Abstract
The effects of the coalescence coefficient and bubble breakup models used in the numerical modeling of bubble behavior are investigated in this study. Simulations show that variations in the system pressure and superficial gas velocity affect the gas phase density and distribution of “gas holdup” in the form of large and small bubbles in the bubble column. In a pressurized bubble column with a high superficial gas velocity, owing to the churn turbulence in the bubble column, the pressure is the primary parameter that causes bubble breakup; however, previous studies have not sufficiently described the treatment of bubble coalescence under this condition. Therefore, in this work, gas holdup in the form of small bubbles is introduced into Luo’s coalescence coefficient to improve the bubble coalescence model. This optimized bubble coalescence model was found to improve the accuracy of bubble size prediction in a pressurized bubble column.
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