Volume 40 Issue 3
May  2020
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YUE Shuwen, DU Wangfang, LI Kai, ZHAO Jianfu. Gravity Independence Analysis Based on Bubble Departure in Flow Boiling[J]. Journal of Space Science, 2020, 40(3): 376-381. doi: 10.11728/cjss2020.03.376
Citation: YUE Shuwen, DU Wangfang, LI Kai, ZHAO Jianfu. Gravity Independence Analysis Based on Bubble Departure in Flow Boiling[J]. Journal of Space Science, 2020, 40(3): 376-381. doi: 10.11728/cjss2020.03.376

Gravity Independence Analysis Based on Bubble Departure in Flow Boiling

doi: 10.11728/cjss2020.03.376
  • Received Date: 2020-04-15
  • Rev Recd Date: 2020-04-22
  • Publish Date: 2020-05-15
  • The density difference between gas and liquid phases in the flow boiling phenomenon leads to the important influence of gravity on the flow and heat transfer performance. Therefore, the study of gravity effect is of great significance for the space application of flow boiling. The Bower-Klausner-Sathyanarayan gravity independent criterion, i.e. BKS criterion, is revisited. It is pointed out that BKS criterion has congenital defect in theory and cannot reflect the gravity effect correctly. Using the same departure model of growing vapor bubble in flow boiling as adopted in BKS criterion, but neglecting the sliding effect of bubble along the heating wall, the departure diameters of single bubble in the initial segment after the boiling incipience under different flow directions in normal gravity are calculated. A new gravity independent criterion based on Froude number is concluded, which is in better agreement with the experimental results. The new criterion is in principle consistent with the dominant force criterion.

     

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