In marine power equipment, the bubble movement will have an impact on the heat transfer characteristics of the equipment. Rolling motion is the most typical marine motion conditions. Under rolling conditions, the bubble motion under the influence of rolling force is very different from that of the bubble motion under static conditions, and the motion law becomes more complicated, which will affect the safe operation of the system in serious cases. In this study, we used the volume-of-fluid (VOF) method to investigate the effect of the change of the maximum roll angle and roll period on the rising motion of bubbles. The results show that the detachment process is unstable under the rolling condition, and the detachment diameter of the bubbles shows a decreasing trend with the increase of the tilt angle. Under the influence of the rolling action, the bubble deflection direction was the same as the rolling direction, and the lateral deflection motion was more intense with the decrease of the rolling period. As the maximum roll angle increases, the bubble produces a greater lateral offset. In addition, the degree of bubble deflection is greater as the rocking motion becomes more violent.

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Characterization of Bubble Motion in Bottom Submerged Orifice Under Rolling Conditions

  • Shuaihe Wang,
  • Mingjun Wang,
  • Wenxi Tian,
  • Suizheng Qiu,
  • Guanghui Su

摘要

In marine power equipment, the bubble movement will have an impact on the heat transfer characteristics of the equipment. Rolling motion is the most typical marine motion conditions. Under rolling conditions, the bubble motion under the influence of rolling force is very different from that of the bubble motion under static conditions, and the motion law becomes more complicated, which will affect the safe operation of the system in serious cases. In this study, we used the volume-of-fluid (VOF) method to investigate the effect of the change of the maximum roll angle and roll period on the rising motion of bubbles. The results show that the detachment process is unstable under the rolling condition, and the detachment diameter of the bubbles shows a decreasing trend with the increase of the tilt angle. Under the influence of the rolling action, the bubble deflection direction was the same as the rolling direction, and the lateral deflection motion was more intense with the decrease of the rolling period. As the maximum roll angle increases, the bubble produces a greater lateral offset. In addition, the degree of bubble deflection is greater as the rocking motion becomes more violent.