Detailed study of single bubble behavior and drag correlations in Newtonian and non-Newtonian liquids for the design of bubble columns

Mahmoudi, Sadra; Hemmatian, Farshid; Dahkaee, Kaveh Padasht; Hlawitschka, Mario; Kantzas, Apostolos

doi:10.1016/j.cherd.2022.01.013

Cited by 7 publications

(1 citation statement)

References 29 publications

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“…The behavior of bubbles in non-Newtonian fluids is very different from that in Newtonian fluids. Sadra et al [21] explored the correlation between the final velocity and resistance in dilatant, Newtonian and pseudoplastic fluids in a classical bubble size range of 2-6 mm. The results show that 2 mm and 4 mm bubbles do not show shape changes and reach the final velocity in all types of liquids.…”

Section: Introductionmentioning

confidence: 99%

Study on Phase Change Flow and Heat Transfer Characteristics of Microalgae Slurry in the Absorber Tube of a Parabolic trough Solar Collector

Han,

Dong,

Chen

2023

Processes

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The study of gas–liquid two-phase flow and heat transfer in non-Newtonian fluids is of great significance for the research and development of refrigeration and energy storage. In this paper, the characteristics and influencing factors of the phase change reaction in microalgae slurry were studied by numerical simulation and experimental verification. In order to further study the rheological and heat transfer characteristics of gas–liquid two-phase flow in the collector, the effects of wall heat flux, inlet velocity and microalgae slurry concentration on the phase change reaction in microalgae slurry were studied. The results show that when the boundary conditions of microalgae slurry with the same concentration change, the phase transition of microalgae slurry is different. The higher the wall heat flux, the more forward the phase transition occurs, and the smaller the flow rate, the more forward the phase transition occurs. When the boundary conditions remain unchanged, the phase transition point of microalgae slurry with different concentrations is the same, and the concentration of microalgae slurry will not be affected. However, the deviation between the fluid temperature and the thermal conductivity of high-concentration fluid after phase change is larger than that of low-concentration fluids. The deviation in the fluid temperature reaches approximately 10 K, and the deviation in thermal conductivity reaches approximately 0.025 W/(m·K). Therefore, the change in the fluid temperature and heat transfer intensity after phase change in microalgae slurry is more intense than that of Newtonian fluids.

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Section: Introductionmentioning

confidence: 99%

Study on Phase Change Flow and Heat Transfer Characteristics of Microalgae Slurry in the Absorber Tube of a Parabolic trough Solar Collector

Han,

Dong,

Chen

2023

Processes

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Bubble dynamics under the influence of the Marangoni force induced by a stratified field of contamination

Mahmoudi,

Saeedipour,

Hlawitschka

2024

Exp. Comput. Multiph. Flow

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The Marangoni effect assumes significance in bubbly flows when temperature or concentration gradients exist in the domain. This study investigated the hydrodynamics of single bubbles under the influence of the Marangoni force induced by stratified fields of dissolved sugar, providing a numerical framework for examining these phenomena. A laboratory-scale bubble column and high-speed imaging were utilized to analyze the bubble behavior. The OpenFOAM-based geometric volume of the fluid solver was extended by incorporating the solutocapillary Marangoni effect, and a passive scalar transport equation for the sugar concentration was solved. The results revealed that small bubbles entering regions with elevated sugar concentrations experienced deceleration, transitioning into linear paths, while those departing from regions with high sugar concentrations exhibited fluctuations and meandering. Furthermore, the concentration gradient leads larger bubbles to meander throughout the entire column, without a notable increase in their velocity. The intensity of these behaviors is governed by the magnitude of the Marangoni force. The findings provide a better understanding of single bubble hydrodynamics in complex environments.

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A Dimensional optimization study on cyclone performance under the oscillating boundary condition

Nejad

Abadi

2023

Chemical Engineering and Processing - Process Intensification

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Detailed study of single bubble behavior and drag correlations in Newtonian and non-Newtonian liquids for the design of bubble columns

Cited by 7 publications

References 29 publications

Study on Phase Change Flow and Heat Transfer Characteristics of Microalgae Slurry in the Absorber Tube of a Parabolic trough Solar Collector

Study on Phase Change Flow and Heat Transfer Characteristics of Microalgae Slurry in the Absorber Tube of a Parabolic trough Solar Collector

Bubble dynamics under the influence of the Marangoni force induced by a stratified field of contamination

A Dimensional optimization study on cyclone performance under the oscillating boundary condition

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