A review of aqueous foam in microscale

Abstract

In recent years, significant progress has been achieved in the study of aqueous foams. Having said this, a better understanding of foam physics requires a deeper and profound study of foam elements. This paper reviews the studies in the microscale of aqueous foams. The elements of aqueous foams are interior Plateau borders, exterior Plateau borders, nodes, and films. Furthermore, these elements' contribution to the drainage of foam and hydraulic resistance are studied. The Marangoni phenomena that can happen in aqueous foams are listed as Marangoni recirculation in the transition region, Marangoni-driven flow from Plateau border towards the film in the foam fractionation process, and Marangoni flow caused by exposure of foam containing photosurfactants under UV. Then, the flow analysis of combined elements of foam such as PB-film along with Marangoni flow and PB-node are studied. Next, we contrast the behavior of foams in different conditions. These various conditions can be perturbation in the foam structure caused by injected water droplets or waves or using a non-Newtonian fluid to make the foam. Further review is about the effect of oil droplets and particles on the characteristics of foam such as drainage, stability and interfacial mobility.

Surface rheological measurements of isolated food foam systems

“…13 The already complex geometries within the foam microstructure undergo expansion and distortion, with these phenomena determined, to an extent, by the rheology of the bulk liquid and the gas-liquid interface, which themselves are dependent on the liquid flow rate. 14 In addition, the body of experimental work studying these isolated channels is extremely limited, 15 making it difficult to clearly confirm or refute theoretical predictions. When one considers that many studies of macroscopic foam systems are based on such microscale theory, it is clear that more microscale evidence is required, 16 in terms of both quantity and accuracy.…”

“…By creating spatially "ideal" arrangements of foam channels within bespoke frames, researchers have been able to probe specific physical and chemical variables that were thought to influence the nature of the interface. 15,6,7,[17][18][19][20][21] Such in situ measurements of channel surface rheology are critical, as they provide unparalleled control and measurement consistency.…”

Random Packing Performance in Continuous Foam Fractionation

“…The bubbles leave the bulk liquid phase forming the foam. The bubbles inside the foam phase rise along the vertical axis of the column, meanwhile, the interstitial liquid drains out of the foam through an intricate network comprising numerous plateau borders and nodes 12, 13. However, this network results in serious resistance for foam drainage 14.…”

Numerical and experimental study of a novel aerodynamic foam breaker for foam drilling fluid

“…The presence of foam can result in numerous troublesome issues, including the loss of target products and substrates, reduction in the equipment working volume, and environmental pollution. Control or suppression of foam formation is an essential operational task in these production processes . Even in certain situations in which foams are required, defoaming is indispensable.…”