Investigations on Low Power Low Pressure Instability

Investigations on Low Power Low Pressure Instability

Naveen Kumar^1,a, J. B. Doshi², P. K. Vijayan^1,b and D. Saha^1,c

¹Reactor Engineering Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.

^aknaveen@barc.gov.in ^bvijayanp@barc.gov.in ^cdsaha@barc.gov.in

²Department of Mechanical Engineering, IIT Bombay, Mumbai 400 076, India.

doshi@me.iitb.ac.in

ABSTRACT

In this study, a mathematical model has been developed for the simulation of start-up of boiling natural circulation loops from low pressure low power conditions. Flashing in the riser, caused by decrease in hydrostatic head plays an important role in the dynamics of systems having tall risers. To simulate the effect of adiabatic flashing on loop dynamics, the fluid properties are evaluated at local pressure. The model has been used to simulate the dynamic behaviour of a twophase boiling natural circulation loop. In this paper, the model predictions have been compared with the experimental data and mechanism of different flow instabilities encountered in natural circulation systems is discussed.

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Investigations on Low Power Low Pressure Instability

Naveen Kumar1,a, J. B. Doshi2, P. K. Vijayan1,b and D. Saha1,c

1Reactor Engineering Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.

2Department of Mechanical Engineering, IIT Bombay, Mumbai 400 076, India.

ABSTRACT

Naveen Kumar^1,a, J. B. Doshi², P. K. Vijayan^1,b and D. Saha^1,c

¹Reactor Engineering Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.

²Department of Mechanical Engineering, IIT Bombay, Mumbai 400 076, India.