ABSTRACT
Gas–liquid bubbly flows are commonly encountered in many industrial processes. In
many cases, the evolution of bubble size distribution is a crucial factor governing the
momentum, heat and mass transfer between phases within the system. In this thesis,
numerical investigation of gas-liquid bubbly flows is achieved by coupling a population
balance model with the three-dimensional, two-fluid model. With the aim of evaluating
the capabilities of the population balance model, a model validation study to assess the
MUSIG model in a highly asymmetrical distributed bubbly flow in vertical pipe has been
presented. Particularly, the research focus has been centered on detailed numerical
investigation of the coalescence and breakup phenomenon by performing extensive
numerical investigations for the examination and comparison of different model
formulations. Two major contributions has been achieved in this thesis; (1) a
modification of the coalescence model of Prince and Blanch (1990) to account for the
imbalance between coalescence and breakup phenomenon; and (2) the population balance
approach with implementation of the modified model into ANSYS CFX code using CFX
Expression Language (CEL). Model predictions were validated against experimental
measurements reported by Monros et al., (2013). Three different modifications (cases)
have been investigated. Overall, predictions of the three cases were in satisfactory
agreement with the experimental data. The transition from “wall peak” to “core peak” gas
volume fraction profiles has been successfully captured. Encouraging results clearly
demonstrates the applicability of the models for large scale industrial systems. In general,
the comparison shows that the model labelled as Case 2 presented the best results in most
of the experimental conditions.
CDR, C (2021). NUMERICAL SIMULATION OF ISOTHERMAL GAS-LIQUID BUBBLY FLOW: INFLUENCE OF BUBBLE COALESCENCE AND BREAKUP. Afribary.com: Retrieved April 11, 2021, from https://afribary.com/works/numerical-simulation-of-isothermal-gas-liquid-bubbly-flow-influence-of-bubble-coalescence-and-breakup
Coalition, CDR. "NUMERICAL SIMULATION OF ISOTHERMAL GAS-LIQUID BUBBLY FLOW: INFLUENCE OF BUBBLE COALESCENCE AND BREAKUP" Afribary.com. Afribary.com, 02 Apr. 2021, https://afribary.com/works/numerical-simulation-of-isothermal-gas-liquid-bubbly-flow-influence-of-bubble-coalescence-and-breakup . Accessed 11 Apr. 2021.
Coalition, CDR. "NUMERICAL SIMULATION OF ISOTHERMAL GAS-LIQUID BUBBLY FLOW: INFLUENCE OF BUBBLE COALESCENCE AND BREAKUP". Afribary.com, Afribary.com, 02 Apr. 2021. Web. 11 Apr. 2021. < https://afribary.com/works/numerical-simulation-of-isothermal-gas-liquid-bubbly-flow-influence-of-bubble-coalescence-and-breakup >.
Coalition, CDR. "NUMERICAL SIMULATION OF ISOTHERMAL GAS-LIQUID BUBBLY FLOW: INFLUENCE OF BUBBLE COALESCENCE AND BREAKUP" Afribary.com (2021). Accessed April 11, 2021. https://afribary.com/works/numerical-simulation-of-isothermal-gas-liquid-bubbly-flow-influence-of-bubble-coalescence-and-breakup