Visualization of flow in froth

Froth is formed and transplanted on top of dye-containing solution to trace liquid flow. Sufficiently stable froth was formed with soap but with frothers (1-pentanol and polypropylene glycol) talc was necessary to produce transportable froth. With the soap froth liquid penetration was faster than for the talc-stabilized froth.

Example images showing penetration of dye into froth as function of time in minutes.Figure optionsDownload as PowerPoint slideHighlights
► Experimental setup allows flow of water into froth to be visualized.
► Talc was needed to stabilize frother-based froth.
► Rate of inflow was higher for soap froth than talc-stabilized froth.