Influence of orifice type and wetting properties on bubble formation at bubble column reactors

Huber, M.; Dobesch, D.; Kunz, P.; Hirschler, Manuel; Nieken, Ulrich

doi:10.1016/j.ces.2016.06.002

Cited by 18 publications

(4 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Bubble formation in liquids depends on the density and the viscosity of both the gas-and liquid phases as well as on the interfacial tension. [17] Ideally,w ew ant the gas bubbles to be as small as possible.D ecreasing the nozzle size gives smaller bubbles,b ut also increases the Laplace pressure [Eq. (1)].T his pressure builds up until a" train" of small bubbles escapes the nozzle.T he trade-off between pressure and bubble size forced us to find an optimum size where the bubbles are basically just large enough to escape from the nozzle one by one.C hoosing the right solvent is important.…”

Section: Asimpleand Efficient Device and Methods For Measuringthe Kinementioning

confidence: 99%

See 1 more Smart Citation

A Simple and Efficient Device and Method for Measuring the Kinetics of Gas‐Producing Reactions

2019

View full text Add to dashboard Cite

We present a new device for quantifying gases or gas mixtures based on the simple principle of bubble counting. With this device, we can follow reaction kinetics down to volume step sizes of 8–12 μL. This enables the accurate determination of both time and size of these gas quanta, giving a very detailed kinetic analysis. We demonstrate this method and device using ammonia borane hydrolysis as a model reaction, obtaining Arrhenius plots with over 300 data points from a single experiment. Our device not only saves time and avoids frustration, but also offers more insight into reaction kinetics and mechanistic studies. Moreover, its simplicity and low cost open opportunities for many lab applications.

show abstract

Section: Asimpleand Efficient Device and Methods For Measuringthe Kinementioning

confidence: 99%

“…Bubble formation in liquids depends on the density and the viscosity of both the gas‐ and liquid phases as well as on the interfacial tension . Ideally, we want the gas bubbles to be as small as possible.…”

Section: Figurementioning

confidence: 99%

A Simple and Efficient Device and Method for Measuring the Kinetics of Gas‐Producing Reactions

2019

View full text Add to dashboard Cite

show abstract

“…In the many simulation studies of the reactor mentioned above, the focus is on the macroscopic flow field changes, and there is no in-depth exploration of the core factor bubbles, which causes the flow field changes. As the basic unit in the transmission process, the motion characteristics of bubbles have an important effect on material mixing and heat exchange [14][15][16][17][18] ; therefore, it is necessary to study the motion mechanism of bubbles during the research process. Zhan et al 19 proposed in the simulation of an immersion side-blown decarbonization furnace that the influence of bubble generation on the dynamic characteristics in the molten pool should be considered.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of bubble formation behavior in oxygen coal combustion melting and separating furnace

Kong

Zhao

Zhang

et al. 2020

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

In order to improve the mass transfer efficiency of the high‐temperature molten pool area in the oxygen coal combustion melting and separating furnace, water model experiment and VOF model were used to study the mechanism of bubble formation in the area, investigate the changing rules of oxygen lance parameters on the shape and frequency of bubbles. The results show that the basic law of bubble generation is the transition from lateral injection to longitudinal growth, and the bubble generation frequency is 7.5 Hz under standard conditions. Increasing the oxygen lance mass flow will reduce the generation frequency, but the local bubble distribution is more compact. Increasing the oxygen lance inclination angle increase the generation frequency, but it will cause local gas phase accumulation, if too close to the bottom of the furnace. Small oxygen lances diameter is beneficial to increase the generation frequency and enhance mass transfer efficiency. Increasing the oxygen lance immersion depth is conducive to increasing the generation frequency, the gas‐liquid interface and improving molten and separation efficiency. On the other hand, it will weaken the effect of “adherence to the wall” and reduce the erosion of furnace lining by inhibiting the flow of bubbles and slag.

show abstract

“…Wetting phenomena are of great importance to numerous engineering applications like ink penetration into paper (Aslannejad et al 2016), water transport in gas diffusion layers of a fuel cell (Hao and Cheng 2010) or bubble formation processes in a bubble column reactor (Huber et al 2016a). Numerical modeling of these processes at the microscale is essential for understanding and predicting two-phase flow applications.…”

Section: Introductionmentioning

confidence: 99%

A Two-Phase SPH Model for Dynamic Contact Angles Including Fluid–Solid Interactions at the Contact Line

2018

Self Cite

View full text Add to dashboard Cite

The description of wetting phenomena on the continuum scale is a challenging problem, since intermolecular interactions, like van der Waals forces between liquid and solid, alter the flow field at the contact line. Recently, these effects were included in the smoothed particle hydrodynamics method by introducing a contact line force (CLF) on the continuum scale. This physically based contact line force model is employed here to simulate two-phase flow in a wide range of wetting dynamics parametrized by capillary number. In particular, dynamic contact angles at various capillary number values are calculated by CLF model and compared to measured values. We find that there is significant disagreement between simulated and measured results, specially at low wetting speeds. It is indeed expected that most of the driving force is dissipated to overcome strong liquid-solid interactions, which are not adequately accounted for in the existing CLF model. Therefore, we have extended that model to account for stick-slip (SSL) behavior of the contact line caused by solid-fluid interactions. The new SSL model results in dynamic contact angle values that are in good agreement with experimental data for the full range of wetting dynamics. Keywords Dynamic contact angle • Contact line force • Two-phase flow • Stick-slip behavior • Smoothed particle hydrodynamics (SPH) List of symbols A Arbitrary field variable B Transition function for continuous surface force at solid boundary c Color function B P. Kunz

show abstract

Influence of orifice type and wetting properties on bubble formation at bubble column reactors

Cited by 18 publications

References 39 publications

A Simple and Efficient Device and Method for Measuring the Kinetics of Gas‐Producing Reactions

A Simple and Efficient Device and Method for Measuring the Kinetics of Gas‐Producing Reactions

Numerical simulation of bubble formation behavior in oxygen coal combustion melting and separating furnace

A Two-Phase SPH Model for Dynamic Contact Angles Including Fluid–Solid Interactions at the Contact Line

Contact Info

Product

Resources

About