摘要
建立了脉动热管的可视化实验台,对以体积分数为1%的TiO2/H2O和CuO/H2O纳米流体及基流体为工质、55%充液率的脉动热管性能进行了实验研究.结果表明,工质静止时,纳米颗粒在脉动热管中会发生沉淀,但工质的运动能够使沉淀纳米颗粒再次悬浮;随着温度的升高,纳米颗粒的悬浮稳定性减弱;与基流体工质相比,纳米流体脉动热管的最小启动功率低,启动时间较短,工作温度低,传热热阻小,温度波动振幅小、频率高;纳米流体能大幅提高脉动热管的传热性能,工作温度为110℃时,蒸馏水、TiO2/H2O及CuO/H2O脉动热管的传热热阻分别为0.23℃/W、0.11℃/W和0.13℃/W;两种纳米流体脉动热管的传热性能接近.
Visualization experimental investigation of pulsating heat pipes （PHP） was conducted. A PHP was charged with distilled water, TiO2/H2O nanofluid and CuO/H2O nanofluid as working fluids by a filling ratio of 55 %, respectively. Both the nanofluids were made of distilled water and 1% volume fraction of nanoparticles. Experimental results showed that nanoparticles settled down in the motionless base liquid, but the oscillating motion in PHP would excite them to suspend. The suspending stability of nanofluid got weak as temperature increased. Compared with the distilled water PHP, nanofluid PHP could work in lower heat loads, and had shorter startup time, lower thermal resistance, and temperature oscillation of smaller amplitude and higher frequency. At the working temperature of 110℃, the thermal resistance of PHP was 0.23℃/W, when it was filled with distilled water, and the thermal resistance would decrease to 0.11 ℃/W or 0.13 ℃/W, when it was charged with TiO2/H2O or CuO/H2O. The two nanofluid PHPs had similar heat transfer oerformance.
出处
《中国科学院研究生院学报》
CAS
CSCD
北大核心
2009年第1期50-57,共8页
Journal of the Graduate School of the Chinese Academy of Sciences
基金
国家自然科学基金(50676096)资助
关键词
脉动热管
纳米流体
悬浮稳定性
启动
传热
pulsating heat pipe（PHP）, nanofluid, suspending, startup, heat transfer performance
