Using sound to study bubble coalescence

Kracht, W.; Finch, JA

Abstract

Frothers are surfactants used in flotation to aid generation of small bubbles, an effect attributed to coalescence prevention. Studying coalescence at the moment of bubble creation is a challenge because events occur over a time frame of milliseconds. This communication introduces a novel acoustic technique to study coalescence as bubbles are generated at a capillary. The sound signal was linked to bubble formation and coalescence events using high-speed cinematography. The technique has the resolution to detect events that occur within 1-2 ms. The results show that for common flotation frothers and n-alcohols (C4-C8) coalescence prevention is not simply related to surface activity. A total stress model is used to give a qualitative explanation to the action observed. Results for salt (sodium chloride) are included for comparison. © 2008.

Más información

Título según WOS: Using sound to study bubble coalescence
Título según SCOPUS: Using sound to study bubble coalescence
Título de la Revista: JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volumen: 332
Número: 1
Editorial: ACADEMIC PRESS INC ELSEVIER SCIENCE
Fecha de publicación: 2009
Página de inicio: 237
Página final: 245
Idioma: English
URL: http://linkinghub.elsevier.com/retrieve/pii/S002197970801655X
DOI:

10.1016/j.jcis.2008.12.025

Notas: ISI, SCOPUS