Abstract We introduce a new figure of merit to judge the performance of two-phase capillary cooling devices working on thin film evaporation. This quantity is the heat transfer coefficient of the film thickness where the liquid pressure is zero, and represents its maximum attainable value in the thin film region. It shows good agreement with four different sources of data: data from the literature, maximum heat flux limit, interline heat flow parameter and heat pipe figure of merit, for different working fluids and a wide range of saturation temperatures. The proposed quantity is very simple, requires minimal computation, and can be used to compare the performance of different working fluids for such devices.

中文翻译：

---

利用薄膜蒸发的器件的简单品质因数

摘要 我们引入了一种新的品质因数来判断用于薄膜蒸发的两相毛细管冷却装置的性能。该量是液体压力为零时膜厚的传热系数，代表其在薄膜区域的最大可达到值。它与四种不同的数据来源显示出良好的一致性：来自文献的数据、最大热通量限制、线间热流参数和热管品质因数，适用于不同的工作流体和各种饱和温度。建议的数量非常简单，需要最少的计算，可用于比较此类设备的不同工作流体的性能。