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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental investigation of the effects of heat transport pipeline configurations on the performance of a passive phase-change cooling system
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Experimental investigation of the effects of heat transport pipeline configurations on the performance of a passive phase-change cooling system

机译：热传输管道配置对被动相变冷却系统性能影响的实验研究

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摘要

The separate-type passive phase-change cooling systems provide considerable flexibility in the placement of the evaporator and condenser. An experimental study of flow characteristics and heat transfer during condensation inside the connecting section, i.e. heat transport pipeline, was conducted. Measurements were made in round tubes with diameters ranging from 20 to 38 mm, lengths from 1 to 6 m, and inclination angles from 0° to 30°. Distilled water was used as the working fluid. The study primarily took into account the effect of various parameters (inner diameter, length and inclination angle) on the performance of a cooling system. Flow visualization showed that at all operating conditions the flow pattern was the droplet flow. Heat transfer coefficient increased with increasing tube length, inner diameter and inclination angle. The system pressure drop also increased with an increase in the tube length while decreased with increasing inclination angle. For a constant heat load, an obvious decrease of evaporator temperature was observed for longer tubes. Moreover, the cooling system needed a certain time (defined as "delayed time", represented the robustness of the system) to reach the steady-state again when the heat load increased. Different tube configurations can result in different "delayed time".
机译：分离式被动相变冷却系统为蒸发器和冷凝器的放置提供了相当大的灵活性。进行了在连接部分（即传热管道）内部冷凝期间的流动特性和传热的实验研究。在直径为20至38 mm，长度为1至6 m，倾斜角度为0°至30°的圆管中进行测量。蒸馏水用作工作流体。该研究主要考虑了各种参数（内径，长度和倾斜角度）对冷却系统性能的影响。流量可视化显示，在所有操作条件下，流量模式均为液滴流量。传热系数随管长，内径和倾角的增加而增加。系统压降也随着管长的增加而增加，而随着倾角的增加而减小。对于恒定的热负荷，对于更长的管子，观察到蒸发器温度明显降低。此外，当热负荷增加时，冷却系统需要一定时间（定义为“延迟时间”，代表系统的耐用性）才能再次达到稳态。不同的管配置可能导致不同的“延迟时间”。

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