Shape Oscillations of a Bubble or Drop Attached to a Capillary Tip

0428672 - ÚCHP 2015 RIV GB eng J - Journal Article
Vejražka, Jiří - Vobecká, Lucie - Orvalho, Sandra - Zedníková, Mária - Tihon, Jaroslav
Shape Oscillations of a Bubble or Drop Attached to a Capillary Tip.
Chemical Engineering Science. Roč. 116, SEP 6 (2014), s. 359-371. ISSN 0009-2509. E-ISSN 1873-4405
R&D Projects: GA ČR GAP101/11/0806; GA MŠMT(CZ) LD13018
Institutional support: RVO:67985858
Keywords : bubble oscillations * pendant drop * eigenmode frequency
Subject RIV: CI - Industrial Chemistry, Chemical Engineering
Impact factor: 2.337, year: 2014

The oscillation dynamics of bubbles and drops that are attached to the tip of a capillary are experimentally investigated to test the applicability of simplified linear analyses to real-world situations. The experiments are performed with 0.7–2.6 mm air bubbles in pure water and with 0.7–1.3 mm drops of pure water. The bubbles or drops are excited by the vertical motion of the capillary. The shape oscillations are recorded by a high-speed camera and are processed to determine the oscillation eigenmodes (their frequencies, shapes, and damping rates). If the bubbles or drops are sufficiently small , the measured characteristics of the eigenmodes will correspond to the analyses. If the bubble or drop size is sufficiently large to form a neck, the eigenmode frequency decreases and the shape oscillations will correspond to those of a free bubble. The reduction in eigenmode frequency is correlated with the ratio of the actual volume of the bubble to the detachment volume of the bubble.
Permanent Link: http://hdl.handle.net/11104/0236102