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首页> 外文期刊>International Journal of Heat and Mass Transfer >Oscillating heat pipe simulation considering bubble generation Part I: Presentation of the model and effects of a bubble generation
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Oscillating heat pipe simulation considering bubble generation Part I: Presentation of the model and effects of a bubble generation

机译：考虑气泡产生的振荡热管模拟第一部分：气泡产生的模型和效果的介绍

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摘要

Oscillating heat pipe (OHP) simulations with and without a bubble generation are performed to investigate both the flow behaviors of liquid slugs, vapor plugs and liquid films, and the heat transfer characteristic of an OHP. A closed-looped OHP without an adiabatic section is adopted. The simulations are performed under the boundary condition of constant wall temperature. The results show that a bubble generation causes the large pressure difference between two neighboring vapor plugs (driving force). This produces oscillating motions of liquid slugs and vapor plugs with large amplitude, which are very different from all previous simulation results (only a simple sinusoidal oscillating motion with small amplitude). The frequency of oscillating motions also increases due to the continuous bubble generation. By the large amplitude and the more frequent of oscillating motions, the amount of latent and sensible heat transfer rates from the heating section to the cooling section increase. The latent heat transfer rate increases due to the large evaporation rate from liquid film during a bubble growth, while the sensible heat transfer rate increases due to the large amplitude motions of liquid slugs and vapor plugs. In the simulation with a bubble generation, heat is transferred by the sensible heat (74%) and latent heat (26%). On the other hand, in the simulation without a bubble generation, heat is transferred mainly by the sensible heat (95%) and only 5% by the latent heat, which agrees with the previous simulation results.
机译：进行带有和不带有气泡产生的振荡热管（OHP）模拟，以研究液团，蒸气塞和液膜的流动行为，以及OHP的传热特性。采用无绝热段的闭环OHP。模拟是在恒定壁温的边界条件下进行的。结果表明，气泡的产生引起两个相邻蒸气塞之间的大压力差（驱动力）。这会产生大幅度的液塞和蒸气塞的振荡运动，这与以前的所有模拟结果都大不相同（仅是一个小幅度的简单正弦振荡运动）。振荡运动的频率也由于连续气泡的产生而增加。通过较大的振幅和更频繁的振荡运动，从加热部分到冷却部分的潜热和显热传递率的数量增加。潜热传递速率由于气泡生长过程中从液膜中蒸发的速率较大而增加，而显热传递速率由于液塞和蒸气塞的幅度较大的运动而增大。在产生气泡的模拟中，显热（74％）和潜热（26％）传递热量。另一方面，在不产生气泡的模拟中，主要通过显热（95％）传递热量，而通过潜热仅传递5％，这与之前的模拟结果一致。

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