Circulation characteristics of a natural-circulation loop in a large-scale model for a weakly boiling reactor

Alferov, N. S.; Babykin, A. S.; Balunov, B. F.; Vakhrushev, V.V.; Kuul, V. S.; Smirnov, E. L.

doi:10.1007/bf01125352

Cited by 2 publications

(3 citation statements)

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“…The small influence of the bubble radius R B (especially for high Re B ) on the model predictions is due to the fact that this model depends only on the ratio C DB / R B and not on both quantities separately (cfr. sets (8) and (22)).…”

Section: Resultsmentioning

confidence: 99%

“…The contraction length L c is the distance between the upstream cross-section A 1 and the vena contracta A c . Because the value of L c has the same order of magnitude than the pipe diameter, the gravity term in the set (8) can be neglected without loss of accuracy in comparison with the variation of fluid kinetic energy. The model for the contraction zone (8) involves five variables of flow: p, T, V G , V L and a.…”

Section: Contraction Zone Modelmentioning

confidence: 99%

“…This effective density is a function of the void fraction or the slip ratio at the orifice. On the basis of the momentum and mechanical energy balance laws applied to the gas-liquid flow through an abrupt contraction, Weisman et al [7], AlFerov and Shul'Zhenko [8], Chen et al [9] and Tapucu et al [10] have obtained formulations taking into account the slip motion between the two fluids. These separated-phase models need the knowledge of the void fraction or the slip ratio at the vicinity of the abrupt area change.…”

Section: Introductionmentioning

confidence: 99%

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A Model for Pressure Drop of Gas-Liquid Bubbly Flow through an Orifice or an Abrupt Pipe Contraction

Attou¹,

Bolle²

1999

Chem. Eng. Technol.

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A new physical model is developed to predict the pressure drop of a steady-state gas-liquid bubbly flow through an orifice or an abrupt pipe contraction. The formulation of the model involves balance equations deduced from the macroscopic mass, momentum, entropy and energy conservation laws as well as a balance of forces exerted on the dispersed bubbles phase. The thermal equilibrium between phases is assumed but the gas-liquid slip motion is taken into account. The gas-liquid interaction and the wall shear stress are evaluated from theoretical considerations. The predictions of pressure drop from the model are found to be in good agreement with several experimental data of the literature obtained for bubbly air-water flows through orifices. In agreement with the experimental observations, the theoretical predictions show that the two-phase pressure drop multiplier is not strongly influenced by the pipe diameter and increases slightly with the cross-sectional area ratio of the orifice. An essential feature of the present model is the absence of adjustable constants.

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Section: Resultsmentioning

confidence: 99%

Section: Contraction Zone Modelmentioning

confidence: 99%