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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.v21.i4.20
pages 279-295

TWO-PHASE FLOW AND HEAT TRANSFER IN MICROTUBES UNDER NORMAL AND MICROGRAVITY CONDITIONS

C. Narayanan
ASCOMP GmbH, Technoparkstrasse 1, CH-8005 Zurich, Switzerland
D. Lakehal
ASCOMP GmbH, Technoparkstrasse 1, CH-8005 Zurich, Switzerland

要約

Detailed numerical simulations have been performed to study the effect of gravity on two-phase flow heat transfer (without phase change) in small-diameter pipes. Effect of the flow orientation with respect to gravity is investigated. Overall, the heat removal rate in two-phase flow was shown to be significantly higher than in single-phase flow. The downstream flow can be characterized as a periodic flow around each bubble/slug rather, where the shapes of the inclusions and the flow around them reach a repeatable state. The flow regime, viz. bubbly, slug, and slug-train, is found to have a strong influence on the heat transfer and pressure drop. The wall thermal layer is affected by the blockage effect of the inclusions, which manifests itself in a circulating liquid flow pattern superimposed on the equivalent single-phase fully developed flow. The Nusselt number distribution shows that the bubbly, slug, and slug-train regimes transport as much as three to four times more heat from the tube wall to the bulk flow than pure water flow. For upflow, the breakup into bubbles/slugs occurs earlier and at a larger frequency. Overall, the average Nusselt numbers are not significantly affected by the flow orientation with respect to gravity. A mechanistic heat transfer model is proposed, based on frequency and length scale of inclusions. The results found here suggest that a microgravity experimental campaign dealing with air water systems can be performed by European Space Agency on its space Fluid-Lab facility.

参考

  1. Chen, W. L., Twu, M. C., and Pan, C., Gas-liquid two-phase flow in microchannels.

  2. Dittus, F. W. and Boelter, L. M. K., Heat transfer in automobile radiators of the tubular type. DOI: 10.1016/0735-1933(85)90003-X

  3. Higbie, R., The role of absorption of pure gas into a still liquid during short period of exposure.

  4. Lakehal, D., Larrignon, G., and Narayanan, C., Computational heat transfer and two-phase flow topology in miniature tube. DOI: 10.1007/s10404-007-0176-1

  5. Lakehal, D., Meier, M., and Fulgosi, M., Interface tracking for the prediction of interfacial dynamics and heat/mass transfer in multiphase flows.

  6. Leonard, B. P., A stable and accurate convective modelling procedure based on quadratic interpolation. DOI: 10.1016/0045-7825(79)90034-3

  7. Monde, M. and Mitsutake, Y., Enhancement of heat transfer due to bubble passing through a narrow vertical rectangular channel. DOI: 10.1007/BF02537424

  8. Sparrow, E. M. and Patankar, S. V., Relationship among boundary conditions and nusselt numbers for thermally developed duct flows.

  9. Sussman, M., Smereka, P., and Osher, S., A Levelset Approach for computing incompressible two-phase flow.

  10. Takahira, H., Takahashi, M., and Banerjee, S., Numerical analysis of three-dimensional bubble growth and detachment in a shear flow.

  11. Thome, J. R., Dupont, V., and Jacobi, A. M., Heat transfer model for evaporation in microchannels. Part I: Presentation of the model. DOI: 10.1016/j.ijheatmasstransfer.2004.01.006

  12. Ua-Arayaporn, P., Fugakata, K., Kasagi, N., and Himeno, T., Numerical simulation of gas-liquid two-phase convective heat transfer in a microtube.


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