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Multiphase Science and Technology

Publication de 4  numéros par an

ISSN Imprimer: 0276-1459

ISSN En ligne: 1943-6181

SJR: 0.144 SNIP: 0.256 CiteScore™:: 1.1 H-Index: 24

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VOID DIFFUSION COEFFICIENT IN TWO-PHASE VOID DRIFT FOR SEVERAL CHANNELS OF TWO- AND MULTI-SUBCHANNEL SYSTEMS

Volume 18, Numéro 1, 2006, pp. 31-54
DOI: 10.1615/MultScienTechn.v18.i1.20
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RÉSUMÉ

To improve a void drift model incorporated in a subchannel analysis code, experimental data have been obtained for vertical air-water two-phase flows in several test channels of two- and multi-subchannel systems. In order to know the effects of the lattice of fuel rods on the void drift, the channels made up of two subchannels (i.e., the two-subchannel system) surrounded by square lattice rods or triangle tight lattice rods were included in the experiment. In addition, to know the effects of the number of subchannels, as the multi-subchannel system the channel consisted of six subchannels simulating a square lattice BWR fuel rod bundle was included. In each test channel, the data have been collected on the axial redistributions of flow rates of both phases and void fraction in the respective subchannels. In order to study the effects of two-phase flow regimes or void fraction on the void drift, the flow regimes covered were slug, churn and annular flows with various combinations of air and water flow rates. By fitting the above data with Lahey et al.'s void settling model, we have determined a void diffusion coefficient in their model. The void diffusion coefficient data were compared between the respective test channels as well as Tapucu et al.'s data for a square lattice two-subchannel system. It was found that the void diffusion coefficient was much smaller in the tight lattice channel than the square lattice channels, i.e., a channel size effect. Furthermore, the void diffusion coefficient could be well correlated with the turbulent Peclet number using a subchannel geometry factor, regardless of both the gap clearance between subchannels and the number of subchannels. It was also found that the correlation depends on the rod lattice.

CITÉ PAR
  1. KAWAHARA Akimaro, SADATOMI Michio, SHIRAI Hiroshi, Two-Phase Wall and Interfacial Friction Forces in Triangle Tight Lattice Rod Bundle Subchannel, Journal of Power and Energy Systems, 2, 1, 2008. Crossref

  2. SADATOMI Michio, KAWAHARA Akimaro, HIGUCHI Tatsuya, , Progress in Multiphase Flow Research, 4, 2009. Crossref

  3. Kawahara Akimaro, Sadatomi Michio, Higuchi Tatsuya, Effects of Surface Tension on Two-Phase Void Drift Between Triangle Tight Lattice Subchannels, Journal of Engineering for Gas Turbines and Power, 131, 1, 2009. Crossref

  4. Sharma M. P., Nayak A. K., Experimental Investigation of Void Drift in Simulated Subchannels of a Natural-Circulation Pressure Tube–Type BWR, Nuclear Technology, 197, 2, 2017. Crossref

  5. Mao Hu, Yang Bao-Wen, Wang Sipeng, A Review of Void Drift Models in Subchannel Analysis, Nuclear Science and Engineering, 193, 1-2, 2019. Crossref

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