Abstract
With the excellent heat and mass transfer performance, the annular flow has been widely employed in industries. The study on the flow characteristics distribution of annular flow is the basis for revealing the flow mechanism and improving the performance. In this paper, based on the non-invasive planar laser-induced fluorescence technology, the circumferential characteristics of liquid film in horizontal annular flow and wavy flow are investigated. The circumferential film thickness and entrainment concentration are measured by the image processing. The spatial–temporal flow structure is reconstructed, and the cross-correlation analysis is conducted. The results show that the liquid entrainment and deposition phenomena contribute to the liquid film formation near the top of the pipe. In addition, a model which predicts the circumferential film thickness according to Froude number and circumferential angle is established.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China [61671321, 61828106, and 62071325].
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Xue, T., Zhang, T., Li, C. et al. Investigation on circumferential characteristics distribution in wavy-annular flow transition based on PLIF. Exp Fluids 63, 48 (2022). https://doi.org/10.1007/s00348-022-03393-x
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DOI: https://doi.org/10.1007/s00348-022-03393-x