【摘要】 本文在实验的基础上,对碳钢-萘热管的传热性能等进行了研究.在加热段内,管内的沸腾传热过程随热负荷的变化大致可分为三个区域,即以自然对流为主的沸腾区、核化沸腾区和传热恶化区,加热段的沸腾传热热阻随其径向热流密度的变化而改变.文章叙述了,在外界工况改变的情况下,萘热管内传热热阻的变化规律.本文用流体力学和边界层理论对重力式热管冷凝回流液的流动特性进行了分析,对液膜成膜厚度和膜内速度分布进行了论述,认为,在液膜较薄的区域,液膜流动特性较差,最容易造成液膜破断,发生局部传热恶化.在分析讨论中,就萘热管的某些传热特性和水热管进行了对比.更多还原

【Abstract】 Based on experiments, this paper studied the heat transfer characteristics of the carbon-steel/naphthaline heat pipe. In the evaporator section, the boiling heat transfer process inside can be divided into three parts, boiling region mainly based on the free convection, nucleate boiling region and heat transfer crisis region. The thermal resistance of the evaporator heat transfer varies with the change of the redial heat flux. The paper expressed the regularity of the resistance change of the naphthaline heat pipe with the change of outside conditions. By means of fluid mechanics and the theorem of boundary layer, this paper analysed the flow characteristics of the condensation falling liquid of the graviation heat pipes, and discussed the thickness of forming film and distribution of the velocity in the film.更多还原