环路型脉动热管的稳态运行机制

建立了环路型脉动热管稳态自激循环流动运行机制的物理模型和数学模型。潜热传递决定了运行的驱动力和循环流动的速度;显热传递和循环流动速度决定了净换热量的大小。通过关联加热段和冷却段的传热、进出口汽液容积流率、密度、运行驱动力和阻力,对传热和流动进行了耦合求解。结果表明,潜热传热量占总传热量的比例在30％以内;工质循环流动的速度决定了壁面温度波动,温度波动取决于显热传热和循环流动速度。

STEADY STATE OPERATIONAL MECHANISM OF LOOPED PULSATING HEAT PIPE

The model of operational mechanism is established to describe the steady state self-excited circulation flow of looped pulsating heat pipe (PHP). The operational driving force is provided by pressure difference of the latent heat transfer between the heating section and the cooling section, it balances the total flow resistances, and they determine the circulation flow velocity. While the sensible heat transfer and flow velocity contribute to the most heat transfer amount. Several important parameters are correlated and solved, including the heat transfers of heating section and cooling section, volume flow rates of inlet and outlet of heating and cooling sections, densities, operational driving forces and flow resistances etc.. The results demonstrate that the ratio of latent heat transfer to sensible heat transfer is within 30 percent. The temperature oscillation of PHP wall depends on the sensible heat transfer and the circulation flow velocity of the vapor bubbles and liquid plugs.