多热源工况下燕尾形轴向槽道热管的热响应特性

Thermal Response of Heat Pipe with Axially Swallow-Tailed Microgrooves for the Application of Multiple Heat Sources

建立了燕尾形轴向槽道热管应用于多热源时的瞬态传热及流动的理论模型并进行了数值求解,研究了该型热管应用于多热源时从启动开始直到达到稳态过程中,壁面温度、弯月面毛细半径、液体速度的实时变化。结果显示:毛细半径沿轴向单调递增;蒸发段有热源与无热源的连接处的温度阶跃变化;在蒸发段热源处,液态工质流速变化激烈,在蒸发段无热源处,液态工作速度变化比较平缓;同时,开展了热管瞬态特性测试实验,实验测量值与数值计算值符合较好。

A theoretical model is developed and analyzed numerically to predict the transient heat transfer and fluid flow of heat pipe with axially swallow-tailed microgrooves subject to heating with multiple heat sources.The real-time variations of wall temperature,capillary radius of curvature and liquid velocity are studied from the initial start to steady state.The numerical results indicate that the capillary radius increases monotonically along the axial direction.The temperature behaves step transition at the junction between the heat source and non-existent heat source on the evaporator.The liquid velocity changes drastically at the evaporator section with the heat source,however,it has slight variation at the evaporator section without heat source.In addition,the verification experiment is conducted,and the present model is verified to be reliable.