The behaviors of gas-liquid swirling flow under various swirler turns, neglected in previous studies, are essential for swirling flow applications. The role of swirler turns (1, 3, 5) in swirling flow characteristics was systematically investigated in a horizontal pipeline with an inner diameter of 32 mm. The temporal stability and circumferential symmetry of swirling liquid film become better with increasing swirler turns. The periodicity of the swirling liquid film interfacial wave induced by slug flow increases as the swirler turns decrease, while the main wave frequency decreases. Interestingly, for the original slug flow, the downstream void fraction probability density function curves are bimodal with 3 and 5 turns, while it is single-peaked at the swirler with 1 turn. The effectiveness of swirler with 1 turn, 3 turns, and 5 turns in promoting carrying liquid was 100 %, 82.08 %, and 89.22 %, respectively. The mechanism of liquid-carrying was explained in terms of perturbation waves and momentum transfer in the gas-liquid interface. Based on the homogeneous flow model and separated flow model, two predictive models for swirler pressure loss were proposed with maximum errors of 14.67 % and 17.86 %, respectively.

中文翻译：

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水平管道内气液旋流行为及携液机理

各种旋流器转数下的气液旋流行为在以前的研究中被忽略，但对于旋流应用至关重要。在内径32 mm的水平管道中系统研究了旋流器匝数（1、3、5）对旋流流动特性的影响。随着旋流器圈数的增加，旋流液膜的时间稳定性和周向对称性变得更好。随着旋流器圈数的减小，段塞流诱发的旋流液膜界面波的周期性增大，而主波频率减小。有趣的是，对于原始段塞流，下游空隙率概率密度函数曲线是 3 圈和 5 圈的双峰，而在 1 圈旋流器处是单峰。 1圈、3圈、5圈旋流器对载液的促进效率分别为100%、82.08%、89.22%。从气液界面的扰动波和动量传递的角度解释了载液机理。基于均匀流模型和分离流模型，提出了两种旋流器压力损失预测模型，最大误差分别为14.67%和17.86%。