Abstract
Circulation characteristics and flow instabilities are investigated in a natural circulation loop of liquid nitrogen. The circulation velocity increases with the increase in the heat flux and decreases with the increase in the flow restriction. Beyond a certain limit of heat flux, so called “density wave oscillation” occurs. By applying a lumped-parameter model and homogeneous two-phase flow model to the present natural circulation system, the numerical simulation is conducted. The simulation well represents the transient behavior of the system and the estimated threshold conditions of the flow oscillation agree well with the experimental results.
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