Heat Transport Capability and Fluid Flow Neutron Radiography of Three-Dimensional Oscillating Heat Pipes.
Heat Transport Capability and Fluid Flow Neutron Radiography of Three-Dimensional Oscillating Heat Pipes.
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DOI：
10.1115/ht2008-56160
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发表时间：
2010-06
期刊：
影响因子：
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通讯作者：
B. Borgmeyer;C. Wilson;R. Winholtz;Hongbin Ma;David L. Jacobson;D. Hussey
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文献类型：
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作者：
B. Borgmeyer;C. Wilson;R. Winholtz;Hongbin Ma;David L. Jacobson;D. Hussey
对两个三维振荡热管中影响传热的参数进行了实验研究。三维OHP是其中包含内部工作流体的圆形通道的中心轴线不位于同一平面中的OHP。这种新颖的设计允许在更紧凑的尺寸中有更多的转弯。当前研究中的OHP由铜管（外径3.175 mm，内径1.65 mm）制成，铜管以三维方式缠绕在两个用作蒸发器和冷凝器的铜散布器周围。两个OHP在蒸发器和冷凝器中都有10圈和20圈。用高效液相色谱级水将20转OHP填充至总体积的50%。在不同位置记录各种参数的瞬态和稳态温度数据。参数，如热输入，工作温度，和填充比变化，以确定其对整体热传输的影响。同时进行中子射线照相术，以每秒30帧的速率创建内部工作流体流的图像。结果表明，从蒸发器到冷凝器的平均温降在较高的热输入下减小，这是由于整个冷凝器区域的温度由于更大的振荡而增加。这些大的振荡是用中子射线照相术直观地观察到的。随着工作温度的升高，热阻降低。填充比的减小倾向于产生更稳定的流体运动;然而，传热性能降低。
An experimental investigation into the parameters affecting heat transport in two three-dimensional oscillating heat pipes (OHPs) was implemented. A three-dimensional OHP is one in which the center axis of the circular channels containing the internal working fluid do not lie in the same plane. This novel design allows for more turns in a more compact size. The OHPs in the current investigation is made of copper tubings (3.175 mm outside diameter, 1.65 mm inside diameter) wrapped in a three-dimensional fashion around two copper spreaders that act as the evaporator and condenser. The two OHPs have 10 and 20 turns in both the evaporator and condenser. The 20-turn OHP was filled to 50% of the total volume with a high performance liquid chromatography grade water. Transient and steady state temperature data were recorded at different locations for various parameters. Parameters such as heat input, operating temperature, and filling ratio were varied to determine its effect on the overall heat transport. Neutron radiography was simultaneously implemented to create images of the internal working fluid flow at a rate of 30 frames per second. Results show the average temperature drop from the evaporator to condenser decreases at higher heat inputs due to an increase in temperature throughout the condenser region due to greater oscillations. These large oscillations were visually observed using neutron radiography. As the operating temperature is increased, the thermal resistance is reduced. A decrease in filling ratio tends to create more steady fluid motion; however, the heat transfer performance is reduced.