Effect of Tube Length and Liquid Filling Ratio on Performance of Parallel-Tube Heat Transport Device

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The influence of tube length (adiabatic section) and Liquid Filling Ratio have been carried out in a Parallel-Tube Heat Transport Devices (PT-HTD) at sub-atmosphere by using water as a working fluid. The PT-HTD has an upper condenser chamber and a lower evaporator chamber which were vertically set. The backside of the bottom evaporator chamber was heated by ceramic heaters and that of the top condenser chamber cooled by water flow. In the present PT-HTD, evaporator and condenser chambers were connected through five parallel tubes of the same inner diameter of 3.6mm. The tube length were L= 500, 1000 and 1500 mm and the liquid filling ratio were γ = 0.66, 1.2, 1.8 and 2.5 (γ is based on total volume of evaporator). Despite large differences in tube length, the heat transport rate of PT-HTD does not differ much. It was found that the heat transport rate of PT-HTD decreases with an increase of liquid filling ratio. Furthermore, the unstable in temperature of evaporator wall and pressures fluctuation were also investigated.
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