Experimental Investigation of a Negative pressure Loop Heat Pipe with a Flat Plate Evaporator
2011, 31 (6):
A negative pressure copper methanol loop heat pipe （LHP） with a flat plate evaporator was designed for solving the heat dissipation problem of electronic devices with high heat flux. The investigation indicates that this LHP has high capacity of heat dissipation, which is able to start up with or without gravity assistance. When head load is 160W, the evaporator wall temperatures, are 85.8 °C, 66.3 °C and 64.6 °C at three gravity tilt angles of 0°, 18° and 30° respectively. The whole start period of the LHP is divided into three stages,including heat stage, pre start up stage and after start up stage. At low heat load period, the temperature oscillation phenomenon of the LHP occurs. With the gravity tilt angle increasing, both the evaporator wall temperature and the thermal resistance decrease. At the gravity tilt angle of 30° and heat load in the range from 10W to 160W, the LHP thermal resistance lies between 4.97 °C/W and 0.39 °C/W.
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