Prediction of Missouri S&amp;T Reactor's natural convection with porous media approximation

Sipaun, Susan Maria; Usman, Shoaib

doi:10.1016/j.nucengdes.2015.01.001

Cited by 11 publications

(3 citation statements)

References 6 publications

(11 reference statements)

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“…The authors of work [5] applied the porous medium model to simulate the core of a nuclear reactor, supplementing it with a heat transfer model. Papers [6][7][8] presented the results of using porous medium models to calculate the thermal hydraulics of nuclear power plant equipment. In each of these studies, the models were used to reduce the calculation time while maintaining a sufficient level of modeling accuracy.…”

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

“…In this work, the CFD model utilized a user-defined equation of state model by specifying density as a function of temperature. This approach is considered to be less restrictive in terms of temperature gradient requirements and is able to capture simulated convection closer to actual conditions [19]. In order to obtain such a motion we have set all properties as a function of temperature.…”

Section: Model Assumptions and Boundarymentioning

confidence: 99%

CFD Analysis of the Primary Cooling System for the Small Modular Natural Circulation Lead Cooled Fast Reactor SNRLFR-100

Zhao

Shi

et al. 2016

Science and Technology of Nuclear Installations

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Small modular reactor (SMR) has drawn wide attention in the past decades, and Lead cooled fast reactor (LFR) is one of the most promising advanced reactors which are able to meet the safety economic goals of Gen-IV nuclear energy systems. A small modular natural circulation lead cooled fast reactor-100 MWth (SNRLFR-100) is being developed by University of Science and Technology of China (USTC). In the present work, a 3D CFD model, primary heat exchanger model, fuel pin model, and point kinetic model were established based on some reasonable simplifications and assumptions, the steady-state natural circulation characteristics of SNCLFR-100 primary cooling system were discussed and illustrated, and some reasonable suggestions were proposed for the reactor’s thermal-hydraulic and structural design. Moreover, in order to have a first evaluation of the system behavior in accident conditions, an unprotected loss of heat sink (ULOHS) transient simulation at beginning of the reactor cycle (BOC) has been analyzed and discussed based on the steady-state simulation results. The key temperatures of the reactor core are all under the safety limits at transient state; the reactor has excellent thermal-hydraulic performance.

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“…The porous media model adds a source term into the momentum equation to simulate the solid resistance to the fluid flow in the calculation region [13]. The porous media model has been successfully used to simulate several types of reactors to investigate various practical problems, such as the thermal-hydraulic analysis of CARR [14], the modeling of the Missouri S&T Reactor's natural convection [15], the simulations of the fluid flow and heat transfer in the Advanced CANDU Reactor [16], and the CFD analyses of the MYRRHA primary cooling system [17].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Flow and Temperature Distributions in a High Flux Research Reactor Using the Porous Media Approach

Huang

Gong

et al. 2017

Science and Technology of Nuclear Installations

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High thermal neutron fluxes are needed in some research reactors and for irradiation tests of materials. A High Flux Research Reactor (HFRR) with an inverse flux trap-converter target structure is being developed by the Reactor Engineering Analysis Lab (REAL) at Tsinghua University. This paper studies the safety of the HFRR core by full core flow and temperature calculations using the porous media approach. The thermal nonequilibrium model is used in the porous media energy equation to calculate coolant and fuel assembly temperatures separately. The calculation results show that the coolant temperature keeps increasing along the flow direction, while the fuel temperature increases first and decreases afterwards. As long as the inlet coolant mass flow rate is greater than 450 kg/s, the peak cladding temperatures in the fuel assemblies are lower than the local saturation temperatures and no boiling exists. The flow distribution in the core is homogeneous with a small flow rate variation less than 5% for different assemblies. A large recirculation zone is observed in the outlet region. Moreover, the porous media model is compared with the exact model and found to be much more efficient than a detailed simulation of all the core components.

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Prediction of Missouri S&T Reactor's natural convection with porous media approximation

Cited by 11 publications

References 6 publications

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

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

CFD Analysis of the Primary Cooling System for the Small Modular Natural Circulation Lead Cooled Fast Reactor SNRLFR-100

Prediction of Flow and Temperature Distributions in a High Flux Research Reactor Using the Porous Media Approach

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