Bubble generation in quiescent and co-flowing liquids

Chakraborty, Indrajit; Biswas, Gautam; Ghoshdastidar, P. S.

doi:10.1016/j.ijheatmasstransfer.2011.06.010

Cited by 53 publications

(30 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some work has been performed on mathematically predicting adiabatic bubble formation and include the use of the boundary integral method [17][18][19][20][21], the Lattice-Boltzmann method [22] and numerical integration of the capillary equation [23][24][25]. More recently, CFD simulations have been performed to study various aspects of adiabatic bubble formation [26][27][28][29][30][31][32][33] on submerged orifices and nozzles and the results show that this is a very promising avenue for research in this branch of physics.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of gas injected bubble growth from submerged orifices

Bari

Robinson

2013

Experimental Thermal and Fluid Science

123

View full text Add to dashboard Cite

a b s t r a c tThis work investigates the mechanism of adiabatic gas bubble growth from submerged orifices with the view of elucidating the interdependence of the bubble shape and the pressure field during growth and departure. Air injection flow rates between 10 mlph and 100 mlph have been tested for orifices of diameters 0.58 mm, 1.05 mm and 1.6 mm. The force field around single isolated bubbles during growth and detachment has been investigated experimentally with the aid of high speed photography and detailed image processing and measurement of the internal bubble pressure. Different flow rates have been compared in order to elucidate dynamic effects. Combining measurements of the instantaneous gas pressure, measurements of the local curvature and the Young-Laplace equation has allowed the estimation of the liquid pressure field acting on the gas-liquid interface over the entire bubble surface. These have subsequently been decomposed into constitutive components such as buoyancy, contact pressure, capillary and the dynamic pressure forces.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental study of gas injected bubble growth from submerged orifices

Bari

Robinson

2013

Experimental Thermal and Fluid Science

123

View full text Add to dashboard Cite

show abstract

“…First, we validate our computational results with the benchmark scaling laws from very low to high flowrate regimes of bubble formation. Then, we extend previous studies 32,35,[56][57][58] to include time periodic bubbling regimes by means of qualitative and quantitative analyses, the interaction and coalescence behavior of bubbles in period-2 with pairing and coalescence bubbling regime, the transition between period-1 and period-2 with pairing and coalescence bubbling regimes characterized by a map that depends on We and Bo and a suitable scaling analysis for the transition. The analysis of other regimes (period-2 with double coalescence regime, period-3, period-4, and chaotic bubbling regimes) of bubble formation at sufficiently high gas flow rates was not investigated.…”

Section: Introductionmentioning

confidence: 72%

“…At the end of this stage, the bubble is detached from the orifice and moves upwards through the liquid. In the present work, complete numerical simulation of the processes of bubble formation under constant-flow conditions 57,58 was performed using a cylindrical coordinate system r; z; h ð Þas shown in Figure 1. The origin of the r; z; h ð Þcoordinate system is placed at the center of the orifice rim, where r is the radial coordinate, z is the axial coordinate measured in the opposite direction of gravity g, and h is the azimuthal coordinate.…”

Section: Formulation Of the Problem Problem Descriptionmentioning

confidence: 99%

“…In our present computations, it was found that the bubble pinched off when the minimum radius of the neck was R min ¼ 110 lm, as also suggested elsewhere. 58,61 Therefore, a very fine grid and very small time step are needed to capture the final instants prior to pinch-off. However, our computations are unable to resolve it owing to limitations of computational resources.…”

Section: Formulation Of the Problem Problem Descriptionmentioning

confidence: 99%

“…The combined level-set and volume-of-fluid (CLSVOF) method 57,58,[62][63][64] was used to perform the numerical simulations. First, we validate our computational results with the benchmark scaling laws from very low to high flowrate regimes of bubble formation.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Bubble formation and dynamics in a quiescent high‐density liquid

et al. 2015

View full text Add to dashboard Cite

Gas bubble formation from a submerged orifice under constant-flow conditions in a quiescent high-density liquid metal, lead-bismuth eutectic (LBE), at high Reynolds numbers was investigated numerically. The numerical simulation was carried out using a coupled level-set and volume-of-fluid method governed by axisymmetric Navier-Stokes equations. The ratio of liquid density to gas density for the system of interest was about 15,261. The bubble formation regimes varied from quasi-static to inertia-dominated and the different bubbling regimes such as period-1 and period-2 with pairing and coalescence were described. The volume of the detached bubble was evaluated for various Weber numbers, We, at a given Bond number, Bo, with Reynolds number Re ) 1. It was found that at high values of the Weber number, the computed detached bubble volumes approached a 3/5 power law. The different bubbling regimes were identified quantitatively from the time evolution of the growing bubble volume at the orifice. It was shown that the growing volume of two consecutive bubbles in the period-2 bubbling regime was not the same whereas it was the same for the period-1 bubbling regime. The influence of grid resolution on the transition from period-1 to period-2 with pairing and coalescence bubbling regimes was investigated. It was observed that the transition is extremely sensitive to the grid size. The transition of period-1 and period-2 with pairing and coalescence is shown on a Weber-Bond numbers map. The critical value of Weber number signalling the transition from period-1 to period-2 with pairing and coalescence decreases with Bond number as We $ Bo 21 , which is shown to be consistent with the scaling arguments. Furthermore, comparisons of the dynamics of bubble formation and bubble coalescence in LBE and water systems are discussed. It was found that in a high Reynolds number bubble formation regime, a difference exists in the transition from period-1 to period-2 with pairing and coalescence between the bubbles formed in water and the bubbles formed in LBE. V C 2015 American Institute of Chemical Engineers AIChE J, 61: 3996-4012, 2015

show abstract

Breakup dynamics of slender bubbles in non‐newtonian fluids in microfluidic flow‐focusing devices

Fünfschilling

Zhu

et al. 2012

AIChE Journal

View full text Add to dashboard Cite

International audienceThis study aims to investigate the breakup of slender bubbles in non-Newtonian fluids in microfluidic flow-focusing devices using a high-speed camera and a microparticle image velocimetry (micro-PIV) system. Experiments were conducted in 400- and 600-mu m square microchannels. The variation of the minimum width of gaseous thread with the remaining time before pinch-off could be scaled as a power-law relationship with an exponent less than 1/3, obtained for the pinch-off of bubbles in Newtonian fluids. The velocity field and spatial viscosity distribution in the liquid phase around the gaseous thread were determined by micro-PIV to understand the bubble breakup mechanism. A scaling law was proposed to describe the size of bubbles generated in these non-Newtonian fluids at microscale. The results revealed that the rheological properties of the continuous phase affect significantly the bubble breakup in such microdevice

show abstract

Bubble generation in quiescent and co-flowing liquids

Cited by 53 publications

References 43 publications

Experimental study of gas injected bubble growth from submerged orifices

Experimental study of gas injected bubble growth from submerged orifices

Bubble formation and dynamics in a quiescent high‐density liquid

Breakup dynamics of slender bubbles in non‐newtonian fluids in microfluidic flow‐focusing devices

Contact Info

Product

Resources

About