Experimental study on the wall shear stress of slug flow under static and rolling conditions

doi:10.11949/0438-1157.20230939

Abstract

Abstract:

Wall shear stress is a key parameter in the near wall transfer process of gas-liquid two-phase flow. Based on the limit diffusion current method, the wall shear stress characteristics of gas-liquid two-phase slug flow in an upward tube under rolling condition were experimentally studied, and the radial distribution and axial evolution of the wall shear stress were obtained. The test section is 2.3 m in height, the rolling amplitude and frequency are in the ranges of 10 mm to 30 mm and 1 Hz to 2.5 Hz, respectively. The results show that the intermittent flow of Taylor bubbles and liquid plugs under slug flow causes the transient wall shear stress to have pulsating characteristics. The radial distribution of the wall shear stress under static conditions is relatively uniform and slightly increases along the flow direction. As the rolling amplitude and frequency increase, the length of Taylor bubbles tends to be shorter, resulting in decrease in the peak region of transient wall shear stress.

Key words: gas-liquid flow, gas holdup, slug flow, wall shear stress, riser

摘要：

壁面剪切力是气液两相流近壁面传递过程的关键参数。基于极限扩散电流方法实验研究了摇摆状态下上升实验段内气液两相弹状流的壁面切应力特性，获得了壁面切应力的径向分布规律和轴向演化规律。实验段的内径为50 mm，高度为2.3 m，摇摆频率为1~2.5 Hz，摇摆幅度为10~30 mm。结果表明，弹状流下Taylor气泡和液塞的间歇性流动导致瞬态壁面切应力具有脉动性特征，静态条件下壁面切应力的径向分布比较均匀，沿流动方向略有增大。随着摇摆幅度和频率的增加，Taylor气泡逐渐变短，瞬态壁面切应力的峰值区域减小。

关键词: 气液两相流, 气含率, 弹状流, 切应力, 上升管

CLC Number:

O 359.1

Nailiang LI, Jukai CHEN, Junkai HAN, Qingjie ZHAO, Yifan ZHANG. Experimental study on the wall shear stress of slug flow under static and rolling conditions[J]. CIESC Journal, 2023, 74(12): 4852-4862.

李乃良, 陈聚凯, 韩骏楷, 赵庆杰, 张一帆. 静态及摇摆条件下弹状流壁面切应力实验研究[J]. 化工学报, 2023, 74(12): 4852-4862.

Figures/Tables 10

Fig.1 Schematic diagram of experimental system

Fig.2 Experimental parameter range and distribution of concerned gas-liquid velocity

Fig.3 Wall shear stress electrode and output amplifier circuit

Fig.4 Schematic diagram of the arrangement of wall shear stress probes

Fig.5 Transient wall shear stress and liquid holdup under different gas-liquid flow rates

Fig.6 Radial distribution of wall shear stress at different test points with USL= 0.35 m/s

Fig.7 Radial distribution of wall shear stress at different test points with USG= 0.26 m/s

Fig.8 Axial distribution of wall shear stress at different test points with USL= 0.451 m/s

Fig.9 Axial distribution of wall shear stress at different test points with USG= 0.31 m/s

Fig.10 Effect of rolling on wall shear stress (USG= 0.17 m/s，USL= 0.66 m/s)

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