Add a Media Piece
default edit
Back to the Gallery

This medium is available via another website:

Click here to view it.

Title: Breakup of the tail of a bubble in a non-Newtonian fluid - 2008 DFD

Description: It is well known that the shape of an air bubble ascending in a non-Newtonian fluid is affected by the rheological properties of the fluid. In this work, a 1.5 wt. % aqueous solution of an associative polymer (hydrophobic alkali swellable emulsion) with 0.02 wt. % sodium salicylate was used. For different volumes, between 9.68 and 955 mm3, a high speed video recorded the bubble shape in motion. For the smallest volume tested, the bubble is spheroidal and behaves like a bubble in a Newtonian liquid. Increasing the bubble volume, a cusp and a tail, at the rear of the bubble, are observed. First, the tail is axisymmetric (155 mm^3); then for higher volumes, the tail becomes asymmetric and with a knife-edge shape (197 mm3). For a volume of 268 mm^3, the tail breaks into a “fish backbone” pattern. In the case of volumes higher than 268 mm^3 the tails break and split in several threads. At the moment, we do not yet have a full explanation of this breakup mechanism; its origin is certainly related to the structure and elasticity of the fluid.

Credits: Enrique Soto, Roberto Zenit, and Octavio Manero


Web Page:

Contributed By:

The eFluids editor for videos is G. M. "Bud" Homsy (
and for images is Jean Hertzberg (
Please contact them if you have any problems, questions, or concerns related to the galley or videos and images.
© Copyright on the videos is held by the contributors.
Apart from Fair Use, permission must be sought for any other purpose.