Characteristics of entrapped bubbles of periodic condensation-induced water hammer in a horizontal pipe
Characteristics of entrapped bubbles of periodic condensation-induced water hammer in a horizontal pipe
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水平管内周期性凝结水锤截留气泡特征
DOI：
10.1016/j.ijheatmasstransfer.2020.119534
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发表时间：
2020-05
影响因子：
5.2
通讯作者：
Junjie Yan
中科院分区：
文献类型：
--
作者：
Daotong Chong;Lutao Wang;Wenbing Liu;Zhenzhen Wang;Junjie Yan
蒸汽冷凝诱发水锤（CIWH）会引起巨大的压力振荡，对管道和相关设备的了解非常重要。在水平管道中，对周期CIWH的圈闭气泡的冷凝过程及其压力振荡进行了实验研究。实验结果表明，周期式涡流涡流是由圈闭气泡凝结形成的，在一定的试验条件下，周期式涡流涡流的初始体积基本保持不变。初始气泡体积随着蒸汽质量通量和水温的升高而增大。CIWH压力振荡强度随初始气泡体积的增大而增大，随水温的升高而减小。随着被困气泡的凝结，气泡体积变化率逐渐增大。气泡体积的最终变化率随初始气泡体积的增大而增大，随水温的升高而减小。最后，提出了压力振荡强度与气泡体积最终变化率之间的理论相关性，即压力振荡强度与气泡体积最终变化率之间的线性关系，用于计算CIWH的压力振荡强度。预测偏差范围从- 44%到64%。
Steam condensation-induced water hammer (CIWH) can cause great pressure oscillation, and the knowl- edge of CIWH is important to pipes and relevant equipment. In this work, an experiment was conducted to investigate the condensation process of entrapped bubbles for periodic CIWH and its pressure oscil- lation in a horizontal pipe. Results indicated that CIWH was caused by the condensation of entrapped bubbles, and the initial volume of entrapped bubbles of the periodic CIWH kept nearly unchanged when the test conditions were constant. The initial bubble volume increased with the increases in steam mass flux and water temperature. The pressure oscillation intensity of the CIWH increased with the increase in initial bubble volume but decreased with the increase in water temperature. Furthermore, the change rate of bubble volume gradually increased with the condensation of the entrapped bubbles. The final change rate of bubble volume increased with the increase in initial bubble volume but decreased with the increase in water temperature. Finally, a theoretical correlation, that is, a linear relationship between the pressure oscillation intensity and the final change rate of bubble volume, was proposed to calculate the pressure oscillation intensity of the CIWH. The predicted deviation ranged from −44% to 64%.
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影响因子：
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作者：
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通讯作者：
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DOI：
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