Bagalkot Nikhil, Hamouda Aly A, Isdahl Ole Morten
Department of Energy and Petroleum Engineering, University of Stavanger, Norway.
MethodsX. 2018 Jun 23;5:676-683. doi: 10.1016/j.mex.2018.06.012. eCollection 2018.
The current method describes a simple modification to the dynamic and equilibrium interfacial tension (IFT) measurement in a multiphase system (gas-liquid/liquid-liquid) by the Axisymmetric Drop Shape Analysis (ADSA) pendant drop technique. The primary difficulty associated with dynamic IFT measurement by ADSA is providing the appropriate phase densities, especially in a system consisting of gas (CO, methane, and propane) and liquids (water and hydrocarbon). The density of the phases is calculated using a, considering the solubility og gases in liquids, as a function of time. The calculated densities of the phases are then used as inputs in the experiment to measure the IFT at high pressure and temperature PVT-cell. The method offers benefit such as: •Straightforward and cost effective as it does not require additional experimental setup (like density meter) or a complicated equation of state.•The composition of the binary mixtures (mole and mass) and the density changes of the binary mixture due to mass transfer may be obtained as a function of time at fixed pressure and temperature.•IFT as a function of time is measured by taking into consideration of correct phase density.
当前方法描述了一种对多相系统（气-液/液-液）中通过轴对称滴形分析（ADSA）悬滴技术进行动态和平衡界面张力（IFT）测量的简单改进。通过ADSA进行动态IFT测量的主要困难在于提供合适的相密度，特别是在由气体（一氧化碳、甲烷和丙烷）和液体（水和碳氢化合物）组成的系统中。相密度是通过考虑气体在液体中的溶解度，作为时间的函数，利用一个公式计算得出的。然后，计算得到的相密度作为实验输入，用于在高压和高温PVT容器中测量IFT。该方法具有以下优点：•简单且成本效益高，因为它不需要额外的实验装置（如密度计）或复杂的状态方程。•在固定压力和温度下，二元混合物的组成（摩尔和质量）以及由于传质导致的二元混合物密度变化可以作为时间的函数获得。•通过考虑正确的相密度来测量IFT随时间的变化。
