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| Experimental study on the gas-liquid two-phase flow-induced vibration in a U-tube |
| MA Xiaoxu1,2，LIU Shuai1，ZHANG Zheng2，TIAN Maocheng2 |
1.School of Thermal Engineering, Shandong Jianzhu University, Jinan 250101, China;
2.School of Energy and Power Engineering, Shandong University, Jinan 250061, China |
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Abstract The dynamic response characteristic of gas-liquid two-phase flow-induced vibration in a transverse U-shaped tube was studied experimentally. The effects of flow pattern, superficial gas velocity Ug, superficial gas velocity Ul, volume void fraction β on vibration response arms were studied. The results show that the vibration response in the transverse U-tube mainly presents the flapping phenomenon in plane direction at low frequency. The amplitude of the frequency spectrum presents the approximate parabola distribution along the axial measured points of the U-shaped elbow and reaches the maximum at the 90-degree position of the elbow. The order of the arms is slug-wavy flow, annular-wavy flow, annular dispersed flow, plug-bubble flow and plug-stratified flow. For a given Ug, the arms presents a trend of approximately flat growth and then a sharp increase with the increase of Ug. The boundary of the sharp increase is about Ug = 1m/s. For a given Ug, the arms increases with the rise of Ul. For a given β, arms presents a very slow growth trend with the increasing of β. However, when β increase to a certain value, arms increases greatly with the rise of β. The certain value decreases with the increasing of superficial liquid velocity.
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Received: 27 September 2022
Published: 28 July 2023
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