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本文通过振荡流热管可视化实验,研究热管传热性能与流型的变化。实验中可观察到,振荡热管内工质运动通常处于“间歇-振荡”交替运行的状态。随加热功率的增大,间歇时间所占比例逐步减小。随着加热功率的增大,热管内的流型也发生相应变化,实验中主要观察到了泡状流、塞状流、环状流、局部波状流等多种流型。汽泡的生成、长大、聚合、分离和湮灭等产生的扰动是热管运行的驱动力。弯头是影响热管运行的重要结构。
In this paper, oscillating flow heat pipe visualization experiment to study heat pipe heat transfer performance and flow pattern changes. It can be observed experimentally that the working fluid in the oscillating heat pipe is usually in the state of “intermittent-oscillating” alternately. With the heating power increases, the proportion of intermittent time gradually reduced. As the heating power increases, the flow pattern in the heat pipe also changes correspondingly. In the experiment, many flow patterns, such as bubbly flow, plug flow, annular flow and local wavy flow, are mainly observed. Bubble generation, growth, aggregation, separation and annihilation and other disturbances generated by the heat pipe is the driving force. Elbows are important structures that affect heat pipe operation.