Experimental Study on Gas–Liquid Interface Evolution during Liquid Displaced by Gas of Mobile Pipeline

Jimiao Duan, Huishu Liu, Jiali Tao, Ting’ao Shen, Weixing Hua and Jinfa Guan
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Jimiao Duan: Army Logistics Academy, Chongqing 401331, China
Huishu Liu: Army Logistics Academy, Chongqing 401331, China
Jiali Tao: Army Logistics Academy, Chongqing 401331, China
Ting’ao Shen: Army Logistics Academy, Chongqing 401331, China
Weixing Hua: Army Logistics Academy, Chongqing 401331, China
Jinfa Guan: Army Logistics Academy, Chongqing 401331, China

Energies, 2022, vol. 15, issue 7, 1-16

Abstract: The mobile pipeline is the most effective and reliable means for the emergency oil transfer task, which is temporarily laid on the field. After completing the task, the oil in the pipeline should be emptied before the mobile pipeline is removed. The oil in pipeline gradually displaced by the air is a main method of pipeline evacuation, which is the only choice of jet fuel pipeline. Due to the convection between gas and oil phases, the length of the oil–gas mixing section and the evolution of the oil–gas interface change with time. The evolution of the gas–liquid interface directly determines the different flow patterns of oil–gas two phases, which are very important for the mobile pipeline evacuation. In this paper, the characteristics of the gas–liquid interface evolution during the water displaced by air are studied, using the multi-phase pipeline experiment. Through the change of the gas–liquid interface in the initial stage of gas cap evacuation, it is found that the gas–liquid interface can be divided into smooth, wavy, and dispersed forms under different initial gas flow rates and different inclination angles. Slug phenomenon may occur in the process of gas-carrying liquid flow in the pipeline. The emergence of slug is mainly affected by hydraulic conditions and pipeline operating conditions. The liquid plug body is complex and unstable, and there will be a mutual transition between different liquid slug shapes. The increase of the inclination angle and gas phase velocity will accelerate the occurrence of liquid slug frequency.

Keywords: mobile pipeline; gas cap evacuation; gas–liquid interface evolution; gas–liquid slug flow; liquid displacement (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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