【摘要】 在普通热管的工质(水)中分别加入ZnO,SiO2,Al2O3和TiO2纳米粉制成了4根新型热管与1根普通热管,共5根热管,均由铜管制成,长度为800 mm,外径12 mm,内径为10 mm,加入水10 mL.在相同的实验条件下研究了这5根热管的启动性能、管壁温度以及输出热量,并对其物理机理进行了探讨,得出如下结论:新型热管比普通热管启动速度快,管壁温度低,换热性能好;加入的纳米粉的尺寸越小,热管的换热性能越好;在一定范围内,纳米粉加入的量越多,热管换热性能越好,但是超过一定量后,会使热管换热性能变差.更多还原

【Abstract】 The heat pipes′ start performance,wall temperature and heat output and their physical mechanisms were studied.The five copper heat pipes,with the same long of 800mm,internal diameter of 10mm and water of 10mL,were tested under the same experimental conditions,one of which is traditional heat pipe;other four of which,their working matters(water) begin added ZnO,SiO2,Al2O3 and TiO2 nanoparticles respectively,are new-type of heat pipes.The experiment results showed that: a.the temperature of the new-type of heat pipes rise more quickly than the traditional one;b.the wall temperatures of the new-type of heat pipes are lower than the traditional one;c.the performance of the new-type heat pipes are superior to that of the traditional one;d.the smaller the sizes of the nanoparticles are,the better their heat transfer performances are;e.under a certain quantity,the more the nanoparticles are added,the better their heat transfer performances are.更多还原