Temperature Oscillations in Loop Heat Pipe Operations-- a Revisit



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51st International Conference on Environmental Systems


The oscillatory behaviors sometimes observed in Loop Heat Pipe (LHP) operations can be shown as the byproduct of the system (like all other dynamical systems) operating in certain unstable regimes. A LHP operational stability theory based on an linearized approximation was first introduced in 2014 focusing on the criteria for the appearance of High Frequency Low Amplitude (HFLA) and Low Frequency High Amplitude (LFHA) temperature oscillations for "unforced" external conditions (i.e. the power input, sink & ambient temperatures remain constant). In the current paper, the nonlinear effects shall be taken into consideration to reveal the transient behaviors of the LHP temperatures after the oscillations appear. In addition, test data from several LHPs are used to verify the updated theory.


Triem Hoang, TTH Research Inc., US
ICES201: Two-Phase Thermal Control Technology
The 51st International Conference on Environmental Systems was held in Saint Paul, Minnesota, US, on 10 July 2022 through 14 July 2022.


Loop Heat Pipe, Two-Phase Capillary-Pumped Heat Transport, Temperature Oscillations, Dynamical Systems, Stability Theory