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首页> 外文期刊>Journal of Heat Transfer >Mathematical Modeling of Novel Two-Phase Heat Transfer Device for Thermal Management of Light Emitting Diodes
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Mathematical Modeling of Novel Two-Phase Heat Transfer Device for Thermal Management of Light Emitting Diodes

机译：用于发光二极管热管理的新型两相传热装置的数学建模

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The paper introduces a novel two-phase heat transfer device (TPHTD) which is employed in the thermal management of light emitting diodes (LEDs). The heat transfer device structurally resembles a conventional loop heat pipe (LHP) without a compensation chamber, but operates very differently from it. The device is comprised of a central evaporator package and a circular coil that acts as a heat exchanger loop. The working fluid leaving the evaporator has a two-phase mixture quality of approximately 0.2. Having introduced the device, the paper delineates a mathematical model for predicting its thermal performance. The primary objective of the model is to provide a fundamental understanding of the operation of the device. A one-dimensional thermal resistance model (TRM) is utilized in modeling the evaporator. The paper presents a detailed discussion on obtaining these resistances from experiments conducted on the device. A correlation for the external heat transfer coefficient of the heat exchanger loop is proposed based on experiments and is found to be in good agreement with literature. The model predicts performance parameters such as board temperature, two-phase mixture quality, and saturation and subcooled temperatures (T_sat and T_sc) of the working fluid for different input thermal powers (Q_tot). Based on experimental evidence, it is concluded that the majority of Q_tot (~75%) is utilized in phase change of the working fluid, and the rest reheats the working fluid from a lower subcooled temverature (T_sc) to the saturation temperature (T_sat) of the evaporator.
机译：本文介绍了一种新型的两相传热装置（TPHTD），该装置用于发光二极管（LED）的热管理。传热装置在结构上类似于不带补偿室的常规回路热管（LHP），但其运行方式却大不相同。该设备由一个中央蒸发器组件和一个用作热交换器回路的圆形盘管组成。离开蒸发器的工作流体的两相混合物质量约为0.2。引入该器件后，本文描述了一个预测其热性能的数学模型。该模型的主要目的是提供对设备操作的基本了解。一维热阻模型（TRM）用于对蒸发器进行建模。本文提出了有关从器件上进行的实验中获得这些电阻的详细讨论。根据实验提出了换热器回路外部传热系数的相关性，发现与文献有很好的一致性。该模型可预测性能参数，例如板温度，两相混合物质量以及针对不同输入热功率（Q_tot）的工作流体的饱和度和过冷温度（T_sat和T_sc）。根据实验证据，可以得出结论：大部分Q_tot（〜75％）用于工作流体的相变，其余Q_tot将工作流体从较低的过冷温度（T_sc）再加热到饱和温度（T_sat）蒸发器的

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