【作者】 王啸远； 曾金令； 朱跃钊； 马婷婷； 王银峰；

【Author】 Wang Xiaoyuan;Zeng Jinling;Zhu Yuezhao;Ma Tingting;Wang Yinfeng;School of Mechanical and Power Engineering,Nanjing Tech University;

【机构】 南京工业大学机械与动力工程学院；

【摘要】 将平板热管与管式热管耦合构成高温异型热管(H1SSHP),用于太阳能高温制氢反应器进行集热和传热。通过传热实验考察HTSSHP启动过程组合吸液芯内钠的蒸发传热特性,为其操作和设计优化提供参考。结果表明:HTSSHP启动过程中,吸热面施加输入热流为35370.9W/m2,钠始终为自然对流蒸发传热;输入热流为47161.3W/m2或82532.3W/m2,钠则会由自然对流蒸发转变为膜态沸腾,再转变为较稳定的核态沸腾。钠起始沸腾的汽化核心半径约80μm,钠膜态沸腾期间会导致吸热面壁温脉动,其持续时间在6~35min,脉动幅度在2.5~7.5℃,频率0.5~0.7r/min,输入热流的增大会提高壁温的脉动幅度和频率,但减短其持续时间。更多还原

【Abstract】 The flat plate heat pipe and cylindrical heat pipes are coupled forming a high temperature special-shaped heat pipe(HTSSHP) used in a hydrogen production solar reactor to absorb and transport heat.Experimental investigations were carried out to study the evaporation heat transfer characteristics of sodium in the compound wick in HTSSHP during startup,intending to provide some references for the operation and design optimization of HTSSHP.The results shows that it is dominated by natural convection evaporation heat transfer in sodium at startup for the heat flux of 35370.9W/m2.However,at the input heat flux of 47161.3W/m2 and 82532.3 W/m2,the sodium transforms from natural convection evaporation to film boiling prior to the nucleate boiling.The incipient boiling nucleate radius of sodium in HTSSHP is about 80 u.m.The film boiling can result in a short temperature pulsation on heat absorber surface,and its duration time is of 6-35 min in tests,the pulsation amplitude of 2.5-7.5 ℃,and the frequency of 0.5-0.7r/min.The increase of heat flux will raise the amplitude and frequency of wall temperature pulsation and however decrease its duration time.更多还原