摘要
本文将流化床换热防垢节能技术与两相闭式重力热管相结合,设计并构建了蒸发段上移的铜/水-碳化硅三相闭式重力热管.分别采用水和碳化硅颗粒作为液相和固相工质,考察了冷却水流量(50~75 L/h)、充液率(15%~30%)和加热功率(100~300W)等操作参数对闭式重力热管传热性能的影响.研究结果表明,碳化硅颗粒的加入可以明显地降低蒸发段上移的闭式重力热管的总热阻,强化传热.实验范围内,总热阻减少率最大为33.8%,相应的充液率为FR=20%,加热功率Q=200W,冷却水流量W=100 L/h.在较低的冷却水流量下,两相和三相闭式重力热管的总热阻随着冷却水流量的增加明显减小,然而,随着冷却水流量的进一步增加,总热阻减小的幅度降低.加热功率较低时,三相闭式重力热管的总热阻随充液率的增加先减小,后增大;加热功率较高时,总热阻随充液率的增加呈现出波动的趋势.构建了操作参数对总热阻减小率影响的三维图.研究结果有助于促进三相闭式重力热管的工业应用.
In this study,a copper(Cu)/water-silicon carbide(SiC)three-phase closed thermosyphon with an upwardmoving evaporation section is designed and built by combining fluidized bed heat transfer and fouling prevention technology with a two-phase closed thermosyphon.Water and SiC solid particles are used as the liquid and solid working media,respectively.The effect of the operating parameters,namely the cooling water flow rate(50—75 L/h),filling ratio(15%—30%),and heating power(100—300W),on the heat transfer performance of the three-phase closed thermosyphon is studied.The results show that adding SiC particles can obviously reduce the overall thermal resistance and enhance the heat transfer of the closed thermosyphon with an upward-moving evaporation section.The maximum reduction rate of the overall thermal resistance was up to 33.8%at FR=20%,Q=200W,and W=100 L/h within the experimental range.The overall thermal resistance of the two-and three-phase closed thermosy phons decreased with the increase in the cooling water flow rate when the cooling water flow rate was low.However,the extent of the decline decreased with a further increase in the cooling water flow rate.The overall thermal resistance of the three-phase closed thermosyphon initially decreased,and then increased with the increase in the filling ratio at a low heating power but fluctuated with the increase in the liquid filling ratio at a high heating power.Three-dimensional diagrams of the effect of the operating parameters on the reduction rate of the overall thermal resistance are established.The obtained findings are beneficial to the industry application of the three-phase closed thermosyphon.
作者
姜峰
李瑞佳
齐国鹏
李修伦
Jiang Feng;Li Ruijia;Qi Guopeng;Li Xiulun(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China;Tianjin Key Laboratory of Chemical Process Safety and Equipment Technology,Tianjin 300350,China;School of Biological and Environmental Engineering,Tianjin Vocational Institute,Tianjin 300410,China)
出处
《天津大学学报（自然科学与工程技术版）》
EI
CAS
CSCD
北大核心
2022年第9期909-918,共10页
Journal of Tianjin University：Science and Technology
基金
化学工程国家重点实验室开放基金资助项目(SKL-ChE-18B03).
关键词
三相闭式重力热管
强化传热
蒸发段上移
冷却水流量
总热阻
碳化硅
three-phase closed thermosyphon
heat transfer enhancement
upward-moving evaporation section
cooling water flow rate
overall thermal resistance
silicon carbide
