CFD Analysis of Molten Fluoride Salt Natural Circulation in a Rectangular Loop

  • Rakesh ChouhanEmail author
  • A. Borgohain
  • A. K. Shrivastava
  • N. K. Maheshwari
  • P. K. Vijayan
Conference paper


Indian Molten Salt Breeder Reactor (IMSBR) is being designed and developed in BARC with main objective of utilizing thorium abundance in India. In order to design the reactor, it is necessary to study the thermal-hydraulic behavior of various molten salts. Moreover, considering the importance of natural circulation in high-temperature systems, experimental studies on natural circulation of molten salts are required. This paper deals with the fabrication of loop with molten salt, LiF + ThF4 (22.5–77.5 wt%), which is proposed as blanket salt for IMSBR program. Loop is fabricated with 15 NB Sch 40 pipe made of Hastelloy-N material having height of 400 mm and width of 300 mm. CFD analysis for natural circulation of the same loop is also carried out. CFD simulation is performed for steady state and transient cases at different heater powers. Various transients, such as step power change, heater trip, and start-up of natural circulation, are also carried out. Comparison of CFD results with standard correlation for steady state flow has been done.


MSBR Molten fluoride salt OpenFOAM Computational domain 



Constant in steady state correlation


Acceleration due to gravity, m/s2


Modified Grashof number


Heat transfer coefficient, W/m2 K


Total length, m


Geometry parameter


Total heat input, W


Constant in steady state correlation


Steady state Reynolds number, vDh/υ


Time, s


Temperature, °C


Velocity along heater


Velocity along cooler


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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • Rakesh Chouhan
    • 1
    Email author
  • A. Borgohain
    • 1
  • A. K. Shrivastava
    • 1
  • N. K. Maheshwari
    • 1
  • P. K. Vijayan
    • 1
  1. 1.Reactor Engineering DivisionBhabha Atomic Research CentreTrombay, MumbaiIndia

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