水平蒸发与冷凝结构脉动热管的热力性能

摘要

为解决实际工程应用中平面间的传热问题,文中提出一种水平蒸发与冷凝结构的新型脉动热管,采用数值模拟方法,对该热管在4种加热方式下的启动与热力性能进行了研究分析.结果表明:脉动热管内部存在小气泡、短气塞、长气塞等流型.均匀加热时,该脉动热管的临界启动加热功率为20 W.非对称式(以蒸发段几何中心线为对称轴)与递增式(沿蒸发段端部至绝热段加热量逐渐增加)加热方式均可有效改善脉动热管的启动性能和热力性能,且采用非对称式加热时,可使脉动热管的热阻最多降低13.26％.%To solve the heat transfer between two planes in practical engineering application,a novel pulsating heat pipe (PHP) with horizontal evaporator and condenser structure was proposed.The start-up and thermal performances of proposed PHP were numerically investigated under the condition of four heating ways.The results show that the bubble,vapor plug and long vapor slug pattern exist inside the PHP.The critical start-up input power of present PHP under the condition of uniform heating way is 20 W.The start-up and thermal performance of present PHP can be improved effectively when asymmetric (geometric center line of evaporator section is the axis of symmetry) or incremental (heating power increasing gradually from the evaporator to adiabatic section) way is employed.Furthermore,the results demonstrate thermal resistance can be reduced up to 13.26％ when the asymmetric heating way is applied.