VISUALIZATION EXPERIMENTAL ON THE EVAPORATION CHARACTERISTIC IN A NANOPARTICLE-LADEN MESH WICK OF OPERATING HEAT PIPE
In this study, visualization experiments are conducted on horizontal flat-plate heat pipes to investigate the thermal effects of the nanoparticles laden in the evaporator wick.The heat pipe wick is a two-layer 100 + 200 mesh copper wick sintered on a 4 mm-thick copper base plate.Two kinds of nanoparticles, Al203 and Cu, are laden in the evaporator wick.The former are filled together with de-ionized water;the latter are weakly sintered on the wick surface before water filling.While the steady-state evaporation process is visualized through the upper glass plate of the heat pipe, the evaporator resistances are measured simultaneously.During heat pipe operation, the nanoparticle-laden evaporator appears quiescent with no sign of nucleate boiling.The evaporator resistance reduces with increasing heat load until local dryout occurs in the evaporator.These characteristics are similar to those observed without nanoparticles.However, with nanoparticles the minimum evaporator resistances are reduced by about 20%.The maximum heat loads are increased with a higher improvement as large as 20% for a larger amount of nanoparticles.The reasons for these improvements may be attributed to the additional heat paths and capillarity offered by the nanoparticle agglomerates.
Heat pipe mesh wick nanofluids nanoparticles evaporator resistance
Shwin-Chung Wong Ya-Chi Ho Hsin-Chu Taiwan,ROC
Department of Power Mechanical Engineering, National Tsing Hua University
国际会议
The 11th International Heat Pipe Symposium(第十一届国际热管研讨会)
北京
英文
87-91
2013-06-09（万方平台首次上网日期，不代表论文的发表时间）