Two-Phase Flow Patterns with High-Pressure Water in a Heated Four-Rod Bundle

Williams, C. L.; Peterson, A.C.

doi:10.13182/nse78-a27286

Cited by 23 publications

(2 citation statements)

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“…In spite of a huge number of studies on the two-phase flow patterns, 7) our knowledge on flow patterns in rod bundles is still rudimentary. [8][9][10] This is definitely due to the presence of rods, which hinders the visualization of gas-liquid two-phase flow patterns in a rod bundle. Venkateswararao et al 10) observed air-water two-phase flow patterns in a rod bundle consisting of transparent Plexiglas rods of 12.7 mm in diameter and a transparent cylindrical shroud of 102 mm in inside diameter.…”

Section: Introductionmentioning

confidence: 99%

Two-phase Flow Patterns in a Four by Four Rod Bundle

Mizutani

Tomiyama

Hosokawa

et al. 2007

J. Nucl. Sci. Technol.

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Air-water two-phase flow patterns in a four by four square lattice rod bundle consisting of an acrylic channel box of 68 mm in width and transparent rods of 12 mm in diameter were observed by utilizing a high speed video camera, FEP (fluorinated ethylene propylene) tubes for rods, and a fiberscope inserted in a rod. The FEP possesses the same refractive index as water, and thereby, whole flow patterns in the bundle and local flow patterns in subchannels were successfully visualized with little optical distortion. The ranges of gas and liquid volume fluxes, hJ G i and hJ L i, in the present experiments were 0:1 < hJ L i < 2:0 m/s and 0:06 < hJ G i < 8:85 m/s, which covered typical two-phase flow patterns appearing in a fuel bundle of a boiling water nuclear reactor. As a result, the following conclusions were obtained: (1) the region of slug flow in the hJ G i-hJ L i flow pattern diagram is so narrow that it can be regarded as a boundary between bubbly and churn flows, (2) the boundary between bubbly and churn flows is close to the boundary between bubbly and slug flows of the Mishima and Ishii's flow pattern transition model, and (3) the boundary between churn and annular flows is close to the Mishima and Ishii's model.

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Section: Introductionmentioning

confidence: 99%

Two-phase Flow Patterns in a Four by Four Rod Bundle

Mizutani

Tomiyama

Hosokawa

et al. 2007

J. Nucl. Sci. Technol.

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“…Bergles et al (1968) studied the vapor-water two-phase flow at pressure 6.9 Â 10 6 Pa in a 2 Â 2 rod bundle arranged in a square array. Williams and Peterson (1978) performed a similarly experimental study with a four-rod bundle arranged in a linear array with pressures at 2.76 Â l0 6 Pa, 8.27 Â l0 6 Pa, and 13.79 Â l0 6 Pa. Four typical flow patterns, including bubble, froth, slug, and annular flows, were observed through visualization. Mizutani et al (2007) investigated air-water twophase flow patterns using fluorinated ethylene propylene (FEP) tubes in a 4 Â 4 square lattice rod bundle consisting of an acrylic channel box 68 mm in width and transparent rods 12 mm in diameter.…”

Section: Introductionmentioning

confidence: 99%