The open system of visual loop heat pipe experimental rig driven by phase change of the refrigerant is established, which is used to research the effect of parameters of the volume, supplementary of refrigerant, properties of wick, height of evaporation cavity and heating power on the performance of this system quantitatively, also the heat transfer characteristics of refrigerant flow in the evaporator visually is studied. We observed and researched the whole process of system from the start up to the stable condition in the evaporator, the changes of refrigerant which is from boiling to the gas-liquid separation. From the experimental point of view, it provides a basis for the establishment of the closed system and for the creation of new mathematical model of the driving mechanism.

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