化工学报2017，Vol.68Issue(12)：4508-4516,9.DOI:10.11949/j.issn.0438-1157.20170638
纳米修饰吸液芯超薄平板热管的传热特性
Heat transfer characteristics of ultra-thin flat heat pipe with nano-modified porous wick
摘要
Abstract
A new type ultra-thin flat heat pipe (UTFHP) with a total thickness of 1.30 mm was prepared by using multiscale composite structures composed of porous layer (PL) and porous wire (PW) as wicks. After chemical modification treatment, the nanostructures modified the surface of the wick, which had super-hydrophilic properties. The thermal performance of UTFHP was investigated with deionized water used as the working fluid. The effects of the nanostructures, filling ratios and inclination angles on thermal properties of UTFHP were analyzed at different heating powers. The results show that the nanostructures can greatly increase the critical heat flux (CHF) and reduce the total thermal resistance of UTFHP when the filling ratio is 25％. Compared with the sample without nano, the CHF is increased by 255％ and the minimum total thermal resistance is reduced by 43.2％ at the horizontal angle. In addition, when the filling ratio is low, the nanostructures can reduce the thermal resistance of condensation in the entire heating power range but increase the thermal resistance of the evaporator because of greater flow resistance at low heating power. But the nanostructures inhibit the heat transfer performance of UTFHP when the filling ratio is relatively high. The inclination angles effectively influence the heat transfer characteristics. When the evaporation section is located directly below the condensation section, the thermal performance of UTFHP is optimal. The unmodified and modified heat pipes both have great heat transfer performance, the maximum heating power is 83.7 and 44.3 W respectively.关键词
超薄平板热管/多尺度/多孔介质/纳米结构/热性能/相平衡/充液比/倾角Key words
ultra-thin flat heat pipe/multiscale/porous media/nanostructure/thermal property/phase equilibria/filling ratio/inclination angle分类
能源科技引用本文复制引用
刘昌泉,尚炜,赵举贵,纪献兵,吴新明,徐进良..纳米修饰吸液芯超薄平板热管的传热特性[J].化工学报,2017,68(12):4508-4516,9.基金项目
国家自然科学基金重点项目(51436004) （51436004）
国家自然科学基金项目(51676071). supported by the Key Program of the National Natural Science Foundation of China (51436004) and the National Natural Science Foundation of China (51676071). （51676071）
