虹吸管内空隙率对流动连续性影响的实验研究

H. Majeed, Ting Wang, J. V. D’Amico
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摘要

虹吸管是一种Ƞ-shaped导管,用于通过重力将液体从较高的高度转移到较低的高度。当需要在没有外部泵作为动力源的情况下传输液体时,它具有应用。所有虹吸应用都需要初始引注,然后是自然虹吸过程,以继续液体流动而不中断。然而,当流体处于饱和状态或含有大量溶解气体时,吸入过程将产生大量的气体或蒸汽气泡,最终可能破坏自然虹吸过程。本研究的动机是通过研究在自然虹吸中断之前可以悬浮在液体流动中的气体/蒸汽气泡的临界空隙分数(CVF)来防止虹吸过程的不连续。体积法和重量法用于确定液体虹吸管内的气泡量,然后才中断流动。实验结果表明,在流动中断前,天然虹吸管可承受高达65%的空隙率。在虹吸管上进行了一系列定性实验,以提出使停滞的虹吸管恢复活力(或重新启动)的方法。这项研究的结果将有助于确定在许多与两相流输送相关的应用中维持自然虹吸状态所必需的两相流的操作特性。利用本研究获得的定量数据了解物理特性,有助于降低泵送功率,降低两相流输运的能耗。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
EXPERIMENTAL STUDY OF VOID FRACTION EFFECT ON FLOW CONTINUITY IN A SIPHON
A siphon is a Ƞ-shaped conduit employed to transfer liquid from a higher elevation to a lower elevation via gravity. It has application when the liquid is required to be transferred without an external pump as a power source. All siphon applications require initial priming, followed by a natural siphoning process to continue the liquid flow without interruption. However, when the fluid is at the saturated condition or contains an abundance of dissolved gases, the suction process will produce a large amount of gas or vapor bubbles that may eventually disrupt the natural siphoning process. The motivation for this study is to prevent the discontinuity of the siphoning process by investigating the critical void fraction (CVF) of gas/vapor bubbles that can suspend in the liquid flow before the natural siphoning is interrupted. The volume and weight methods are used to determine the amount of air bubbles inside the liquid siphon before the flow is interrupted. The experimental results show that the natural siphon can sustain up to 65% of the void fraction before the flow is interrupted. A series of qualitative experiments are performed on the siphon to present means of rejuvenating (or repriming) a stalled siphon. The results from this study will help in determining the operating characteristics of two-phase flow necessary to sustain a naturally siphoned condition in many applications associated with two-phase flow transports. Understanding of the physics with the quantitative data obtained from this study can help reduce the pumping power and reduce the energy consumption of two-phase flow transports.
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