Pulsating Heat Pipe (PHP) has the turn structure of capillary and the mechanism is paid much more attention. The circulation of Looped Pulsating Heat Pipe (LPHP) is modelled to couple the heat transfers, volume flow rates, operational driving forces and flow resistances. The analysis and calculation show that, the square capillary LPHP can be optimized by adjusting the coupled dominating parameters to improve the flow and performance. The working fluid, the transferred power and the dynamic diameter will exert essential influences on the LPHP performance, the thermal resistance of the LPHP can be as small as 0.05°C/W.

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