A hybrid method for bubble geometry reconstruction in two-phase microchannels

Wang, Evelyn N.; Devasenathipathy, Shankar; Lin, Hao; Hidrovo, Carlos; Santiago, Juan G.; Goodson, Kenneth E.; Kenny, Thomas W.

doi:10.1007/s00348-006-0123-z

Cited by 15 publications

(7 citation statements)

References 30 publications

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“…According to the dimensionless criterion, they drew the bubble shape phase diagram, which is called the Grace diagram. Some scholars [9][10][11] also verified the bubble shape phase diagram obtained by Clift, and found that the result is consistent with the bubble phase diagram. Duineveld [12] found that when the equivalent diameter of the bubble is less than 1.8 mm, because the bubble shape tends to be spherical, the rising path presents a straight line; when the equivalent diameter of the bubble exceeds 1.8 mm, the path of bubble will change from a straight line to a "Z" shape.…”

Section: Introductionsupporting

confidence: 62%

Numerical Study on the Rising Motion of Bubbles near the Wall

Zhang

Chen

et al. 2021

Applied Sciences

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Based on the volume of fluid method (VOF), the rising characteristics of bubbles in near-wall static water are studied. In this study, the influence of the wall on the rising motion of the bubble was studied by changing the distance of the bubble wall, the diameter of the bubble, the arrangement of the bubble and the size ratio, etc. The influence is expressed as the average swing amplitude of the “Z”-shaped motion when the bubble rises. The study found that in the case of a single bubble, the wall surface has a certain influence on the rise of the bubble, and its degree is affected by the bubble wall distance and the bubble diameter. The influence of bubble wall distance is more obvious. The greater the bubble wall distance, the less the bubble is affected by the wall; in the case of double bubbles, the influence of the interaction force between the bubbles is significantly greater than the wall surface.

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Section: Introductionsupporting

confidence: 62%

Numerical Study on the Rising Motion of Bubbles near the Wall

Zhang

Chen

et al. 2021

Applied Sciences

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“…For instance, the advancing and receding angle of microchannel could be estimated by identifying the optimized angle values that provided the best match between the computed flow pattern and the experimental observation. Similar approach has been used in [34] for the prediction of bubble geometry.…”

Section: Resultsmentioning

confidence: 99%

3-D Numerical Simulation of Contact Angle Hysteresis for Slug Flow in Microchannel

Chen

Hidrovo

Wang

et al. 2007

ASME 5th International Conference on Nanochannels, Microchannels, and Minichannels

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Water management that ensures the effective removal of produced water in the microchannel at the cathode is critical for the performance of PEM fuel cells. The small dimension and confined space of channels leads to the importance of the surface force in determining the dynamics of inside liquid slugs. The present study focuses on the simulation of the slug detachment process in the micro-channel, using a contact angle hysteresis model within the framework of VOF approach. Based on solving the nonlinear equations accounting for the relationship among volume fraction, interface position, and contact angle, a special model is developed to replicate the hysteresis effect. In addition, a special algorithm is introduced to simulate the thin liquid/gas films. A systematic comparison between experiment and simulation has been conducted and the quantitative match in terms of slug dimensions is achieved for a wide range of flow conditions. The simulation reveals that the contact angle distribution along the slug profile could be approximated using piecewise linear function. The calculation also shows that the contact angle hysteresis might be responsible for several phenomena observed in experiment, such as slug instability.

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“…They concluded that in early stages bubble growth is dominated by the surface tension force and in later stages bubble growth is controlled by the heat supplied. Wang et al [36] presented hybrid methodology (coupling microresolution particle image velocimetry and threedimensional iterative numerical simulation) that can be used for reconstructing three-dimensional bubble geometry and finding associated three-dimensional velocity field around the bubble during growth at nucleation site. Gedupudi et al [37] addressed flow instabilities and uneven distribution associated with parallel microchannels.…”

Section: Introductionmentioning

confidence: 99%

Simplified Model for Prediction of Bubble Growth at Nucleation Site in Microchannels

Kadam

Baghel

Kumar

2014

Journal of Heat Transfer

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Formation of the first bubble at nucieation site is an inception of the two phase flow in pool boiling and flow boiling. Bubble dynamics (bubble nucieation, growth, and departure) plays an important role in heat transfer and pressure drop characteristics during rv,'o phase flow in microchanneis. In this paper, a simplified model has been developed for predicting bubble growth rate at nucieation cavity in microchannel. It is assumed that heat supplied at nucieation site is divided between the liquid phase and the vapor phase as per instantaneous void fraction value. The energy consumed by the vapor phase is utilized in bubble growth and overcoming resistive effects; surface tension, inertia, shear, gravity, and change in momentum due to evaporation. Proposed model shows a good agreement with available experimental works. In addition, the bubble waiting time phenomenon for flow boiling is also addressed using proposed model. Waiting time predicted by the model is also close to that obtained from experimental data.

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A hybrid method for bubble geometry reconstruction in two-phase microchannels

Cited by 15 publications

References 30 publications

Numerical Study on the Rising Motion of Bubbles near the Wall

Numerical Study on the Rising Motion of Bubbles near the Wall

3-D Numerical Simulation of Contact Angle Hysteresis for Slug Flow in Microchannel

Simplified Model for Prediction of Bubble Growth at Nucleation Site in Microchannels

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