This study focuses on the heat transfer and flow characteristics of the evaporator of a loop thermosiphon system. The loop thermosiphon is a type of heat pipe that is driven by gravity rather than a pump. Thus, the flow and heat transfer characteristics may be different from those for pump driven forced convection boiling. It is important to investigate the heat transfer and flow conditions of the loop thermosiphon. This study is focused on the working conditions at different filling ratios, particularly the relationship between the mass flow and boiling heat transfer inside the evaporator. In the experiment, the heat transfer capacity varies in the range of approximately 200–1000 W and the filling ratio is approximately 60%-130%. Three major results are obtained: (1) when the filling ratio is greater than 100%, the real mass flow rate is much higher than the pure vapor mass flow rate, and the higher the filling ratio, the larger the mass flow rate will be; (2) the filling ratio will influence the mass flow rate of the coolant and the mass flow rate will then influence the vapor quality of the evaporator; and (3) the boiling heat transfer coefficient does not vary with the filling ratio, even though the mass flow rate at different filling ratios changes significantly

这项研究的重点是环路热虹吸系统的蒸发器的传热和流动特性。回路热虹吸管是一种由重力而非泵驱动的热管。因此，流动和传热特性可能与泵驱动的强制对流沸腾特性不同。重要的是研究回路热虹吸管的传热和流动条件。这项研究的重点是不同填充率下的工作条件，特别是蒸发器内部的质量流量与沸腾传热之间的关系。在实验中，传热能力在大约200–1000 W的范围内变化，填充率大约为60％-130％。获得了三个主要结果：（1）当填充率大于100％时，实际质量流量远高于纯蒸气质量流量，填充率越高，质量流量就越大。（2）填充率将影响冷却剂的质量流量，然后质量流量将影响蒸发器的蒸气质量；（3）即使不同填充率下的质量流量发生显着变化，沸腾换热系数也不会随填充率而变化。