| Gas-liquid Cylindrical Cyclone(GLCC),due to its short residence time,high separation efficiency,large processing capacity,small footprint,low cost,strong pressure-bearing capacity and other advantages,is more adaptable to the harsh conditions underwater,and has been widely used in the field of deep sea oil and gas development.In this paper,the effect of wall wettability conditions on GLCC separation performance is presented.The effects of the four wettability characteristics of superhydrophilic,hydrophilic,hydrophobic and superhydrophobic on the flow pattern,separation efficiency and LCO starting point of the GLCC were analyzed by designing and constructing the GLCC device and using four different wettability coatings to change the wettability of the wall surface in the upper space of the GLCC.(1)Under different wall wettability conditions,the flow pattern distribution pattern is similar.As the gas-liquid volume increases,three types of flow are presented:swirling flow,churn flow,and full churn flow.(2)The study of the LCO start point showed that increasing wall hydrophobicity can increase the LCO start point and expand the GLCC safe operating area.(3)GLCC separation efficiency study shows that hydrophobic wall surface under churn flow can improve the liquid phase separation efficiency,while the hydrophilic wall surface under full mixing flow is more efficient for liquid separation.(4)A mathematical model for predicting the separation efficiency of GLCC was established,comparing the theoretical value with the experimental value,and the relative error is less than 1.5%,which has some guiding significance for industrial practice. |
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