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Considerations on optimum design of micro heat pipe sinks using water as working fluid

机译：关于以水为工作液的微型热管散热器最佳设计的考虑

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摘要

The successful operation of RF wideband gap devices dissipating high levels of heat flux requires effective cooling techniques. One of the most promising thermal management strategies is the use of micro heat pipes (MHP). These devices are very thin profile heat spreaders that can be directly attached to the GaAs or GaN substrate whose function is to allow the spreading of the heat flux almost laterally within a 300 mum thickness. The objective of the work presented was to estimate the convective heat transfer coefficient of a micro-channel heat sink corresponding to a maximum amount of heat removed from heat source placed on the top surface of the sink. This approach taken used an optimal control technique in which the solution of the heat equation is controlled by the convective boundary condition by taking the heat transfer coefficient as the control parameter. A conjugate gradient method was used to solve the optimal control problem. The results show that the temperature distributions corresponding to the controlled solution are lower than those corresponding to the uncontrolled solution. The difference between the controlled and uncontrolled temperatures (4K--10 K) is smaller than in the case of a planar spreader. This suggests that the convective coefficient corresponding to a finned spreader approaches by design an optimum distribution.;The effect of liquid charge on the performance of MHP sinks is important. A too large amount of fluid leads to a condenser flooding, while a too low fluid charge leads to an evaporator dry-out and an increase in channel wall temperature. An iterative scheme was devised to compute the liquid charge corresponding to the maximum heat transport capacity of the pipe.;This study can provide guidance in designing MHP sinks, which have emerged as an effective technique for cooling electronic components.
机译：射频宽带隙设备要成功散发高水平的热通量，就需要有效的冷却技术。最有前途的热管理策略之一是使用微型热管（MHP）。这些器件是非常薄的散热器，可以直接连接到GaAs或GaN衬底，其功能是允许热通量在300微米的厚度内几乎横向散布。提出工作的目的是估计微通道散热器的对流传热系数，该系数对应于从放置在散热器顶部表面上的热源带走的最大热量。这种方法采用了一种最优控制技术，其中，通过将传热系数作为控制参数，通过对流边界条件来控制热方程的解。共轭梯度法被用来解决最优控制问题。结果表明，与受控溶液相对应的温度分布低于与非受控溶液相对应的温度分布。受控温度和非受控温度之间的差异（4K--10 K）小于平面散布器的情况。这表明与翅片式扩压器相对应的对流系数是通过设计最佳分布来实现的。液体电荷对MHP水槽性能的影响很重要。过多的流体会导致冷凝器溢流，而过多的流体电荷会导致蒸发器变干并增加通道壁温度。设计了一个迭代方案来计算与管道最大传热能力相对应的液体电荷。该研究可为设计MHP水槽提供指导，MHP水槽已成为冷却电子组件的有效技术。

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  • 作者

    Simionescu, Florentina.;

  • 作者单位

    Auburn University.;

  • 授予单位 Auburn University.;
  • 学科 Mechanical engineering.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 133 p.
  • 总页数 133
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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