Determination of void fraction for upward steam-water flow in a packed bed
This paper presents the results of a void fraction study for a steam-water flow in a channel that contains a close-packed bed of solid spherical particles. Investigations of a two-phase flow motion through random layers of solid particles are crucial for the energy industry to design future nuclear reactors with spherical coated fuel particles and analyze post-emergency cooling of material fragments in the core of light water reactors. An experimental setup and a new measurement method combining a flow cutoff method and the use of additional water are described. Experiments were carried out with a packed bed of particles with diameters of 2 and 4 mm at a pressure of 0.12–0.9 MPa and a mass velocity of 28–300kgm−2s−1. Some measurements were made in a particle-free pipe 39 mm in diameter. The findings have established that the void fraction in packed beds is higher than in a particle-free pipe, is insensitive to the particle size, and, in the considered range of values, increases with a rise in the flow rate or a decline in pressure. The analysis of the known correlations for heated and unheated channels of different geometries and packed beds is conducted. The obtained experimental data is generalized using the drift-flux model and adapted slip ratio models. The paper proposes a modified version of the one-parameter equation for the void fraction in a packed bed with constraints imposed on the difference in the vapor and water filtration velocities. © 2022
Библиографическая ссылка Tairov E., Khan P., Safarov A. Determination of void fraction for upward steam-water flow in a packed bed // International Journal of Heat and Mass Transfer. Vol.194. ID:123022. 2022. DOI: 10.1016/j.ijheatmasstransfer.2022.123022
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