Description of the experimental studies of coolant mixing flows in the reactor pressure vessel

Баринов, А. А.; Dmitriev, S. M.; Dobrov, A. A.; Doronkov, D. V.; Khrobostov, A. E.; Pronin, A. N.; Ryazanov, A. V.; Solntsev, D. N.; Zorina, O. S.

doi:10.1088/1742-6596/1128/1/012028

Cited by 3 publications

(2 citation statements)

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“…R.E. Alekseev (Nizhny Novgorod, Russia), an experimental thermophysical facility FT-40 [2,3] was created to study the processes of mixing non-isothermal flows of water coolant in models of equipment for nuclear power plants. This research facility is universal and multifunctional, which causes periodic changes in both its operating modes and the design of working sections, as well as the requirements for accuracy in maintaining the specified thermophysical parameters of the working environment.…”

Section: Heat Exchanger With Sbrcmentioning

confidence: 99%

CFD Modeling of Heat Exchanger with Small Bent Radius Coils Using Porous Media Model

Dmitriev

Kurkin

Dobrov

et al. 2023

Fluids

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The efficiency of heat transfer in air-cooled heat exchangers of various industrial facilities depends on the flow rate of the coolant, its inlet temperature and ambient temperature. These parameters are transient and depend both on the features of the technological process and on weather conditions. One option for a compact design of heat exchangers is the use of close-packed coils with a small bending radius. In this case, heat transfer in the complex geometry of the annular space cannot be described by simple one-dimensional dependencies. To solve this problem, it is necessary to consider the three-dimensional spatial structure of the heat exchange surface. Since the size of the grid elements will be several orders of magnitude less than the size of the facility, the size of the computational grids for CFD modeling full-scale heat exchangers will be billions of finite volumes, and even on powerful supercomputers, the solution time will be about a month. One way to reduce computational costs is to use reduced order models, in which the computational domain is not modeled directly; instead, simplified models, such as a porous medium model, are used to describe it. However, such models require additional closing relations and coefficients that characterize the actual channel geometry. This paper presents a technique for creating a digital twin of a heat exchanger with small bend radius coils based on a porous medium model. The values of heat transfer coefficients and hydraulic resistance depend on the speed of air movement in the space between the coils. The calculated value of the thermal power obtained using the strengthened model was 529 kW, which corresponds to the passport data of 500 kW, with less than 6% deviation for the heat exchanger under study. This confirms the correctness of the calculation with accepted simplifications. The calculation time in this case was only a few minutes when using a personal computer. The developed numerical model allows for the resolution of performance characteristics based on the temperature of the cooled medium at the inlet, air temperature, and fan speed. Analyzing the different modes of turning on the cooling fans made it possible to determine the values of the thermal power when turning off the fans or reducing the number of revolutions.

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Section: Heat Exchanger With Sbrcmentioning

confidence: 99%

CFD Modeling of Heat Exchanger with Small Bent Radius Coils Using Porous Media Model

Dmitriev

Kurkin

Dobrov

et al. 2023

Fluids

View full text Add to dashboard Cite

show abstract

“…1) is an aerodynamic open loop. It was designed for research of local values of flow velocity and pressure, as well as mixing of coolant in models of main equipment of nuclear reactors [10][11][12][13]. The stand includes: high-pressure fan, receiver tank, pipeline system, experimental model, measuring devices.…”

Section: Experimental Facilitymentioning

confidence: 99%