Experimental study of pressure drops through LOCA-generated debris deposited on a fuel assembly

An experimental study has been carried out to measure the pressure drop in a 271-pin fuel assembly of a liquid metal reactor. The rod pitch to rod diameter ratio P/D of the fuel assembly is 1.2 and the wire lead length to rod diameter ratio H/D is 24.84. Measurements are made for five different sections in a fuel assembly; inlet orifice, fuel assembly inlet, wire-wrapped fuel assembly, fuel assembly outlet and fuel assembly upper region. A series of water experiments have been conducted changing flow rate and water temperature. It is shown that the pressure drops in the inlet orifice and in the wire-wrapped fuel assembly are much larger than those in other regions. The measured pressure drop data in a wire-wrapped fuel assembly region is compared with the existing four correlations. It is shown that the correlation proposed by Cheng and Todreas fits best with the present experimental data among the four correlations considered.

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Experimental study of water droplet break up in water in oil dispersions using an apparatus that produces localized pressure drops

Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles ◽

10.2516/ogst/2018079 ◽

2019 ◽

Vol 74 ◽

pp. 1 ◽

Cited By ~ 5

Author(s):

Fabricio S. Silva ◽

Ricardo A. Medronho ◽

Luiz Fernando Barca

Keyword(s):

Experimental Study ◽

Droplet Size Distribution ◽

Energy Dissipation Rate ◽

Experimental Results ◽

Good Prediction ◽

Pressure Drops ◽

Turbulence Suppression ◽

Kolmogorov Length Scale ◽

Control Production ◽

Break Up

Oil production facilities have choke/control valves to control production and protect downstream equipment against over pressurization. This process is responsible for droplets break up and the formation of emulsions which are difficult to treat. An experimental study of water in oil dispersion droplets break up in localized pressure drop is presented. To accomplish that, an apparatus simulating a gate valve was constructed. Droplet Size Distribution (DSD) was measured by laser light scattering. Oil physical properties were controlled and three different break up models were compared with the experimental results. All experimental maximum diameters (dmax) were above Kolmogorov length scale. The results show that dmax decreases with increase of energy dissipation rate (ε) according to the relation dmax ∝ ε−0.42. The Hinze (1955, AIChE J.1, 3, 289–295) model failed to predict the experimental results, although, it was able to adjust reasonably well those points when the original proportional constant was changed. It was observed that increasing the dispersed phase concentration increases dmax due to turbulence suppression and/or coalescence phenomenon. Turbulent viscous break up model gave fairly good prediction.

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Measurement of Pressure Drop in a Liquid Metal Reactor Fuel Assembly

Thermal Hydraulic Problems, Sloshing Phenomena, and Extreme Loads on Structures ◽

10.1115/pvp2002-1135 ◽

2002 ◽

Cited By ~ 1

Author(s):

Seok Ki Choi ◽

Il Kon Choi ◽

Kil Yong Lee ◽

Ho Yun Nam ◽

Jong Hyeun Choi ◽

...

Keyword(s):

Experimental Data ◽

Pressure Drop ◽

Liquid Metal ◽

Fuel Assembly ◽

Diameter Ratio ◽

Pressure Drops ◽

Liquid Metal Reactor ◽

The Wire ◽

Measured Pressure ◽

Reactor Fuel Assembly

An experimental study has been carried out to measure the pressure drop in a 271-pin fuel assembly of a liquid metal reactor. The rod pitch to rod diameter ratio (P/D) of the fuel assembly is 1.2 and the wire lead length to rod diameter ratio (H/D) is 24.84. Measurements are made for five different sections in a fuel assembly; inlet orifice, fuel assembly inlet, wire-wrapped fuel assembly, fuel assembly outlet and fuel assembly upper region. A series of water experiments have been conducted changing flow rate and water temperature. It is shown that the pressure drops in the inlet orifice and in the wire-wrapped fuel assembly are much larger than those in other regions. The measured pressure drop data in a wire-wrapped fuel assembly region is compared with the existing four correlations. It is shown that the correlation proposed by Cheng and Todreas fits the best with the present experimental data among the four correlations considered.

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Experimental study on void fraction in a simulated BWR fuel assembly (evaluation of cross-sectional averaged void fraction)

Nuclear Engineering and Design ◽

10.1016/0029-5493(89)90128-3 ◽

1989 ◽

Vol 114 (1) ◽

pp. 91-98 ◽

Cited By ~ 41

Author(s):

Shinichi Morooka ◽

Takao Ishizuka ◽

Masaru Iizuka ◽

Kunihiro Yoshimura

Keyword(s):

Experimental Study ◽

Fuel Assembly ◽

Void Fraction ◽

Cross Sectional ◽

Assembly Evaluation

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Experimental study of local coolant hydrodynamics in TVS-Kvadrat PWR reactor fuel assembly using mixing spacer grids with different types of deflectors

Nuclear Energy and Technology ◽

10.1016/j.nucet.2016.02.019 ◽

2015 ◽

Vol 1 (4) ◽

pp. 296-303

Author(s):

S.M. Dmitriev ◽

S.S. Borodin ◽

A.V. Varentsov ◽

M.A. Legchanov ◽

V.D. Sorokin ◽

...

Keyword(s):

Experimental Study ◽

Fuel Assembly ◽

Reactor Fuel ◽

Spacer Grids ◽

Different Types ◽

Coolant Hydrodynamics ◽

Reactor Fuel Assembly

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Experimental Study on Atomization of Plain Jet Injector Under High Pressure Co-Axial Air Flow

Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations ◽

10.1115/87-gt-56 ◽

1987 ◽

Author(s):

Gui Xiang Yang ◽

J. S. Chin

Keyword(s):

Experimental Study ◽

High Velocity ◽

Drop Size ◽

Air Flow ◽

Test Chamber ◽

Back Pressure ◽

Air Pressure ◽

Working Fluid ◽

Air Velocity ◽

Pressure Drops

An experimental study has been conducted on the effect of high back pressure on the spray characteristics of a plain jet injector under coaxial high velocity air flow. The air pressures tested range from 1 to 16 atm, the range of air velocity is 60–120 m/s, the pressure drops of injector tested are 200–2000 kpa. Working fluid is water. Injector hole diameter is 0.5 mm. The key feature of the experiment is using a convergent-divergent nozzle to maintain a high air pressure inthe test chamber and at the same time to maintain a high velocity air flow in the atomization zone. Such an experimental arrangement totally eliminates air and droplets recirculation in the test chamber and problem related to slow droplet settling in a commonly used pressurized vessel for high back pressure atomization research. The results show that SMD decreases monotonicly with the increase of back pressure or air velocity, at different air velocities, the effect of air pressure is different. The drop size distribution parameter N in Rosin-Rammler distribution decreases slightly with increase of back pressure or air velocity.

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