- 作者：F. Ravera ; G. Loglio ; P. P ; olfini ; E. Santini ; L. Liggieri
- 关键词：Capillary Pressure Tensiometry ; Surface rheology ; High frequency drop oscillation ; Measurement theory ; Interfacial tension
- 刊名：Colloids and Surfaces A: Physicochemical and Engineering Aspects
- 出版年：2010
- 出版时间：5 August 2010
- 年：2010
- 卷：365
- 期：1-3
- 页码：2-13
- 全文大小：571 K
A critical aspect of this technique concerns the calculation of the real and imaginary part of the dilational viscoelasticity from the directly acquired experimental data.
Such calculation requires a specific experiment theory accounting also for the compressibility of the closed part of the experimental cell and for the fact that the acquired pressure is a superposition of different fluid dynamic contributions.
Here we present an extension of previously proposed approaches, considering two different CPT configurations which refer to some already in use. The pressure inside the measurement cell is theoretically calculated considering the contributions, not only of the capillary pressure, but also of the Poiseuille pressure due to the fluid motion through the capillary and of hydrodynamic inertial terms.
Simulations of experimental pressure signal are calculated as a function of specific experimental parameters in order to evaluate their influence on the measurement and to improve the effectiveness of the apparatus and the experimental methodology. Moreover in order to validate the assumptions of this approach, specifically acquired experimental data are analysed.