This study investigates the bubble behavior in the lower part of the gas–liquid cylindrical cyclone experimentally and numerically. Malvern RTsizer and electrical resistance tomography were used to determine bubble size distribution and void fraction distribution, respectively. A discrete phase model was used to simulate the swirling flow field characteristics. The results indicated that as the gas flow rate increased, the small and medium-sized bubbles initially broke up and subsequently coalesced, whereas as the liquid flow rate increased, they only tended to break up. The gas core narrowed as the gas and liquid flow rates increased. The optimal gas–liquid separation performance was achieved when the liquid level was near 0.82 m. The separation mechanism of bubbles was analyzed via experimental observations and the simulated flow field distribution. An effective mechanism model based on bubble migration analysis was developed to predict the critical diameter of bubbles that can be separated.

中文翻译：

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气液圆柱旋流器中气液旋流下气泡的破裂，聚结和迁移规律

本研究通过实验和数值研究了气液圆柱旋风分离器下部的气泡行为。使用Malvern RTsizer和电阻层析成像分别确定气泡尺寸分布和空隙率分布。使用离散相模型来模拟旋流场特性。结果表明，随着气体流量的增加，中小气泡首先破裂并随后聚结，而随着液体流量的增加，它们只会趋于破裂。随着气体和液体流速的增加，气芯变窄。当液位接近0.82 m时，可获得最佳的气液分离性能。通过实验观察和模拟的流场分布分析了气泡的分离机理。建立了基于气泡迁移分析的有效机理模型，以预测可以分离的气泡的临界直径。