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Experimental Study of Air-Water Two-Phase Flow Pattern Evolution in a Mini tube: Influence of Tube Orientation with Respect to Gravity
International Journal of Multiphase Flow ( IF 3.8 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.ijmultiphaseflow.2020.103413 Salim Zeguai , Salah Chikh , Lounès Tadrist
International Journal of Multiphase Flow ( IF 3.8 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.ijmultiphaseflow.2020.103413 Salim Zeguai , Salah Chikh , Lounès Tadrist
Abstract The evolution of two-phase flow patterns is investigated experimentally in a 1500 mm long capillary tube of 3 mm inner diameter with different orientations with respect to gravity. The flow patterns are recorded with a fast camera (1000 fps) at two locations along the tube under the same operating conditions. The first is close to the inlet zone at L/D = 10 and the second is far downstream at L/D = 420. Co-flowing configurations downward and upward are considered where air is injected through a nozzle of 110 μm of inner diameter and centered on the tube axis. Unlike many existing studies in the literature, the present work explores ranges of small superficial velocities of the two fluids, from 0.78 × 10−3 m/s to 79 × 10−3 m/s for the liquid phase and from 2.3 × 10−3 m/s to 3.54 m/s for the gas phase, in order to deal with smooth interfaces. The experiments show that the flow patterns are very sensitive to inlet conditions. Although, the superficial velocities considered are very small, several two-phase flow patterns are visualized namely bubbly flow, slug flow, unstable annular and annular flow. In the upward flow, the annular pattern is unstable, while for the downward flow, the bubbly pattern is difficult to obtain. Phenomena like coalescence and breakup yield to the evolution of the flow pattern from the entrance of the tube to the downstream location. The visualizations highlight also that certain flow patterns evolve from one structure to another along the tube from the location L/D = 10 to L/D = 420. Furthermore, the two-phase flow maps are drawn and the effect of gravity on the flow maps as well as on the flow pattern transitions is discussed.
中文翻译:
微型管中气水两相流型演化的实验研究:管方向相对于重力的影响
摘要 在一根 1500 毫米长、内径为 3 毫米、相对于重力方向不同的毛细管中,通过实验研究了两相流型的演变。在相同的操作条件下,在沿管的两个位置使用快速相机 (1000 fps) 记录流动模式。第一个在 L/D = 10 处靠近入口区,第二个在 L/D = 420 处位于远下游。考虑向下和向上的共流配置,其中空气通过内径为 110 μm 的喷嘴喷射,并且以管轴为中心。与文献中的许多现有研究不同,本工作探索了两种流体的小表观速度范围,液相从 0.78 × 10−3 m/s 到 79 × 10−3 m/s 和 2.3 × 10−3 m/s。气相为 3 m/s 至 3.54 m/s,为了处理流畅的界面。实验表明,流动模式对入口条件非常敏感。尽管所考虑的表观速度非常小,但可以看到几种两相流模式,即气泡流、段塞流、不稳定环流和环流。在向上流动时,环形图案不稳定,而向下流动时,气泡图案难以获得。从管的入口到下游位置的流动模式的演变,如聚结和破裂等现象。可视化还突出显示,某些流动模式沿着管子从 L/D = 10 到 L/D = 420 位置从一种结构演变为另一种结构。此外,
更新日期:2020-11-01
中文翻译:
微型管中气水两相流型演化的实验研究:管方向相对于重力的影响
摘要 在一根 1500 毫米长、内径为 3 毫米、相对于重力方向不同的毛细管中,通过实验研究了两相流型的演变。在相同的操作条件下,在沿管的两个位置使用快速相机 (1000 fps) 记录流动模式。第一个在 L/D = 10 处靠近入口区,第二个在 L/D = 420 处位于远下游。考虑向下和向上的共流配置,其中空气通过内径为 110 μm 的喷嘴喷射,并且以管轴为中心。与文献中的许多现有研究不同,本工作探索了两种流体的小表观速度范围,液相从 0.78 × 10−3 m/s 到 79 × 10−3 m/s 和 2.3 × 10−3 m/s。气相为 3 m/s 至 3.54 m/s,为了处理流畅的界面。实验表明,流动模式对入口条件非常敏感。尽管所考虑的表观速度非常小,但可以看到几种两相流模式,即气泡流、段塞流、不稳定环流和环流。在向上流动时,环形图案不稳定,而向下流动时,气泡图案难以获得。从管的入口到下游位置的流动模式的演变,如聚结和破裂等现象。可视化还突出显示,某些流动模式沿着管子从 L/D = 10 到 L/D = 420 位置从一种结构演变为另一种结构。此外,