Numerical simulation and analysis of a novel variable-diameter pulsating heat pipe
In this paper,a new type of pulsating heat pipe with variable diameter was designed by using the U-bend of the traditional pulsating heat pipe as elbow shape and the adiabatic section as partial gradual transition structure.The characteristics of gas-liquid phase,flow rate of working medium and thermal resistance of a new type pulsating heat pipe were analyzed by nu-merical simulation.The results show that the new type pulsating heat pipe pulsates faster than the traditional pulsating heat pipe when the filling rate is 70％.The new type of pulsating heat pipe has lower thermal resistance.When the heating power is 35.77 W,the thermal resistance of the traditional pulsating heat pipe is reduced by 32％.At the same time,there is a certain law be-tween the change of the heat pipe temperature curve and the heating power.According to the difference of the temperature curve change from the starting stage to the steady state stage,the temperature curve is divided into over-damped type,under-damped type and transient type.
Pulsating heat pipeNumerical analysisVariable diametersHeat and mass transfer
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