CFD simulations of the effect of inlet conditions on Taylor flow formation

Shao, Nan; Salman, W; Gavriilidis, Asterios; Angeli, Panagiota

doi:10.1016/j.ijheatfluidflow.2008.06.010

Cited by 64 publications

(48 citation statements)

References 26 publications

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“…Bubble formation in flow devices at constant physical properties is influenced by the ratio between the volumetric gas flow rate (Q G ) and the volumetric liquid flow rate (Q L ), the material of the channel, and geometrical properties. [6,8,20] Those are the determining criteria of bubble formation in the channels. In our computations, the ratio Q G : Q L = 176 was chosen.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…[5] Shao et al [6] also studied the bubble formation mechanism with a 2-µm cell and a SCAs of 0 • , 90…”

Section: For the Case >90mentioning

confidence: 99%

“…They found that increasing the gas velocity as well as contact angle, or decreasing the liquid velocity, increases the bubble size, and this was in accordance with experimental observations. [6,7] They concluded that surface tension is the dominant parameter for the flow regime and that viscosity and density had a minor effect in the case of the liquids applied.…”

Section: For the Case >90mentioning

confidence: 99%

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Influence of the contact angle on two‐phase flow in microreactors for nitrobenzene–hydrogen–stainless steel/carbon

Özkan

Hecht

Pfeifer

et al. 2010

Surface & Interface Analysis

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The contact angle of a gas-liquid-solid system plays a significant role in predicting flow patterns in microchannels for multiphase flows. The contact angle, which is a result of surface forces, is strongly influenced by the channel material. In the present study, we describe contact angle measurements and simulations of flow in a microchannel for the multiphase system hydrogen and nitrobenzene. Contact angles for nitrobenzene-hydrogen-stainless steel and nitrobenzene-hydrogen-carbon systems were measured using the sessile drop method at various pressures. Simulation of the two-phase system was performed using ANSYS FLUENT. The static contact angle is used as a boundary condition. The results from simulation of flow for a wide range of contact angles and the measured contact angles are presented. Experimental observations and simulation results agree in that the contact angle must be smaller 90• to obtain small bubbles and to increase the gas-liquid interfacial surface area.

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Section: Numerical Resultsmentioning

confidence: 99%

“…[5] Shao et al [6] also studied the bubble formation mechanism with a 2-µm cell and a SCAs of 0 • , 90…”

Section: For the Case >90mentioning

confidence: 99%

Section: For the Case >90mentioning

confidence: 99%

See 1 more Smart Citation

Influence of the contact angle on two‐phase flow in microreactors for nitrobenzene–hydrogen–stainless steel/carbon

Özkan

Hecht

Pfeifer

et al. 2010

Surface & Interface Analysis

View full text Add to dashboard Cite

show abstract

“…Xiong et al [15] found that bubble break-up occurred when the total pressure difference between gas and liquid exceeded the maximum Laplace pressure jump, and the viscous force also had an effect on the bubble formation in a co-flowing microchannel. Shao et al [16] studied the same process, but concluded that the surface tension has a strong effect, not the viscosity. Cubaud et al [17] proposed that bubble formation is the result of a competition between the pressure drops generated by gas and liquid flows, and Zhao et al [18] obtained the same conclusion at small capillary numbers by recording the pressure variations during bubble formation.…”

Section: Introductionmentioning

confidence: 99%

“…Shao et al [16] divided the formation process in a co-flowing configuration into three stages: expanding, contracting and necking, and movements of the three-phase contact line were observed during the process. The influences of nozzle diameters were found experimentally [20].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Bubble Formation of a Gas‐Liquid Flow in a T‐Junction Microchannel

Cai

Feng

2009

Chem Eng & Technol

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Bubble emergence in a gas-liquid flow in a T-junction microchannel of 100 lm diameter, operated under a squeezing regime, was simulated with the computational fluid dynamics method. In general, bubble formation in channels includes three stages: expansion, collapse and pinching off. After analyzing and comparing quantitatively the three forces of pressure, surface tension and shear stress acting on the gas thread in the whole process, their effects in the different stages were identified. The collapse stage was the most important for bubble formation and was investigated in detail. It was found that the collapse process was mostly influenced by the liquid superficial velocity, and the rate and time of collapse can be correlated with empirical equations including the liquid superficial velocity, the capillary number and the Reynolds number.

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Development of Novel Multiphase Microreactors: Recent Developments and Future Challenges

Rebrov

2019

Handbook of Green Chemistry

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Nowadays, one of the major challenges for the chemical industry is the development of innovative processes with less by‐product formation, improved product yields, and high‐energy efficiency. Microreactor technology provides unique solutions to meet these requirements. As an important means for process intensification, microchemical technology is expected to have a number of advantages for chemicals production. The high heat‐ and mass‐transfer rates in microreactors enable many highly exothermic, fast reactions to be operated under nearly isothermal conditions, thereby better selectivity or yield can be reached as compared to conventional reactors.This chapter is a summary of recent developments in microreactor technology for gas–liquid catalytic reactions that constitute up to 20% of all reactions used in fine chemicals industry. The fundamentals of design and operation of microreactors are explained. Various design concepts are discussed and key features are illustrated, and examples of successful applications are given.

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CFD simulations of the effect of inlet conditions on Taylor flow formation

Cited by 64 publications

References 26 publications

Influence of the contact angle on two‐phase flow in microreactors for nitrobenzene–hydrogen–stainless steel/carbon

Influence of the contact angle on two‐phase flow in microreactors for nitrobenzene–hydrogen–stainless steel/carbon

Numerical Study on Bubble Formation of a Gas‐Liquid Flow in a T‐Junction Microchannel

Development of Novel Multiphase Microreactors: Recent Developments and Future Challenges

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