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Deformation Rupture and Coalescence Micro-Characteristics of Drops in Sinusoidal AC Field

Author: YeTuanJie
Tutor: HeLiMin；LuoXiaoMing
School: China University of Petroleum
Course: Oil and Gas Storage and Transportation Engineering
Keywords: AC electric field drops deformation rupture coalescence drop chains
CLC: TE868
Type: Master's thesis
Year: 2010
Downloads: 73
Quote: 1
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Abstract


Electrostatic coalescence has the advantages of increasing separation efficiency, reducing footprint, decreasing energy consumption, etc. Therefore, it can provide a good solution for dehydration of high water-cut crude oil and offshore production platform. However, electrostatic coalescence is influenced by many and complex factors and needs further study. This paper carries out experiment to study the deformation, movement, rupture of single drop and coalescence characteristics of pairs of drops in sinusoidal alternating current (AC) electric field with frequency range from 50 to 400Hz. Combining with theories, it deeply analyzes how the electric field strength and frequency, oil viscosity, interfacial tension influence drops’characteristics of deformation, rupture and coalescence characteristics. It draws major conclusions as following:At the range of all factors, the higher the field frequency, the higher the oil viscosity and the smaller the interfacial tension, the lower the extension deformation range of single drop. Ellipsoid drops’eccentricity is approximately proportionate to electric field strength to the power of N ( 1.7 <N <2.4) and the its diameter. The drop with lower interfacial tension is more prone to deform in the electric field. Insulating layer’s impact on eccentricity of drops results from its increasing the oil inner effective electric field strength. In smaller deformation degree, the eccentricity is in better accordance with We number; however, when the deformation degree is larger, they will separate with each other apparently.Only in or near the critical electric field, micro-drops jetting will occur, and if the electric field strength is too high, drops will burst. The initial jetting angle of drops is about 38±2°. With the increasing of frequency and oil viscosity, as well as lower interfacial tension, the sub-drops out of mother drop will be smaller and distribute in a smaller angle, more intensively. The critical electric field strength of breakdown is proportional to (1/d d)1/2and the drop with lower interfacial tension has lower critical electric field strength. The critical eccentricity before breakdown changes at about the range from 0.810 to 0.865.Drops’coalescence has field range, above which drops won’t coalesce but rupture. Stable cone-sides will occur in appropriate electric field. Whenαis below 55°drops’coalescence is always observed. In close distance conditions (d/r2 <0.37) andα> 55°drops rotate to a certain angle and then coalesce, and the biggest attracting and coalescing angle observed is about 74.5°and 68.5°respectively. Only whenαin the vicinity of 90°, drops will repel each other obviously. In AC electric field there is almost non-occurrence of coalescence on drop chains. The field with higher frequencies seemingly generates more stable chains. Sudden reduction of electric field strength may destroy drop chains to some extent as well as turbulence disturbance. Meantime, the former may improve coalescence to some degree.

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CLC: > Industrial Technology > Oil and gas industry > Oil, natural gas storage and transportation > Mine oil and gas gathering and processing > Oil and gas pretreatment
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