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Multiphase Science and Technology
SJR: 0.183 SNIP: 0.483 CiteScore™: 0.5

ISSN 印刷: 0276-1459
ISSN オンライン: 1943-6181

Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.2019030725
pages 255-272

NUMERICAL SIMULATION OF BUBBLE FORMATION IN A MICROCHANNEL USING A MICROPILLAR

Luz Amaya
Central Connecticut State University, 1615 Stanley Street, New Britain, Connecticut 06050, USA

要約

A three-dimensional numerical simulation of bubble formation in a microchannel with a micropillar is investigated. Simulation results are validated against experimental data, where the working fluids are water and nitrogen. The gas enters the microchannel through a single slit located at 0 degrees, along the pillar's depth. This is the first computational study performed with these flow conditions, and it aims to expand the experimental results in order to obtain a better understanding of the formation process and the flow patterns. The bubble formation process has two distinct main regimes, namely, discrete bubble and attached ligament, as well as a transitional regime between them. The transformation from one regime to another is dictated by the capillary number (Ca) and the volumetric flow ratio (Q). An analysis is performed to evaluate the critical values at which the transformation takes place. In addition, for the discrete bubble regime, the simulation results provide a proportional correlation between Q and the size of bubbles, and an inversely proportional relationship between Q and formation time, for each Ca. The computations are performed in the range of 1 × 10-3Ca ≤ × 10-2 and 1 × 10-3Q ≤ 9 × 10-1.

参考

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  2. Dietrich, N., Poncin, S., Midoux, N., and Li, H.Z., Bubble Formation Dynamics in Various Flow-Focusing Microdevices, Langmuir, vol. 24, pp. 13904-13911, 2008.

  3. Dollet, B., Van Hoeve, W., Raven, J.P., Marmottant, P., and Versluis, M., Role of the Channel Geometry on the Bubble Pinch-Off in Flow Focusing Devices, Phys. Rev. Lett., vol. 100, p. 034504,2008.

  4. Elcock, D., Jung, J., Kuo, C.J., Amitay, M., andPeles, Y., Interaction of a Liquid Flow around a Micropillar with a Gas Jet, Phys. Fluids, vol. 23, p. 122001,2011.

  5. Garstecki, P., Fuerstman, M., Stone, H.A., and Whitesides, G.M., Formation of Droplets and Bubbles in a Microfluidic T-Junction-Scaling and Mechanism of Break-Up, Lab Chip, vol. 6, pp. 437-446,2006.

  6. Hermansson, K., Lindberg, U., Hok, B., and Palmskog, G., Wetting Properties of Silicon Surfaces, in Int. Conf. on Solid-State Sensors and Actuators, Digest of Technical Papers, San Francisco, CA, 1991.

  7. Houshmand, F., Elcock, D., Amitay, M., and Peles, Y., Bubble Formation from a Micro-Pillar in a Microchannel, Int. J. Multiphase Flow, vol. 59, pp. 44-53,2014.

  8. Houshmand, F. and Peles, Y., Impact of Flow Dynamics on the Heat Transfer of Bubbly Flow in a Microchannel, J. Heat Transf., vol. 136, p. 022902,2013.

  9. Mansour, M., Kawahara, A., and Sadatomi, M., Numerical Investigation of Two-Phase Flow through T-Junction Microchannel Reactor, J. Environ. Sci. Eng., vol. 3, pp. 42-54,2014.

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  12. Van Steijn, V., Kleijn, C.R., and Kreutzer, M.T., Flows around Confined Bubbles and Their Importance in Triggering Pinch-Off, Phys. Rev. Lett., vol. 103, p. 214501,2009.

  13. Van Steijn, V., Kreutzer, M.T., and Kleijn, C.R., pPIV Study of the Formation of Segmented Flow in Microfluidic T-Junctions, Chem. Eng. Sci., vol. 62, pp. 7505-7514,2007.

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