented, possibly because soap bubbles have gas-liquid-gas interfaces. Having the thin-liquid-film interface seems to alter the characteristics of the bubble/drop creation process. Thus, the main objec-tive of this study is to experimentally examine how airflow develops and interacts with the soap liquid film as the film stretches and finally collapses to pinch-off. A soap bubble blowing apparatus was constructed to consistently reproduce soap bubble blowing process with various soap ring sizes, and high-speed videography was utilized to investigate the blowing process. The minimum radius of the neck of the soap liquid tube was measured when approaching pinch-off. It is seen that the minimum neck radius is approximately proportional to the time left till pinch-off by a scaling exponent of about 2/3. The exponent is 1/3 for a gas bubble in liquid and 2/3 for a liquid drop in gas. This indicates that liquid drops collapse more slowly than
Keyphrases
soap bubble liquid drop gas bubble thin-liquid-film interface soap bubble blowing apparatus minimum radius large scale airflow high-speed videography various soap ring size soap liquid tube common interfacial fluid dynamic film stretch flow visualization till pinch-off minimum neck radius scaling exponent airflow develops gas-liquid-gas interface buoyant hollow spherical filler soap liquid film soap bubble blowing process blowing process bubble drop creation process
