Rough annulus pressure drop—interpretation of experiments and recalculation for square ribs

Maubach, K.

doi:10.1016/0017-9310(72)90142-1

Cited by 43 publications

(4 citation statements)

References 3 publications

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“…At the sufficiently high Reynolds numbers assumed, the methods based on the laws of the wall (Maubach 1970) and used to interpret measurements in annuli (BIaubach 1972) and rod bundles (Maubach & Rehnie 1973) with artificial surface roughnesses are sufficiently well suited for calculations of the flow parameters in smooth annuli also. This is understandable, because the law of the wall of Nikuradse stems from the fact that the influence of the Reynolds number on the velocity profile is neglected, which results in a law for the velocity distribution which is slightly on the crude side.…”

Section: Discussionmentioning

confidence: 99%

“…Universal laws of the velocity distribution in circular tubes were applied to annuli by Tiedt (1966Tiedt ( , 1967Tiedt ( , 1968, Macagno & McDougall (1966), Maubach (1969Maubach ( , 1970 and Wilson & Medwell (1968) and further improved by Quarmby (1968) and Quarmby & Anand (1970). The results of these authors show that the position of the maximum velocity, which is takenas the zero-shear-stress position, is nearer to the inner surface than it is according to the Kays-Leung equation.…”

Section: Theoretical Investigationsmentioning

confidence: 99%

“…the velocities on the same radius agree to within f 0.4 yo. For comparison, the pressure-drop law for circular tubes as given by Maubach (1970) has been added:…”

Section: Symmetry Of the Velocity Profilementioning

confidence: 99%

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Turbulent flow in smooth concentric annuli with small radius ratios

Rehme¹

1974

J. Fluid Mech.

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Fully developed turbulent flow through three concentric annuli was investigated experimentally for a Reynolds-number rangeRe= 2 × 104−2 × 105. Measurements were made of the pressure drop, the positions of zero shear stress and maximum velocity, and the velocity distribution in annuli of radius ratios α = 0.02, 0.04 and 0.1, respectively. The results for the key problem in the flow through annuli, the position of zero shear stress, showed that this position is not coincident with the position of maximum velocity. Furthermore, the investigation showed the strong influence of spacers on the velocity and shear-stress distributions. The numerous theoretical and experimental results in the literature which are based on the coincidence of the positions of zero shear stress and maximum velocity are not in agreement with reality.

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Section: Discussionmentioning

confidence: 99%

Section: Theoretical Investigationsmentioning

confidence: 99%

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Turbulent flow in smooth concentric annuli with small radius ratios

Rehme¹

1974

J. Fluid Mech.

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“…Maubach (2) and Dalle Donne et al (3) evaluated the friction factor and heat transfer correlations in a narrow channel with spacer ribs experimentally. Lee, et al (4) , Acharya, et al (5) , Kariya et al (6) evaluated the heat transfer augmentation due to the spacer ribs using linear and nonlinear turbulence models.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of a Water-Vapor Two-Phase Film Flow in a Narrow Coolant Channel with a Three-Dimensional Rectangular Rib

Takase¹,

Yoshida²,

Ose

et al. 2004

JSME international journal. Ser. B, Fluids and thermal engineer

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A reduced-moderation light water reactor (RMWR), which is studied by the Japan Atomic Energy Research Institute, needs to the volume ratio between the coolant and fuel less than 0.2, in order to achieve 1.1 or more high breeding ratios. The RMWR fuel assembly consists of many fuel rods with a diameter of around 10 mm with the triangular tight-lattice configuration in the radial direction. A minimum gap width between adjacent fuel rods is about 1 mm. Moreover, spacers are set to keep uniformly the gap width between fuel rods horizontally. These spacers are installed at a fixed interval to the flow direction in a reactor core. As a result of this, a complicated flow is formed around each spacer because of a large flow disturbance. Then, fundamental liquid film flow behavior in a narrow channel with a three-dimensional rectangular rib was analyzed numerically using a newly developed twophase flow analysis code. From this study the following conclusions were derived: a wake behind the spacer rib takes place easier when the initial film thickness is short and then the gas velocity is higher than the liquid velocity; and, the liquid film thickness reduces with increasing the gas velocity.

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