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Water-soluble polymer-induced drag reduction and flow patterns for oil–water flows in return bend
Colloid and Polymer Science ( IF 2.4 ) Pub Date : 2021-07-29 , DOI: 10.1007/s00396-021-04851-4
Paul Onubi Ayegba 1, 2 , Lawrence C. Edomwonyi-Otu 2, 3 , Abdulkareem Abubakar 2 , Nurudeen Yusuf 4
Affiliation  

Drag reduction (DR) by additives in single- and two-phase fluid transport has enormous engineering and economic benefits. An ample amount of work has been done with regards to understanding the mechanism of DR for developed flows in straight conduits. There is however a limited understanding of the effects of drag-reducing agents (DRAs) on under-developed flows in bends and more so for liquid–liquid two-phase flows in and around the bend. This study therefore investigates the influence of U-bend on polymer drag reduction and flow patterns for oil–water two-phase flows. The ranges for oil and water superficial velocities tested were \(0.04\le {U}_{so}\le 0.950 {m}/{s}\) and \(0.13\le {U}_{sw}\le 1.10 {m}/{s}\), respectively. The test section consists of \(19-{mm}\) ID clear polyvinyl chloride straight tubes and return bend (\(R=100 {mm}\)). Measurements were carried out for developed flow upstream of the bend, at the U-bend and at two under-developed flow sub-sections downstream of the bend. The addition of polymer imposed partial or complete flow stratification in all test sections. In all test sections, drag reduction increased with flow rate of water and reduced with oil fraction in the region of strong turbulence. For high mixture velocities, DR upstream of the bend was highest while the least was recorded at the bend. The highest DR upstream of the bend, in the U-bend and at the two downstream under-developed flow sub-sections were 40%, 34%, 28%, and 29%, respectively.



中文翻译:

水溶性聚合物诱导的减阻和回流弯油水流的流动模式

添加剂在单相和两相流体输送中的减阻 (DR) 具有巨大的工程和经济效益。在理解直管中发达流动的 DR 机制方面已经做了大量工作。然而,对于减阻剂 (DRA) 对弯道中不发达流动的影响,以及对弯道内和周围的液-液两相流的影响,了解有限。因此,本研究调查了 U 形弯曲对聚合物减阻和油水两相流流动模式的影响。测试的油和水表观速度范围为\(0.04\le {U}_{so}\le 0.950 {m}/{s}\)\(0.13\le {U}_{sw}\le 1.10 {m}/{s}\),分别。测试部分包含\(19-{mm}\)ID 透明聚氯乙烯直管和回弯 ( \(R=100 {mm}\) )。对弯管上游、U 型弯管和弯管下游的两个欠发展流子部分的发展流进行了测量。聚合物的加入在所有测试部分造成部分或完全的流动分层。在所有试验段中,在强湍流区域,减阻率随水流率增加而随油分率增加而减少。对于高混合速度,弯道上游的 DR 最高,而弯道处记录的 DR 最低。弯道上游、U 型弯和下游两个欠发达流段的最高 DR 分别为 40%、34%、28% 和 29%。

更新日期:2021-07-29
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