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为了研究热管倾斜角度和压力对热管蒸发段、冷凝段传热系数以及最大换热功率的影响,对使用水基CuO纳米流体为工质的倾斜微槽道热管强化换热特性进行实验研究.实验装置主要由带角度调节功能的微槽道热管和加热、冷却系统组成.实验结果发现,用水基纳米流体替代去离子水为工质时,热管整体换热特性得到明显增强,蒸发段、冷凝段传热系数以及最大功率都能大幅度提高,总热阻明显降低.倾斜水热管的蒸发段和冷凝段传热系数比水平水热管的有大幅提高,但最大功率变化不大.而倾斜纳米流体热管不但蒸发段和冷凝段传热系数比水平纳米流体热管有大幅提高,而且最大功率更有接近一倍的增加.对水和纳米流体两种工质,对应于最佳换热特性的倾斜角都是75°.因此,纳米流体对倾斜热管有良好的应用前景.
In order to study the influence of the angle and pressure of heat pipe on the heat transfer coefficient and the maximum heat transfer coefficient of the heat pipe, the heat transfer enhancement of inclined micro-channel heat pipe using water-based CuO nanofluid as working medium was experimentally studied. The device is mainly composed of micro-channel heat pipe with angle adjustment function and heating and cooling system.The experimental results show that the overall heat transfer characteristics of the heat pipe are obviously enhanced when the water-based nanofluid instead of deionized water is used as the working medium, the evaporation section, the condensation section Heat transfer coefficient and maximum power can be greatly improved, the total thermal resistance decreased significantly.Transferred coefficient of evaporating section and condensing section of inclined water-heat pipe increased greatly compared with that of horizontal water-heat pipe, but the maximum power did not change much.The inclined nanofluid In heat pipe, the heat transfer coefficient of evaporating section and condensing section is greatly increased than that of horizontal nanofluid heat pipe, and the maximum power is nearly doubled. For the two working fluids of water and nanofluid, the inclination angle corresponding to the best heat transfer characteristic Are 75 ° Therefore, nanofluids on the inclined heat pipe has a good prospect.