Self-Propulsion of Liquid Marbles: Leidenfrost-Like Levitation Driven by the Marangoni Flow

Seminar
Speaker
Edward Bormashenko
Date
22/06/2015 - 15:00 - 13:30Add to Calendar 2015-06-22 13:30:00 2015-06-22 15:00:00 Self-Propulsion of Liquid Marbles: Leidenfrost-Like Levitation Driven by the Marangoni Flow Self-propulsion of liquid marbles filled with aqueous alcohol solutions and placed on a water surface is reported. The characteristic of velocity of the marbles is ca. 0.1 m/s. The phenomenon of self-propulsion is related to the Marangoni solutocapillary flow caused by the condensation of alcohol, evaporated from the liquid marble, on a water surface. The Marangoni flow in turn enhances the evaporation of alcohol from marbles. Addition of alcohol to the water supporting the marbles suppresses the self-propulsion. The propulsion of liquid marbles is mainly stopped by water drag. The velocity of the center of mass of marbles grows with the increase of the concentration of alcohol in a marble. The velocity of marbles’ self-propulsion is independent on their volume. Impact of external fields on the self-propulsion is discussed. Host: Eli Sloutskin, Physics Department (phone. 03 - 738 4506; cell. 054 - 393 8246)Those of you who may be interested in talking with Prof. Bormashenko should mail me (eli.sloutskin@biu.ac.il), listing their preferred time.     Room 301, Physics Bld. 202 המחלקה לפיזיקה physics.dept@mail.biu.ac.il Asia/Jerusalem public
Place
Room 301, Physics Bld. 202
Abstract

Self-propulsion of liquid marbles filled with aqueous alcohol solutions and placed on a water surface is reported. The characteristic of velocity of the marbles is ca. 0.1 m/s. The phenomenon of self-propulsion is related to the Marangoni solutocapillary flow caused by the condensation of alcohol, evaporated from the liquid marble, on a water surface. The Marangoni flow in turn enhances the evaporation of alcohol from marbles. Addition of alcohol to the water supporting the marbles suppresses the self-propulsion. The propulsion of liquid marbles is mainly stopped by water drag. The velocity of the center of mass of marbles grows with the increase of the concentration of alcohol in a marble. The velocity of marbles’ self-propulsion is independent on their volume. Impact of external fields on the self-propulsion is discussed.

Host: Eli Sloutskin, Physics Department (phone. 03 - 738 4506; cell. 054 - 393 8246)
Those of you who may be interested in talking with Prof. Bormashenko should mail me (eli.sloutskin@biu.ac.il), listing their preferred time.

 

 

תאריך עדכון אחרון : 17/06/2015