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首页> 外文期刊>International Journal of Heat and Mass Transfer >Nonlinear thermomechanical finite-element modeling, analysis and characterization of multi-turn oscillating heat pipes
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Nonlinear thermomechanical finite-element modeling, analysis and characterization of multi-turn oscillating heat pipes

机译：多圈振荡热管的非线性热力学有限元建模，分析与表征

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Oscillating heat pipes (OHPs) are promising heat dissipation devices for modern electronic systems due to their high heat transfer rate, simple construction and low manufacturing cost. Despite the unique features of OHPs, how to initiate and sustain the slug flow within the capillary tube and how different parameters affect the performance of an OHP are not well understood. This paper presents an advanced, fully nonlinear thermomechanical finite-element model that can simulate the parametrically excited oscillation of the liquid slug, the temperature distribution along the two-phase flow and the heat transfer performance of OHPs. The model can account for the influences of nonlinear spring effect of vapor slugs, interphase mass-transferring effect, fluid filling ratio, operating temperatures of the evaporator and condenser, different heating modes (top- or bottom-heating), gravity, bending pressure loss, properties of the working fluid, and different random distributions of initial velocities and lengths of fluid slugs. An Euler predictor-corrector method with convergence check is used to solve for the oscillation of and the temperature distribution within each fluid plug. The dynamics of OHPs is characterized using a newly developed time-frequency analysis technique. Numerical results show that an OHP is a parametrically excited nonlinear thermomechanical system. Latent heat transfer provides the driving force for the oscillation, and sensible heat transfer induced by forced convection contributes more than 80% of the total heat transfer rate. Generally speaking, working fluids with high thermal conductivity, low latent heat, and low viscosity are favorable for efficient heat transfer. These results provide better understanding of heat transfer mechanisms of OHPs and can be used for design optimization of OHPs.
机译：振荡热管（OHP）具有很高的传热速率，简单的结构和较低的制造成本，是现代电子系统中有希望的散热设备。尽管OHP具有独特的功能，但如何在毛细管中引发和维持团状流以及不同的参数如何影响OHP的性能却知之甚少。本文提出了一种先进的，完全非线性的热机械有限元模型，该模型可以模拟液团的参数激发振动，沿两相流的温度分布以及OHP的传热性能。该模型可以说明蒸汽段塞的非线性弹簧效应，相间传质效应，流体填充率，蒸发器和冷凝器的工作温度，不同的加热方式（顶部或底部加热），重力，弯曲压力损失的影响。 ，工作流体的特性以及初始速度和流体块长度的不同随机分布。使用具有收敛性检查的Euler预测器-校正器方法来解决每个流体塞的振荡和温度分布。 OHP的动力学特性是使用最新开发的时频分析技术来表征的。数值结果表明，OHP是一个参量激发的非线性热机械系统。潜热传递提供了振荡的驱动力，强制对流引起的显热传递占总热传递率的80％以上。一般而言，具有高导热率，低潜热和低粘度的工作流体有利于有效的热传递。这些结果可更好地理解OHP的传热机理，并可用于OHP的设计优化。

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