Chen Renkun, Lu Ming-Chang, Srinivasan Vinod, Wang Zhijie, Cho Hyung Hee, Majumdar Arun
Department of Mechanical Engineering, University of California, Berkeley, California 94720, USA.
Nano Lett. 2009 Feb;9(2):548-53. doi: 10.1021/nl8026857.
Boiling is a common mechanism for liquid-vapor phase transition and is widely exploited in power generation and refrigeration devices and systems. The efficacy of boiling heat transfer is characterized by two parameters: (a) heat transfer coefficient (HTC) or the thermal conductance; (b) the critical heat flux (CHF) limit that demarcates the transition from high HTC to very low HTC. While increasing the CHF and the HTC has significant impact on system-level energy efficiency, safety, and cost, their values for water and other heat transfer fluids have essentially remained unchanged for many decades. Here we report that the high surface tension forces offered by liquids in nanowire arrays made of Si and Cu can be exploited to increase both the CHF and the HTC by more than 100%.
沸腾是液-气相转变的一种常见机制，在发电及制冷设备与系统中得到广泛应用。沸腾传热的效能由两个参数表征：(a) 传热系数（HTC）或热导率；(b) 临界热流密度（CHF）极限，它界定了从高HTC到极低HTC的转变。虽然提高CHF和HTC对系统级的能源效率、安全性及成本有重大影响，但水和其他传热流体的这些值几十年来基本保持不变。在此我们报告，由硅和铜制成的纳米线阵列中液体所提供的高表面张力可用于将CHF和HTC均提高100%以上。
Zotero 插件