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Accessible Unlicensed Requires Authentication Published by De Gruyter December 17, 2021

ANSYS-CFX simulation of the SRBTL test loop core with nanofluid coolant

ANSYS-CFX Simulation mit Nanofluid-Kühlmitteln am Beispiel des SRBTL Versuchsstands
B. Khonsha, G. Jahanfarnia, K. Sepanloo, M. Nematollahi and I. Khonsha
From the journal Kerntechnik


In the present study, CFD calculations are presented for the three types of water-based nanofluids Al2O3/water, CuO/water and TiO2/water with 0.1% volume fraction. These calculations are done with ANSYS-CFX and as geometry the SRBTL test loop as scaled down test loop for a VVER-1000 reactor core design is used. The goal of this study is to evaluate the CFD program against the SRBTL test loop core as a scaled core for applying water-based nanofluids as coolant. ANSYS-CFX simulation data are validated against the RELAP5/MOD3.2 simulation data for pure water. This comparison shows a good agreement. The simulation results for the nanofluids and water including Re number, temperature, viscosity, pressure drop and heat transfer coefficient through the SRBTL test loop core are compared. The results of the comparisons show that the SRBTL test loop core is suitable to extract experimental data of water-based nanofluids for using them as coolant in the VVER-1000 reactor.


In der vorliegenden Studie werden CFD-Berechnungen für die drei wasserbasierten Nanofluide Al2O3/Wasser, CuO/Wasser und TiO2/Wasser mit 0,1% Volumenanteil vorgestellt. Diese Berechnungen werden mit ANSYSCFX durchgeführt und als Geometrie wird die SRBTL-Testschleife (als verkleinerte Testschleife für ein WWER-1000-Reaktorkerndesign) verwendet. Das Ziel dieser Studie ist die Bewertung, ob mit Hilfe des CFD-Programms ein skalierter Kern, wie er in der SRBTL Versuchsanlage realisiert ist, für die Anwendung von Nanofluiden auf Wasserbasis als Kühlmittel genutzt werden kann. Die Simulationsdaten von ANSYS-CFX werden gegen die Simulationsdaten von RELAP5/MOD3.2 für reines Wasser validiert. Der Vergleich zwischen diesen zeigt eine gute Übereinstimmung. Die Simulationsergebnisse für die Nanofluide und Wasser einschließlich Re-Zahl, Temperatur, Viskosität, Druckabfall und Wärmeübergangskoeffizient durch den SRBTL-Testschleifenkern werden verglichen. Die Ergebnisse der Vergleiche zeigen, dass der SRBTL-Testschleifenkern geeignet ist, um experimentelle Daten von Nanofluiden auf Wasserbasis für deren Einsatz als Kühlmittel im WWER-1000-Reaktor zu gewinnen.


This study is carried out as a long-term research on thermal-hydraulic scaling and design of a test loop for Science and Research Branch of Islamic Azad University and supported by the Islamic Azad University. The author is pleased to acknowledge Drs. G. Jahanfarnia., K. Sepanloo and M. Nematollahi for their supports of the study.





Computational Fluid Dynamic


Critical heat flux


Dimensionless Parameter


Fuel Assemblies


Fuel Elements


Heat Exchanger


In-Vessel Retention


Minimum Departure from Nucleate Boiling Ratio


Science and Research Branch Test Loop


Reactor Coolant Pump




Steam Generator


Russian Pressurized Water Type Reactor



flow area (m2)


specific heat capacity (J/kg K)


coolant temperature (k)


velocity (m/s)


volume (m3)


Reynolds number


Nusselt number


pressure (Pa)


Prandtl number


heat flux (W/m2)


thermal conductivity (W/mK)


Boltzman constant (1.3807 × 10–23) (J/K)


pressure drop coefficient


mass flux, Kg/m2s


enthalpy (J/kg)


nanoparticle diameter (nm)


fluid density, kg/m3


Volume fraction





coolant bulk


base fluid








wall surface


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Received: 2020-08-22
Published Online: 2021-12-17

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