高功率脉动热管的流动和传热特性

在毛细滞后阻力方面,改进了所建立的高功率脉动热管的模型,进一步研究了脉动热管的流动和传热特性.根据控制体进出口液体容积流率的变化和流型的环状流特点,提出了确定毛细滞后阻力的新方法,关联了脉动热管的充液率、传递的功率大小、流速等参数之间的耦合关系,从而进一步说明了显热和潜热贡献的转换关系和传热特性.结果表明,工质的流速主要受毛细管管径、加热段的热流密度、传递的功率大小等影响较大,受毛细管长度的影响较小;总传热量中显热传热量仍占大部分.

HEAT TRANSFER AND FLOW ON HIGH POWER PULSATING HEAT PIPE

On the resistance of capillary hysteresis,the model of high power pulsating heat pipe is improved and the flow and heat transfer are further studied.By the liquid volume rate variation of the control volume and the circular pattern flow,the capillary hysteresis resistance is related with the filling rate,the transferred power and the flow velocity of the working fluid etc..The transferred ratio of latent heat and sensible heat and heat transfer are illustrated further.The results show that the velocity of the working fluid is influenced by the capillary diameter,heat flux of the heating section and the transferred power etc.,and the capillary length has less significance effect.Of the total transfer power,the sensible heat dominates compared with that of latent heat.