In-situ rheological and structural characterization of milk foams in a commercial foaming device

Völp, Annika R.; Kagerbauer, Lisa; Engmann, Jan; Gunes, Deniz Z.; Gehin-Delval, Cécile; Willenbacher, Norbert

doi:10.1016/j.jfoodeng.2020.110150

Cited by 12 publications

(3 citation statements)

References 18 publications

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“…16 and 20, except for the reconstituted whole milk foams, which were produced in a commercial milk whipper (Aeroccino4, Nespresso), as described in. 17 Recording of foam age was started once the filter funnel was completely filled with foam and the nitrogen flow was stopped or the whipper stopped the foaming process. The ratios between foam and solution conductivity during free drainage of the foams were measured at the center of the foam column using a rod-shaped electrode with 5 mm measuring gap width connected to a conductivity meter (Inlab731 and SevenCompact S230, Mettler Toledo).…”

Section: Foam Preparation and Characterizationmentioning

confidence: 99%

“…The foam yield stress was either measured with the same plate-plate setup or with a four bladed vane rotor (36 mm diameter, 9 mm height) submerged into the foaming apparatus as described in ref. 17. The shear stress was increased in 12 steps between 0.1 Pa and 100 Pa and the deformation was recorded during a total measuring time of 60 s. The yield stress t y was determined from logarithmically plotted deformation versus shear stress data using the tangent intersection method.…”

Section: Foam Preparation and Characterizationmentioning

confidence: 99%

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Shear modulus and yield stress of foams: contribution of interfacial elasticity

Völp

Willenbacher

2021

Soft Matter

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Section: Foam Preparation and Characterizationmentioning

confidence: 99%

Section: Foam Preparation and Characterizationmentioning

confidence: 99%

Shear modulus and yield stress of foams: contribution of interfacial elasticity

Völp

Willenbacher

2021

Soft Matter

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“…As well as being familiar in everyday life [2][3][4][5] and useful in myriad industrial processes [6][7][8][9][10][11][12], foams have long held a fascination for physicists. The reason for 2022 The Authors.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a model for surfactant transport around a foam meniscus

Grassia

2022

Proc. R. Soc. A.

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A model developed by Bussonnière & Cantat [ 1 ] is considered for film-to-film surfactant transport around a meniscus within a foam, with the transport rate dependent upon film-to-film tension difference. The model is applied to the case of a five-film device, in which motors are used to compress two peripheral films on one side of a central film and to stretch another two peripheral films on the central film’s other side. Moreover, it is considered that large amounts of compression or stretch are imposed on peripheral films, and also that compression or stretch might be imposed at high velocities (relative to a characteristic velocity associated with physico-chemical properties of the foam films themselves). The actual strain that results on elements within each film might differ from the imposed strain, with the instantaneous film length coupled to the actual strain determining the amount of surfactant currently on each film (and hence also the amount of surfactant that has transferred either from or onto films). Quite distinct surfactant transport behaviour is predicted for the stretched film compared with the compressed one. In particular, when a film is stretched sufficiently at high enough velocity, surfactant flux onto it is predicted to become extremely ‘plastic’, increasing significantly.

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