A CFD model considering the saturation pressure difference inside radially rotating heat pipes (RRHP) was proposed to reveal the heat transfer characteristics. To validate the model, copper-water RRHPs were designed and experimented. These experiments were conducted under equivalent centrifugal accelerations ranging from 100 g to 1500 g, with heat inputs varying from 40 W to 240 W. The centrifugal force has a significant influence on heat transfer in the evaporator, leading to the observed of two different working states in the RRHP: forced convection and pool boiling. An unstable transition state may be observed between these two states. As the rotation speed increased, the occurrence of pool boiling gradually suppressed and the heat transfer performance of the RRHP decreased. At 100 g, the minimum thermal resistance was 0.1792 K/W and at 1500 g the minimum thermal resistance slightly increased to 0.2369 K/W. The numerical results showed demonstrated strong agreement with the experiments, with an overall error below 10 %. Subsequently, a working condition diagram was included to provide a dimensionless description for the RRHP heat transfer behaviours based on the Weber number and Bond number. Finally, the heat transfer performance of RRHP under centrifugal accelerations ranging from 2000 g to 1000 g was simulated. The results indicated that even under 10000 g, RRHP can still maintain the thermal resistance at 0.2527 K/W. And the model can be used to further investigate the potential application of different RRHPs in high-speed rotating machinery.

中文翻译：

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高速径向旋转热管传热性能的实验研究与数值预测


提出了一个考虑径向旋转热管 （RRHP） 内部饱和压力差的 CFD 模型，以揭示传热特性。为了验证该模型，设计并试验了铜水 RRHP。这些实验是在 100 g 至 1500 g 的等效离心加速度下进行的，热输入从 40 W 到 240 W 不等。离心力对蒸发器中的传热有重大影响，导致在 RRHP 中观察到两种不同的工作状态：强制对流和池沸腾。在这两种状态之间可能会观察到不稳定的过渡状态。随着转速的增加，水池沸腾的发生逐渐受到抑制，RRHP的传热性能下降。在 100 g 时，最小热阻为 0.1792 K/W，在 1500 g 时，最小热阻略微增加至 0.2369 K/W。数值结果表明与实验高度一致，总体误差低于 10 %。随后，包括一个工况图，以基于 Weber 数和 Bond 数为 RRHP 传热行为提供无量纲描述。最后，模拟了 RRHP 在 2000 g 至 1000 g 离心加速度下的传热性能。结果表明，即使在 10000 g 以下，RRHP 仍能将热阻保持在 0.2527 K/W。该模型可用于进一步研究不同 RRHPs 在高速旋转机械中的潜在应用。