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The cooling of a heat-generating system is one of the biggest concerns in the field of thermal engineering. Hence, the focus is on such cooling systems which do not involve any active components (passive systems) for high reliability and compact size. For this reason, in heat transfer, the natural circulation loop (NCL) is used extensively. NCL works as a cooling system by removing heat from a lower-elevation heat source and deposit the heat to a higher-elevation heat sink by the moving fluid present in it. As spontaneous dynamics of the working fluid plays a very important role in the performance of the system, it is necessary to study proper fluid flow dynamics. With increase in heater power, a change in loop fluid flow dynamics has been observed. For the comparatively low heater power, we observed steady flow, and with the increase in heater power first, we obtained the oscillatory flow, and then with the addition of more heater power, we observed flow reversal. In this study, we first investigated the instability associated with the loop fluid flow with the help of recurrence plot. Along with recurrence plot we also compute the recurrence quantification analysis. From the recurrence quantification analysis, we can predict early about the change in flow pattern from oscillatory region to flow-reversal region.

Flow dynamic study of a single-phase square NCL using recurrence plot and recurrence quantification