Stability Analysis of Pure Oil-Water Emulsion in Gravity-Based Separators1

被引:0
作者
Alanazi, K. [1 ]
Mohan, R. [1 ]
Kolla, S. S. [2 ]
Shoham, O. [3 ]
机构
[1] Univ Tulsa, Dept Mech Engn, 800 South Tucker Dr, Tulsa, OK 74104 USA
[2] Oklahoma State Univ, Sch Mat Sci & Engn, 526 North Elgin Ave, Tulsa, OK 74106 USA
[3] Univ Tulsa, McDougall Sch Petr Engn, 800 South Tucker Dr, Tulsa, OK 74104 USA
来源
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME | 2025年 / 147卷 / 01期
关键词
INTERFACIAL-TENSION; TEMPERATURE-DEPENDENCE; COALESCENCE PROFILES; SEPARATION; SEDIMENTATION; SURFACTANTS;
D O I
10.1115/1.4065807
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The purpose of this work is to investigate the stability of pure (emulsifier-free) oil-water emulsion in a gravity-based separator as a function of various parameters such as mixing speed, water volume concentration, temperature, and appearance. Only simple fluids (Exxsol (TM) D110 and distilled water) were used to form the dispersion in a separator of operational volume 200 ml and internal diameter of 60 mm. Data were gathered from a portable dispersion characterization rig where videos of liquid phase separation can be saved and scanned. The study considered a wide range of mixing speeds between 600 rpm and 2500 rpm, with elevated temperatures of 60 degrees C and 80 degrees C. Both types (oil-in-water (O/W) and water-in-oil (W/O)) of pure emulsion were studied. In addition, two volumetric water concentrations (WCs) were considered for each type to investigate its stability under the parameters tested (i.e., 25% and 50% WC for W/O emulsion and 75% and 90% WC for O/W emulsion). The stability of the emulsion was examined in terms of the separation profiles of the water and oil phase, oil/water mixture volume, initiation time of free phase separation and/or the final time of separation. Mixing speed was shown to drastically impact the stability of O/W emulsion, from a few minutes to over 4 h. Conversely, insignificant effects of mixing speed were seen for W/O emulsion as the emulsions overall separated in a few seconds. Although temperature accelerated the oil separation rates of 75% WC emulsions, it delayed the initiation time of water separation.
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页数:12
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