Influence of the drag coefficient of a single bubble in vertical upward turbulent bubbly flows
Apstrakt
Numerical simulations of upward turbulent bubbly flows in vertical pipes are carried
out in the Euler-Euler framework with a low-Reynolds-number (LRN) model for liquid for
various flow conditions. It is found that the correlation for the drag coefficient of a single
bubble in a shear flow, which has been successfully used in numerical simulations with
the high-Reynolds-number (HRN) models, cannot be used with the LRN model. The
reason is an excessive value of drag coefficient of a single bubble in the near-wall cells.
Therefore, a new correlation for the drag coefficient of a single bubble in shear flow has
been proposed. The results of numerical simulations are analysed and compared to
selected experiment results. It is shown that the largest effect of the application of the
new correlation for the drag coefficient of a single bubble in shear flow can be achieved
on the reduction of the relative velocity between gas and liquid. Overall, the results of
numerical simulations ...agree well with the experimental results.
Izvor:
ICAS 2022 Book of abstracts, 2022, 85-Finansiranje / projekti:
- Primena savremenih mernih i proračunskih tehnika za izučavanje strujnih parametara ventilacionih sistema na modelu energetski izuzetno efikasnog (pasivnog) objekta (RS-MESTD-Technological Development (TD or TR)-35046)
Kolekcije
Institucija/grupa
Mašinski fakultetTY - CONF AU - Raković, Milan AU - Radenković, Darko AU - Ćoćić, Aleksandar AU - Lečić, Milan PY - 2022 UR - https://machinery.mas.bg.ac.rs/handle/123456789/6219 AB - Numerical simulations of upward turbulent bubbly flows in vertical pipes are carried out in the Euler-Euler framework with a low-Reynolds-number (LRN) model for liquid for various flow conditions. It is found that the correlation for the drag coefficient of a single bubble in a shear flow, which has been successfully used in numerical simulations with the high-Reynolds-number (HRN) models, cannot be used with the LRN model. The reason is an excessive value of drag coefficient of a single bubble in the near-wall cells. Therefore, a new correlation for the drag coefficient of a single bubble in shear flow has been proposed. The results of numerical simulations are analysed and compared to selected experiment results. It is shown that the largest effect of the application of the new correlation for the drag coefficient of a single bubble in shear flow can be achieved on the reduction of the relative velocity between gas and liquid. Overall, the results of numerical simulations agree well with the experimental results. C3 - ICAS 2022 Book of abstracts T1 - Influence of the drag coefficient of a single bubble in vertical upward turbulent bubbly flows SP - 85 UR - https://hdl.handle.net/21.15107/rcub_machinery_6219 ER -
@conference{ author = "Raković, Milan and Radenković, Darko and Ćoćić, Aleksandar and Lečić, Milan", year = "2022", abstract = "Numerical simulations of upward turbulent bubbly flows in vertical pipes are carried out in the Euler-Euler framework with a low-Reynolds-number (LRN) model for liquid for various flow conditions. It is found that the correlation for the drag coefficient of a single bubble in a shear flow, which has been successfully used in numerical simulations with the high-Reynolds-number (HRN) models, cannot be used with the LRN model. The reason is an excessive value of drag coefficient of a single bubble in the near-wall cells. Therefore, a new correlation for the drag coefficient of a single bubble in shear flow has been proposed. The results of numerical simulations are analysed and compared to selected experiment results. It is shown that the largest effect of the application of the new correlation for the drag coefficient of a single bubble in shear flow can be achieved on the reduction of the relative velocity between gas and liquid. Overall, the results of numerical simulations agree well with the experimental results.", journal = "ICAS 2022 Book of abstracts", title = "Influence of the drag coefficient of a single bubble in vertical upward turbulent bubbly flows", pages = "85", url = "https://hdl.handle.net/21.15107/rcub_machinery_6219" }
Raković, M., Radenković, D., Ćoćić, A.,& Lečić, M.. (2022). Influence of the drag coefficient of a single bubble in vertical upward turbulent bubbly flows. in ICAS 2022 Book of abstracts, 85. https://hdl.handle.net/21.15107/rcub_machinery_6219
Raković M, Radenković D, Ćoćić A, Lečić M. Influence of the drag coefficient of a single bubble in vertical upward turbulent bubbly flows. in ICAS 2022 Book of abstracts. 2022;:85. https://hdl.handle.net/21.15107/rcub_machinery_6219 .
Raković, Milan, Radenković, Darko, Ćoćić, Aleksandar, Lečić, Milan, "Influence of the drag coefficient of a single bubble in vertical upward turbulent bubbly flows" in ICAS 2022 Book of abstracts (2022):85, https://hdl.handle.net/21.15107/rcub_machinery_6219 .