Supercapillary Architecture-Activated Two-Phase Boundary Layer Structures for Highly Stable and Efficient Flow Boiling Heat Transfer
Supercapillary Architecture-Activated Two-Phase Boundary Layer Structures for Highly Stable and Efficient Flow Boiling Heat Transfer
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DOI：
10.1002/adma.201905117
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发表时间：
2019-11-11
影响因子：
29.4
通讯作者：
Li, Chen
中科院分区：
文献类型：
--
作者：
Li, Wenming;Wang, Zuankai;Li, Chen
更小、更快、更强大的电子设备的发展需要有效的冷却策略来有效地去除越来越多的热量。相变换热以其高效的传热方式在各种水能工业中得到了广泛的应用。尽管取得了广泛的进展，但由于多相流的高度过渡性和混沌性以及不利的边界层结构，实现流动沸腾的物理极限仍然具有挑战性。在这里，一个新的策略，承诺接近流动沸腾传热的物理极限的报告。具有多个通道的流动沸腾装置的特征在于微扰流栅的设计，该微扰流栅从根本上改变了边界层结构，并且即使在高热通量条件下也赋予显著更高的传热系数，在高热通量条件下，沸腾传热通常由于从出口区域开始的干涸和严重的两相流不稳定性的发展而恶化。而且，在不增加压降的情况下实现了物理极限的接近。
Development of smaller, faster, and more powerful electronic devices requires effective cooling strategies to efficiently remove ever-greater heat. Phase-change heat transfer such as boiling and evaporation has been widely exploited in various water-energy industries owing to its efficient heat transfer mode. Despite extensive progress, it remains challenging to achieve the physical limit of flow boiling due to highly transitional and chaotic nature of multiphase flows as well as unfavorable boundary layer structures. Herein, a new strategy that promises to approach the physical limit of flow boiling heat transfer is reported. The flow boiling device with multiple channels is characterized with the design of micropinfin fences, which fundamentally transforms the boundary layer structures and imparts significantly higher heat transfer coefficient even at high heat flux conditions, in which boiling heat transfer is usually deteriorated due to the development of dryout starting from outlet regions and severe two-phase flow instabilities. Moreover, the approaching of physical limit is achieved without elevating pressure drop.