Koller TM, Kerscher M, Fröba AP (2022)
Publication Language: English
Publication Type: Journal article, Original article
Publication year: 2022
Book Volume: 626
Pages Range: 899-915
DOI: 10.1016/j.jcis.2022.06.129
Hypothesis: Near the critical damping of surface fluctuations, surface light scattering (SLS) signals are affected by the rotational flow in the bulk of the fluid. The adequate consideration of this bulk shear mode is essential for a reliable determination of viscosity and surface tension, yet not fully resolved so far. Experiments: To elucidate the influence of the bulk shear mode on the recorded correlation functions related to surface fluctuations with an oscillatory behavior, different evaluation procedures are compared. A new evaluation approach is suggested, which makes use of the entire signal information and represents the contribution of the bulk shear mode to the signal in a convenient and physically meaningful way. This allows to unambiguously access the dynamics of the probed surface fluctuations, i.e. their mean lifetime and frequency as well as their response to the rotational flow in the bulk of the fluid. Findings: By applying the evaluation approach to SLS signals for eight different vapor–liquid systems corresponding to reduced capillary numbers between about 0.4 and 15, it is demonstrated that the developed strategy allows for an accurate determination of viscosity and surface tension. This strategy facilitates the thermophysical property research on fluids by SLS experiments performed close to the critical damping.
APA:
Koller, T.M., Kerscher, M., & Fröba, A.P. (2022). Accurate determination of viscosity and surface tension by surface light scattering in the presence of a contribution from the rotational flow in the bulk of the fluid. Journal of Colloid and Interface Science, 626, 899-915. https://dx.doi.org/10.1016/j.jcis.2022.06.129
MLA:
Koller, Thomas Manfred, Manuel Kerscher, and Andreas Paul Fröba. "Accurate determination of viscosity and surface tension by surface light scattering in the presence of a contribution from the rotational flow in the bulk of the fluid." Journal of Colloid and Interface Science 626 (2022): 899-915.
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