Characteristics of Gas–Liquid Two-Phase flow in rectangular narrow slits with varying cross sections driven by large pressure drop

IF 2.8 2区 工程技术 Q2 ENGINEERING, MECHANICAL Experimental Thermal and Fluid Science Pub Date : 2024-10-05 DOI:10.1016/j.expthermflusci.2024.111328
Zhendong Yang, Haiyang Li, Haibo Liu, Suqi Shi, Jiaxiang Sun, Qiaoling Zhang, Guodong Li
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Abstract

Pressure pipelines and vessels inevitably contain some defects. Under the most unfavorable load combinations, these defects may gradually develop into through-wall cracks. High-pressure subcooled fluid leaks through these cracks, and two-phase gas–liquid flow often occurs within the cracks. In this study, natural through-wall cracks were replaced with narrow rectangular slits with varying cross sections. Experiments were conducted to investigate the variation patterns of gas–liquid two-phase leakage flow rates and pressure drops. The study focused on four types of rectangular narrow slits with varying cross sections, a width of 28 mm, a length of 80 mm, and a gap gradually ranging from 0.134 to 0.334 mm. The liquid-phase mass flow rate ranged from 150 to 700 kg/h, whereas the gas-phase mass flow rate varied from 0 to 20 kg/h. A one-dimensional homogeneous flow model was established by coupling two-phase velocity of speed calculations. This calibrated model was then used to predict pressure drops and flow parameters for gas–liquid two-phase flow in narrow rectangular slits with varying cross sections. The experimental data were analyzed to determine the two-phase leakage characteristics of different test pieces. The results show that the inlet–outlet pressure drop and flow quality are key factors affecting the two-phase leakage flow rate. The frictional pressure drop constitutes a major part of the total pressure drop along the flow path in different test pieces. Compared with the acceleration pressure drop in the expanding slit, that in the constricting slit is higher, with an increase of approximately 32 %. Among several commonly used empirical formulas for calculating two-phase viscosity, the McAdams and Dukler empirical correlations were found to be less suitable for high-velocity two-phase flows. In contrast, the Cicchitti empirical correlation provides better predictions, with a mean absolute deviation (MAD) and mean relative deviation (MRD) of no more than 8 %. The viscosity of the gas-phase medium affects the two-phase flow characteristics in narrow slits, which should be considered in practical engineering applications.
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大压降驱动下不同截面矩形窄缝中的气液两相流特性
压力管道和容器不可避免地存在一些缺陷。在最不利的负载组合下,这些缺陷可能会逐渐发展成穿壁裂缝。高压过冷流体会通过这些裂缝泄漏,裂缝内往往会出现气液两相流。在本研究中,用不同横截面的窄矩形缝隙取代了天然的穿墙裂缝。实验研究了气液两相泄漏流速和压降的变化规律。研究的重点是四种截面不同的矩形窄缝,宽度为 28 毫米,长度为 80 毫米,间隙逐渐从 0.134 毫米到 0.334 毫米不等。液相质量流量为 150 至 700 千克/小时,气相质量流量为 0 至 20 千克/小时。通过耦合两相速度计算,建立了一维均质流动模型。然后,利用该校准模型来预测不同截面的窄矩形缝隙中气液两相流的压降和流动参数。通过分析实验数据,确定了不同试件的两相泄漏特性。结果表明,入口-出口压降和流动质量是影响两相泄漏流速的关键因素。摩擦压降是不同试件流道总压降的主要部分。与膨胀狭缝中的加速压降相比,收缩狭缝中的加速压降更高,大约增加了 32%。在几种常用的计算两相粘度的经验公式中,McAdams 和 Dukler 经验相关公式不太适合高速两相流。相比之下,Cicchitti 经验相关法的预测效果更好,平均绝对偏差(MAD)和平均相对偏差(MRD)均不超过 8%。气相介质的粘度会影响窄缝中的两相流特性,在实际工程应用中应加以考虑。
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来源期刊
Experimental Thermal and Fluid Science
Experimental Thermal and Fluid Science 工程技术-工程:机械
CiteScore
6.70
自引率
3.10%
发文量
159
审稿时长
34 days
期刊介绍: Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.
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